Zx spectrum ula heatsink. Search; Spectrum +48 Oddities.

Zx spectrum ula heatsink Note: There is not enough room for a heatsink in the rubber-keyed Spectrum unless you desolder the ULA's IC socket and fit the ULA directly onto the motherboard. All topics are explained in simple yet precise terms, building on their careful introduction towards the full Sinclair ZX Spectrum. Sinclair ZX Spectrum. Just a brief story: I had an old zx spectrum with a destroyed PCB, so I have bought a new PCB on ebay, bought all new components, resistors and capacitors and Transistors, and all new ICs except from ULA, and ROM (which I also tried to replace with an EPROM, modifying the PCB with the BAT85 10k resistor etc, all things you already know At the end of the last article, 'Simple Start To Retrofitting A ZX81', a new power supply was sourced and a composite video mod was fitted. 986 likes · 3 talking about this. ZX Spectrum 128K ULA replacement. Although I said some add-ons need a bit more than 9v, do NOT be tempted to try the 12v setting as it is as this will probably cause the zx81 regulator to overheat, and maybe kill your add-ons, unless you wire in 1 or 2 3amp diodes , 1N5401 or similar, in series with the power supply! The Sinclair ZX Spectrum was launched in 1982 by Sinclair Research Limited, and what looked like a dead cockroach connected by various wires inside to overcome problems with its early ULA. Sockets. #2: Replace the voltage regulator: From the factory, the ZX Spectrum uses a 7805 linear regulator (attached to the large heatsink at the top of the board) to regulate the 9Vdc input voltage to 5Vdc. Comes with a silicone heat pad for easy application. Discussion forums for users of the Sinclair 8-bit range of computers - ZX80, ZX81, ZX Spectrum, Z88, clones It's normal for the heatsink for the 7805 to run hot. 3V with lots of ripple BELOW: ULA pin 38 and Z80 pin 19 look the same: ULA pin 38 below: Z80 pin 19 BELOW: ULA pin 3 Below: ULA pin 2 showing high at 3. Thankfully the Spectrum has a common ground and it turns out the heatsink is grounded, so that problem was solved fairly quickly. The current used depends of the version of the ULA, the manufacturer of the RAM etc, but is around 650mA. Then to the Z80 CPU (IC2) pin 6. 5g 1x cleaning cloth for heatsink Heatsink dimensions: approx. It had a larger case with a better keyboard. Their email address is rcs-sales@hotmail. It represented a radical departure from the earlier versions, with a redesigned circuit board, an uprated buzzer added to make the BEEP louder and a new low-power ULA introduced. Otherwise, the chips are all pretty much the same. Improve this answer. It can be implemented as a plug-in replacement for the ULA such as SLAM+, an external interface such as ZXHD or MB03+, in The ULA (Uncommitted Logic Array) is a chip which controls most of the interfaces between the Z80 CPU and peripheral functions. There are few peculiarities on the board: big cooler on ULA, unusual spider mod and something that looks like extra audio output. First problem was to find a good ground connection for connecting the crocodile clip of my probes too. Sinclair ZX80 / ZX81 / Z88 Forums. just above the heatsink there were two large black electrolytic capacitors, and solder pads specially for them (which are not present on the issue one board), and the other electrolytic capacitors that are usually found dotted around the issue one board were missing The monochrome (Y) part of the video from the ULA comes out on pin 17. RetroTechie wrote:ZX81 and TS1000 are the same machine hardware-wise, so result for that TS1000 'hacked' to run @50 Hz is an odd oneRemaining variables that might have effect: ROM, and DFILE expanded or not (1K, 2K or 16K RAM). Power on and check visual Run diagnostic ROM, perform soak test, load and run a game. After I did the 32K RAM upgrade (see below) I measured ~270mA at full load, well within the range of a typical USB device. Perhaps that 'hacked' TS1000 had an older ROM version or something. 99 which supposedly drop the typical operating temperature of the ULA from 63 degrees celcius down to 50 degress celcius. I thought I’d start off with a Sinclair ZX80 / ZX81 / Z88 Forums. 5 posts • Page 1 of 1. 6 by Arjun Nair. payty Dizzy Posts: 67 Joined: Mon Nov 11, 2019 3:57 pm. Rich Mellor RWAP Software RWAP Adventures SellMyRetro Retro-Printer Module Also Involved in: ↳ ZX Spectrum Lounge; ↳ Hardware; ↳ Software; ↳ Spectrum BASIC; Z88; Board index; All times are UTC+01:00; A Sinclair ZX Spectrum Community Site. Heatsink for ULA Sinclair ZX Spectrum 48K+ Dimensions: 50 mm x 19 mm x 5 mm Heatsink is not self-adhesive SellMyRetro - Trading Site for Retro & Vintage Computers. The ULA also runs hot. Test pins 14, 15 and 16 on IC14 (LM1889) for So after spending some time moving components between boards I can now get the original ZX Spectrum booting as a 16K with the following: In your very first post you said "I have checked the ULA and Z80 in another Spectrum and they seem fine,". KeplerOfMars Drutt Posts: 47 Joined: Mon Jun 26, 2023 The ZX Spectrum +2. The Issue 3 was the most widely available of all Spectrum versions, with over 3,000,000 sold. The book is the result of opening the chip and reverse-engineering it down to the transistor level. Issue 2 PCB’s contain probably the widest variety of ULA types – very early It would actually be better to mount the ula on top of a heatsink rather than mounting a heatsink on top of a ula (or both ). Search; Spectrum +48 Oddities. Discussion forums for users of the Sinclair 8-bit range of computers - ZX80, ZX81, ZX Spectrum, Z88, clones ULA pin12 is pretty hard to get a clear image of BELOW: ULA pin 33 Showing high at 3. Discussion forums for users of the Sinclair 8-bit range of computers - ZX80, ZX81, ZX Spectrum, Z88, clones Even a regulated 9v power pack will make the heat sink overly hot,however using a regulated 7. Anyway, they were fitted with heatsinks as manufactured. This is a Spectrum Plus, but it is the same board as used in the original rubber keyed ZX Spectrum. Discussion forums for users of the Sinclair 8-bit range of computers - ZX80, ZX81, ZX Spectrum, Z88, clones Main differences are the ULA they commonly come with. Considering that most of the Sinclair supplies state a voltage output of 9V (but is actually closer to 12V), the power dissipation of the 7805 is close to 4 ZX Spectrum 128K ULA replacement. RWAP Posts: 1349 Joined: Thu May 08, 2008 8:42 am Location: Stoke-on-Trent, UK ZX Spectrum ULA. This information supersedes all existing versions of the specification, including ULA heatsink: Heatsink for ULA with thermal compound adhesive already fixed and ready to be installed. 0-0. 1024MAK Bugaboo Please note that at no point am I telling people not to fit a heatsink to a ULA. ↳ ZX Spectrum Lounge; ↳ Hardware; ↳ Software; ↳ Spectrum BASIC; Z88; Board index; All times are UTC+ If we’re talking about the original 48K Spectrum (and, to a degree, the Spectrum+/128K), replacing the original PSU with a 9V regulated switch-mode PSU will help a great deal more. sl07h1 wrote: ↑ Wed Mar 03, 2021 4:09 am Hi guys, I have a ZX81 that have an old ULA (ULA2C184E) and I have problems connecting it to all TV sets I have, I get a very dark, blurry and noisey image, you can barely see something turning the bright all the way up. Moggy Posts: 3438 Sinclair ZX Spectrum; ↳ ZX Spectrum Lounge; ↳ Hardware; ↳ Software; ↳ Spectrum BASIC; Z88; Board index; All times are UTC+01:00; Sinclair ZX80 / ZX81 / Z88 Forums. Discussion forums for users of the Sinclair 8-bit range of computers - ZX80, ZX81, ZX Spectrum, Z88, clones Other flavours of ZX81 I've got are Issue 1's with 2C158E ULA, same with a kludge on the CPU to fix a bug in the ROM and an Issue 1 with a creamy coloured PCB. In the 48K Speccy, it’s mounted to a heatsink Sinclair ZX80 / ZX81 / Z88 Forums. pndc pndc. co. Interface developers have found it hard to come up with designs that can cope with the various different levels that the clock signal has on the different ZX Spectrum versions. It is designed for maximum compatibility with existing software. I can also see the heatsink. Heatsinks are the biggest difference and the color video section changes also. It can be implemented as a plug-in replacement for the ULA, in emulators, or in modern hardware such as the ZX Spectrum Vega. In the 48K Speccy, it’s mounted to a heatsink Front photo: a completely refurbished ZX Spectrum 48K issue 2 board, with all capacitors replaced, heatsink on ULA chip with ULA socket removed to make it still fit into a rubber-key case, and very power efficient Traco Power DC-DC voltage regulator instead of the 7805 regulator that becomes very hot. Home; Features; Advice; Technical; A brief search located the remains, hiding in the recess between the regulator and the heatsink: (seen here just left of the ULA) for a 1K5 resistor, which helps better balance the AY and beeper levels. The second case is that of the VideoProc ULA used in the Acorn BBC Micro. 2 posts • Page 1 of 1. Issue 2 PCB’s contain probably the widest variety of ULA types – very early Heatsink for 40 Pin DIL Chips - Bare. The ZX81 used one, and the Spectrum used a different one; The SCL Chip is designed around a Universal Logic Array (ULA) made by Ferranti. It is folded such that it is just above the In the ZX Spectrum (16K and 48K machines) the memory map is as follows: Memory Map. 50 mm x 19 mm x 5 mm SellMyRetro - Trading Site for Retro & Vintage Computers. 5g 1x Swab for cleaning Size of the Heatsink: ca. Contribute to freecores/zx_ula development by creating an account on GitHub. The best solution is to replace all with new RAM's which must all be of the same type. The big lump of metal at the top is the heatsink. Discussion forums for users of the Sinclair 8-bit range of computers - ZX80, ZX81, ZX Spectrum, Z88, clones Heatsink: Rare Only if 7805 is used. The ONLY proper solution to extend the life of an original ULA chip is to put a heatsink on it with the size of the chip itself. My Settings: Search. Top. The ZX Spectrum 16K/48K ULA went through multiple revisions and is either a 5C or 6C series Ferranti ULA. ZX Spectrum 48k displays correct image over composite video. ZX Spectrum ULA. Discussion forums for users of the Sinclair 8-bit range of computers - ZX80, ZX81, ZX Spectrum, Z88, clones ZX Spectrum 128K ULA replacement. The first version of the Ferranti VideoProc ULA as used in the BBC Micro (which has a design error, hence needs a heatsink). I recently dusted off my ZX Spectrum, which my father bought me and smuggled to Eastern Europe in the first half of the 1980s. In the 48K Speccy, it’s mounted to a heatsink Purchase Sinclair ZX Spectrum 48K+ ULA Heatsink from 8BitRetro. Post by payty » Wed Apr 07, 2021 4:58 am. Post Reply. The ULA chip uses the same pin (28) for all of the MIC socket, EAR socket and the internal speaker, so bits 3 and 4 of an OUT to Port 0xfe will affect bit 6 as read by an IN from Port 0xfe. It was designed by myself, Phil Ruston (PCB design, mostly) and Alessandro Dorigatti (logic core) Diagnostic Test ROM for Spectrum 16/48. upgraded the ZX Spectrum, the new version was the ZX Spectrum+ with 48K bytes of RAM. USB Power: the dapper ZX81 gets a little warm with that small heatsinked 7805 and a busy ULA. However the signals are within specification to work. 5g 1x heatsink cleaning cloth Dimensions heat sink: approx. Cheers Sinclair ZX Spectrum. The ZX Spectrum +2A, +3, ZX80 ZX81 iss 1 (bugged ROM, kludge fix, normal, rebuilt) TS 1000 iss 3, ZXPand AY and +, ZX8-CCB, ZX-KDLX & ChromaSCART Tatung 81 + Wespi TS 1500 & 2000 The easiest way to get these parts is to buy an old or broken ZX Spectrum, and salvage them. Secondary winding (connected to the transistor base) 0. Heatsink for 40 Pin DIL Chips - Bare. First, the different issue ULAs produce different amounts of heat. 49 and heatsinks for £3. Leave the heatsink off for now ZX Spectrum 48K issue 2 boards require manual trimming of some video output parts. The Z80 CPU when running, runs warm. You can build am Issue 3 with all new chips, and just move the ULA across - that ZX Spectrum 3B all finished, Heatsink on the ULA, Cased and playing Manic Miner. If we’re talking about the original 48K Spectrum (and, to a degree, the Spectrum+/128K), replacing the original PSU with a 9V regulated switch-mode PSU will help a great deal more. The ZX Spectrum ULA: How to design a microcomputer; The heatsink for the Sinclair is rather heavy and takes up a lot of space which is no surprise when the current draw is around 650mA. For example a bugfixed ROM might affect The ULAplus specification describes an enhanced ULA for the ZX Spectrum. net. 6. ZX Spectrum 48K Issue 3B Bill of Material, Version: 1. My Settings: ZX Spectrum 4 version 1. 3636, build 23465 by Tim Butler and Richard Butler. That is up to each individual to decide for themselves. 5MHz Is there a way to identify the board version of a ZX Spectrum that doesn't involve having to open it? It has a yellow 48K sticker underneath and serial number: 035-202763 in red by the expansion port. ULA: Instead of the original ULA, you can use modern replicas like Retroleum Nebula or vRetro vLA82. IC heatsink kit for ZX Spectrum 48K ULA Scope of delivery: 1x heatsink for ZX Spectrum 48K ULA 1x tube of thermal adhesive approx. 2 (2024-04-19) Source at GitHub – License: GNU General Public License (GPLv3) If we’re talking about the original 48K Spectrum (and, to a degree, the Spectrum+/128K), replacing the original PSU with a 9V regulated switch-mode PSU will help a great deal more. KeplerOfMars Drutt Posts: 45 Joined: Mon Jun 26, 2023 The audio output from the ZX Spectrum +2 will need to be amplified if you are going to use headphones. ULA Pin Assignments ULA Operation The ULA takes the 14MHz master clock feed on pin 39 (Q) from the crystal oscillator and divides that by 2 to provide a more stable 7MHz clock for the video pixel clock, then again to provide a 3. Don't let Moggy know but try a heatsink on the ULA BTW which composite mod did you do? Andy. This means it could easily emulate the ULA chip with all its inputs and outputs, significantly reducing the cost compared to FPGA-based solutions. 21 ohms. Notes on Connections CPU Clock. 50 mm x 19 mm x 5 mm Sinclair ZX Spectrum 16K / 48K / 48K+ / 128K+ ULA Heatsink Dimensions: 50 mm x 19 mm x 5 mm Heatsink is not self-adhesive Requires either a thermal adhesive pad or thermally Find many great new & used options and get the best deals for ZX Spectrum 40 PIN Heatsink for ULA or CPU - With thermal tape at the best online prices at eBay! Free shipping for many IC heatsink kit for ZX Spectrum 48K ULA Scope of delivery: 1x heatsink for ZX Spectrum 48K ULA 1x tube of thermal adhesive approx. A Sinclair ZX Spectrum Community Site. My Settings: So i am not seeing any clock from pin 39 of the ULA (as I am comparing to a working spectrum) The known good: ULA is a new SLAM module fitted in the socket (continuity checks to from the module to the board ok) New EPROM fitted TR3 & TR6 removed, checked and put back, both matched In a U. 7 posts • Page 1 of 1. Only the composite video (on the RGB/monitor DIN socket) and the TV UHF outputs need the +12V for the TV audio to work (it is combined with the video signal hence the need for the +12V to be working). Discussion forums for users of the Sinclair 8-bit range of computers - ZX80, ZX81, ZX Spectrum, Z88, clones Finally got around to powering up the motherboard this morning and have done a preliminary check of the board. The early types ran hot. It is an extension to the original Spectrum ULA specification and has now become a widely adopted hardware modification that features 64 colour output from a 256 colour palette and is supported But the edge-connector signal comes from the ULA, not the transistor. You might have fried part of the ULA. What you need to know, is which bits in the byte are failing (if it is a DRAM chip or chips) that are actually failing. In the 48K Speccy, it’s mounted to a heatsink If we’re talking about the original 48K Spectrum (and, to a degree, the Spectrum+/128K), replacing the original PSU with a 9V regulated switch-mode PSU will help a great deal more. Delivery: 1x Heatsink for ZX Spectrum 48K ULA 1x Tube Thermal Glue ca. 1: Coil: Rare: 2: MCPU, ULA: DIP40: IC1, IC2: M are links to example components at Mouser Electronics. Essentially the same as Switchable ROM Module (below), but supplied as standard with two different diagnostic programs installed (selected via a switch): Retroleum DiagROM and Brendan ULA is a type of customizable chip used in many different devices back in the 1970s and 1980s; SCL is the Sinclair Computer Logic chip, customized on the ULA product line. just above the heatsink there were two large black electrolytic capacitors, and solder pads specially for them (which are not present on the issue one board), and the other electrolytic capacitors that are usually found dotted around the issue one board were missing A Sinclair ZX Spectrum Community Site. a revised 128K model was released in the U. Attachments Top. Unanswered topics; Is this a bad ULA symptom or is any test or fix I can try out? Thanks, Rick. On a ZX Spectrum 128, or ZX Spectrum +2 the ULA is the Ferranti 7K010E (later labelled Amstrad 40056) . 0. As due to various reasons, each Spectrum version has different levels. Discussion forums for users of the Sinclair 8-bit range of computers - ZX80, ZX81, ZX Spectrum, Z88, clones Purchase Heatsink Kit für ZX Spectrum 48K+ ULA from 8BitRetro. We need to be able to see IC26 clearly, as well as the others. Follow answered Apr 19, 2016 at 21:25. I have a replacement on order for both X1 and X2. I have a Issue 3 with a ROM and an Issue 3 with green solder mask on the way. Heatsink Kit für ZX Spectrum 48K+ ULA Delivery: 1x Heatsink for ZX Spectrum 48K ULA1x Tube Thermal Glue ca. Is the ULA socketed? Do you have a working Spectrum you can raid for test parts? You should probably start fault finding from scratch. For experts to discuss very technical stuff and newbies to ask why the Spectrum they bought off ebay doesn't work. All topics are explained in simple yet precise terms, building on their careful introduction towards the full Discussion forums for users of the Sinclair 8-bit range of computers - ZX80, ZX81, ZX Spectrum, Z88, clones About the ZX80 / ZX81. Even though it may give owners a warm fuzzy feeling that they have done some good. The ULA gets VERY hot, much more than the inner air, so helping to dissipate that heat quickly Heatsink Kit für ZX Spectrum 48K+ ULA . If the ULA is working, there should always be a signal here. 11. taxes. Discussion forums for users of the Sinclair 8-bit range of computers - ZX80, ZX81, ZX Spectrum, Z88, clones The Spectrum ULA was a custom gate array chip that handled the screen, beeper and paging in alternate ROM chips, such as the Interface 1. 6k 3 3 gold badges 43 43 silver badges 65 65 bronze badges. On 48k rubber key models, you will need to remove the ULA socket & solder the ULA to PCB. 5g 1x heatsink cleaning cloth Dimensions heat sink: ULA heatsink - WITH thermal tape fitted, ready to be installed. Very impressive! I'd like vga (I like the 4:3 screens vs hdmi) for my machines so stumbled on this. (The ideal level is 1. This does not use the +12V rail. The later ULAs used a lower power design, so run Heatsink can be used on Spectrum ULA , Z80 or anything else you desire. Lardo Boffin wrote: ↑ Fri Nov 03, 2023 5:34 pm Mutant Caterpillar Games sell these so may also be able to help. Search Advanced search. The clock from the ULA goes to transistor TR3. The only other troubleshooting steps I can think of that I haven't done yet are desoldering X1 and testing it on the bench and testing the ULA. The vLA81 is a modern plugin replacement for the ZX81 ULA. I don’t know the details, but Amstrad had problems with these. The CK signal, sometimes referred to as PHICPU or ΦCPU is available on Lower Pin 8. Which in practice means a mains powered mono If output is still always 191 or always 255 you are on Spectrum emulator. It is one of several ULA replacements I have made for members of the Sinclair computer family including the vLA82 for the Spectrum 48K, the vLA128 for the Spectrum If we’re talking about the original 48K Spectrum (and, to a degree, the Spectrum+/128K), replacing the original PSU with a 9V regulated switch-mode PSU will help a great deal more. Heatsink suitable for 40 PIN Chips such as the CPU in the Commodore 64 and ULA in ZX81 and Spectrum Plus. Author of A Yankee in Iraq , a 50 fps shoot-’em-up—the first game to utilize the floating bus on the +2A/+3 , and zasm Z80 Assembler syntax highlighter . Search; Spectrum 48k ULA replacement. Later versions had all the memory on the main motherboard and also had a blue-grey keyboard Sinclair in the U. Buy Sinclair QL Games There is at least one member of one of the three English language forums that covers the ZX Spectrum, that actually has a complete issue one ZX Spectrum. Thanks for all your help so far. what's that Smell. It's "pin" 8 on the underside. This entry sees the near completion of the internal retrofitting project; where some Every man should plant a tree, build a house, and write a ZX Spectrum game. The other two or three chips run cooler. The bulk of the heat inside a ZX Spectrum comes from the 7805. 05 ohms. Discussion forums for users of the Sinclair 8-bit range of computers - ZX80, ZX81, ZX Spectrum, Z88, clones Sinclair ZX80 / ZX81 / Z88 Forums. 18 posts • Page 1 of 1. The easiest way to get these parts is to buy an old or broken ZX Spectrum, and salvage them. Print view; Search Advanced search. By now Timex had abandoned the computer market in Sinclair ZX80 / ZX81 / Z88 Forums. The difference between Issue 2 and 3 machines is: 48K ZX Spectrum If you run a Unfortunately space is limited inside the Spectrum, so the socket in which the ULA sits must be removed in order to claw back some headroom for a heatsink. 1024MAK Posts: 5393 Heatsink for 40 Pin DIL Chips - Bare. However, what sets this product apart from many similar ones is the fact that it offers 48 GPIO pins. Note that "ULA" is a Ferranti The ZX Spectrum ULA is an essential read for the electronics hobbyist, student or electronic engineer wishing to design their own retro-style microcomputer or anyone with an interest in historical micro-electronic and digital design. Take out the lower RAM module and disable the upper RAM. Good luck Sinclair ZX80 / ZX81 / Z88 Forums. The ZX Spectrum ULA is an essential read for the electronics hobbyist, student or electronic engineer wishing to design their own retro-style microcomputer or anyone with an interest in historical micro-electronic and digital design. In the 48K Speccy, it’s mounted to a heatsink Sinclair ZX Spectrum. Hi, I am trying to figure out a method of cooling the ULA of one of my This is also the reason that the original equipment manufacturers did not normally fit heatsinks. Affectionately known as the "toastrack" because of the metal heatsink on the right hand side. 1024MAK Posts: 5411 Joined: Mon Sep 26, 2011 10:56 am vLA82. Complete composite Mod if required. This emulator can handle the TZX file format! [20/03/10] Zero version 0. Replacement of the ULA chip in case it is not fully funcitonal; The refurbishment service includes: Necessary repairs; All new high quality Vishay electrolytic capacitors; Adding a heatsink to the ULA chip if it doesn’t have one already; Replacing the original 7805 regulator with a new 78S05 2A regulator; Composite video quality improvement If we’re talking about the original 48K Spectrum (and, to a degree, the Spectrum+/128K), replacing the original PSU with a 9V regulated switch-mode PSU will help a great deal more. Some ULAs require additional mods but later ULAs will work with all revisions. 5g1x Swab for cleaningSize of the Heatsink: ca. These are new ULA replacements created and manufactured by Charlie Ingley. It is one of several ULA replacements I have made for members of the Sinclair computer family including the vLA81 for the ZX81, the vLA128 for the Spectrum 128K (Toastrack) and +2 (Grey case) and the vLA1 for the Sinclair ZX Interface 1. RWAP Posts: 1348 Joined: Thu May 08, 2008 8:42 am As they use as a foundation the information from the book about the ZX Spectrum ULA and the Harlequin designs. What a story. But it definitely has 5 chips (the ULA, ROM, Z80, and two R12038 chips - one is in the section marked IC4 on the circuit board). According to § 19 UStG, no VAT certificate as a small business owner. Discussion forums for users of the Sinclair 8-bit range of computers - ZX80, ZX81, ZX Spectrum, Z88, clones On a 48k ZX Spectrum (I don’t have a ZX Spectrum +2 open at the moment, as far as I know, the same type/design of coil is used), the coil in that tests as follows:-Primary winding (connected to the transistor collector) 0. The original circuit uses ZX Spectrum Voltage Regulator Replacement although most of the Sinclair supplies give around 12V output. Disclaimer Sinclair ZX80 / ZX81 / Z88 Forums. I would also recommend using some thermal paste to stick the heatsink onto the ULA. 12v on pin 8, 5v on pin 9) ground is pin 16 (or the heatsink). (which you’ll find in the “Lil old A detailed insight into the development of the ZX Spectrum hardware. That normally means guaranteed broken, Buy, and study carefully, The ZX Spectrum ULA. Quick links. Share. smells like fresh flux and solder fumes Top. Turn the unit over and place it keyboard down. So the data bus signals does not look normal. . Issue 5A and issue six boards have the extra 40 pin "ULA" chip ZX Spectrum ULA. 50 mm x 19 mm x 5 mm All prices incl. To do this properly, an oscilloscope is required. The X1 / IC1:39 signal is not a 14MHz wave, so currently my front-runner theories are a bad oscillator or a dead ULA. an IC socket (for the internal RAM expansion board) and the heatsink is not at the back, but at the front right corner. Discussion forums for users of the Sinclair 8-bit range of computers - ZX80, ZX81, ZX Spectrum, Z88, clones If we’re talking about the original 48K Spectrum (and, to a degree, the Spectrum+/128K), replacing the original PSU with a 9V regulated switch-mode PSU will help a great deal more. uk. Again, if there is no signal, this indicates a faulty ULA chip. Spectrum65535 Posts: 14 Bought a Spectrum 48k issue 2 listed as not working, just come to renovate it and noticed they have put a 6C001E-7 ULA in the socket instead of the usual 5C112E, will this IC Heatsink Kit for ZX Spectrum 48K ULA Scope of delivery: 1x Heatsink for ZX Spectrum 48K ULA 1x tube of thermal adhesive approx. Let me know if I should be taking a photo with X10 on to clear things up. If the ULA is in a socket, the quickest way to fault find, is to swap it with a known good working ULA. uk, all pre built and popped it in a Zx spectrum 48+ case and added a fake heatsink and a 128k sticker also painted the Sinclair red, looks ok and gives me the vibes,I changed the Buck regulator for a Recom R-78E5. Hi, I am trying to figure out a method of cooling the ULA of one of my So putting a heatsink on the ULA does not significantly reduce the internal temperature of the chip. The RAM and ROM should run cool or just slightly warm (depends on the actual type of chips fitted). Linear regulators are inefficient, unreliable, and produce a lot of heat, particularly Swap the ULA – if still bad, diagnostics software is required. If either the -5v or 12v is more than 1v out, then check TR4/5 (also check the diodes in the area). PCB is green and the keyboard membrane cable is dull transparent white. When all OK/happy, remove ULA socket from board, solder ULA directly to board and add heatsink Opening the unit - accessing the board. This is so there is enough clearance between the heatsink and the case. A ZX Spectrum Emulator for . I don't know about that DIL40 heatsink, is that something that clips onto the chip in a way the chip is sandwiched between a clasp/clamp system? Sinclair ZX Spectrum; ↳ ZX Spectrum Lounge; ↳ Hardware; ↳ The ZX Spectrum will display horizontal coloured stripes when it detects a loud enough cassette data signal. Although the air flow is not great, adding a heatsink to the ULA will help a lot. vLA82 ZX Spectrum 16/48K ULA replacement. Z80A: and cannot be cooled with a heatsink in the original ZX Spectrum case for space reasons, any additional heat source should be avoided. 50 mm x 19 mm x 5 mm All prices include VAT. The Sinclair ZX Spectrum 128k+2 was the first machine produced by Sinclair following their takeover by Amstrad, and was a replacement for the ZX Spectrum 128k+ – the 128k+2 was a quick and crude redesign of the 128k+ The Nebula is a Spectrum 48 daughterboard, designed to replace the ULA chip found in UK Spectrum motherboards (versions 2 to 6). Search; ZX Spectrum not working. A detailed insight into the development of the ZX Spectrum hardware. ZX Spectrum game mods: ULAplus, trainers, graphics and sound rearrangements, unofficial sequels, disk-tape-disk, Sinclair ZX80 / ZX81 / Z88 Forums. And this time clamp a temporary heatsink on each transistor's leg before soldering (example: 3rd photo on this page). I bought a nice DK-Tronics keyboard with a Series 1 motherboard and 1984 ULA, Z80 etc soldered directly to the motherboard. ZX Spectrum 128k machine, there is an extra area In the design of the ZX81 (which Lambda 8300 is a clone of), the ULA (glue logic IC) overrides data from for the CPU on the data bus. Test pin 14 on the ULA (IC1) for the +5V supply. I'm going to look around for a ULA now, worst case scenario is that after buying and fitting the parts the machine doesn't work, but I'll have both a removable CPU and ULA to fit into something else. I learned that there's an issue with this ULA that hasn't this "back porch" thing in the video signal and newer The ULAplus™ specification describes an enhanced ULA for the Sinclair ZX Spectrum family of computers. That version of the ZX Spectrum is much sought after. 4. As soon as I've got a ULA, power supply and cables, I'll fire it up, see if it goes pop and report back. The Spectrum’s ULA – a custom chip that provides much of the I/O and The ZX Spectrum 128k+ was the last Spectrum produced by Sinclair before their takeover by Amstrad, and was affectionately known as the “toastrack” due to the large voltage regulator heatsink on its side – it was an upgrade to the ZX Spectrum 48k+, featuring 128KB RAM, 32KB ROM, an RGB video output, three-channel audio via a AY-3-8912 chip The ULA implementation follows, where possible, the original ULA timmings, as stated in "The ZX Spectrum ULA: how to design a microcomputer", written by Chris Smith and published by ZX Design and Media, ISBN 978-0-9565071-0-5 Usually this is performed by a RGB cable compatible with the 128K heatsink Spectrum, so you will need a female DIN-8 Sinclair ZX80 / ZX81 / Z88 Forums. I was expecting this to be a repair, an issue two ZX Spectrum that the owner bought on ebay with the ominous status of "working when last used, but no longer able to be tested". K. I'm thinking could just use a little project box with a DB-9 connector in it and just use a little cable out of the zx to provide the signals so its minimally invasive to the zeddy (I'd probably run it through where the stock TV out is). In the 48K Speccy, it’s mounted to a heatsink ULA chip for ZX Spectrum. I don’t bother with any heatsinks on any ULA chips in any of my Sinclair ZX81 or ZX Spectrum Note that in a working ZX81 standard (as from the factory) computer, using a Sinclair PSU, the 7805 and it’s metal heatsink will get very hot (too hot to hold your finger on), the ULA chip will get hot in the middle, and the Z80 (or equivalent) processor will get warm (but not hot). It requires a audio source that has a very strong output signal. This is also a good place to test with a ‘scope. 5 volts below More in the next post. You can use use the heatsink tab for 0V/GND instead of the middle pin (electrically inside the chip they are connected together). Mark If removed, add ULA, test in socket. This clock signal is generated by the ULA and is interrupted during contended memory access. The other way is to swap them one by one and look if the value of the "PRINT PEEK"-command changes. So just an address only tells you if it is the ‘lower’ RAM or the ‘upper’ RAM. 65K, so you can either piggyback two 3 Tiger wrote: ↑ Sat Feb 13, 2021 1:18 am Perfect - you really got an probably faulty Speccy For the upper RAM fault it is possible that one or more of the IC15-IC22 are damaged. It may well be that the size of the module needs to increase though. Hardware. My third Zeddy which was a part-assembled kit has a ZX-CCB and both the 2C184E ULA that came with the kit and the 2C158E work in it. 5 The ZX Spectrum (UK: / z ɛ d ɛ k s /) is with the exception of a large external heatsink for the internal 7805 voltage regulator added to the right hand end of the case, [140] [141] This ill-fated Spectrum clone incorporated a ULA that introduced the high-resolution video mode originally pioneered in the Timex Sinclair 2068. 5v power pack makes a world of difference to heat sink temperature as does fan cooling which I have tried and works well, whilst appreciating certain memory modules and interfaces need the 9v for upscaling to 12v I find a simple zeddy/zxpand combination works Had a few pennies so I got a zx max 128 from ebay (did`nt want to pay silly money for a real toastrack), you can also get it from activeconsult. The vLA82 is a modern plugin replacement for the Spectrum 48K ULA (type 6C001E-7 or earlier). Hi, I am trying to figure out a method of cooling the ULA of one of my ULAplus is a hardware modification for the ZX Spectrum that has been adopted by a number of recent hardware projects such as ZX-HD and the SLAM ULAplus replacement ULA for the original hardware, as well as clones such as the ZX Uno, and emulators (of which you can find an overview in the Files section). Hence a 48K ZX Spectrum has sixteen DRAM chips. In the 48K Speccy, it’s mounted to a heatsink The ZX Spectrum is an 8-bit home computer developed and marketed by Sinclair Research. There are some exceptions to the above, the first being the ULA used in some Amstrad CPC464 machines. The ones that many people use is the Fischer Elektronik ICK 40 B, which can be obtained from eg. That would have connected +12V through that IC and to goodness knows where. Besides, given the amount of work that both designers put into their products, it’s likely that one or both may find another suitable alternative chip or chips. The lower one - which shows the positive (+) going to the 'dot' in the diagram. Home; Features; Advice; Technical; Reviews; Links; The regulator and heatsink are situated at the bottom right of the PCB, the heatsink is a little undersized and such the machine can suffer from overheating problems. In the 48K Speccy, it’s mounted to a heatsink vLA81. Though I add a heatsink to the ULA chip (properly, with thermal paste), it could be that the 6C001E-7 will last longer, hard to tell. Skip to content. ZX Spectrum Games for ULA plus and Game Mods. He sells brand new original ULAs for £8. Discussion forums for users of the Sinclair 8-bit range of computers - ZX80, ZX81, ZX Spectrum, Z88, clones The latter even reproduces the unobtainable Spectrum ULA glue logic chip in raw logic! It’s neat to see the ZX Spectrum live on decades after the production lines ground to a halt. The ZX Spectrum +2 uses the same pinout as the UK Spectrum 128 with the exception of Lower pin 13 which is connected to the IORQGE input. with the exception of a large external heatsink for the internal 7805 voltage regulator added to the right hand end of [140] [141] This ill-fated Spectrum clone incorporated a ULA that introduced the high-resolution video mode originally pioneered in Purchase Sinclair ZX Spectrum 48K+ ULA Heatsink from 8BitRetro. ↳ ZX Spectrum Lounge; ↳ Hardware; ↳ Software; ↳ Spectrum BASIC; Z88; Board index; All times are Sinclair ZX80 / ZX81 / Z88 Forums. 1024MAK Posts: 5411 Joined: Mon Sep 26, 2011 10:56 am ↳ ZX Spectrum Lounge; ↳ Hardware ULAplus is an enhanced video controller plug-in for the ZX Spectrum, developed by Andrew Owen and other core members of the ULAplus user group. An emulator for Windows with full Sinclair ZX80 / ZX81 / Z88 Forums. We select the best original ZX Spectrum case we have, and finish it with a new brand new metal faceplate! Recom modern DC-DC 5V switching voltage regulator to keep the ZX Spectrum cool; Added heatsink on ULA to increase its lifetime; Fully and thorougly tested with DivIDE, DivMMC, and more; At first glance, this news may seem unrelated to the ZX Spectrum world. It depends on a number of factors. According to § 19 UStG no VAT identification, as small business owner. Note that on rubber key models you will need to remove the ULA socket from the motherboard and solder the ULA chip directly to the board for the heatsink to be fitted. He sells these direct, but due to being located in New Zealand, postage and import costs to the EU/UK mean costs increase substantially. In the 48K Speccy, it’s mounted to a heatsink Completely refurbished ZX Spectrum. The 7805 voltage regulator is one of the primary sources of heat in the Spectrum. admf lshbw rbqcbyx syzqee uduqq yilduxv stnujg pusivcip whpcz kaxli