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Early ZX80/81 RAM Pack???Hey all I got given this RAM pack... It doesn't work (i know why now) but compared to my RAM pack this one is really strange... Is this a ZX80 RAM p…
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I got given this RAM pack... It doesn't work ... now) but compared to my RAM pack this one is really ... strange... Is this a ZX80 RAM pack or something as it ... -
Upper Memory LinksI've got an 1982 Issue Two Spectrum 48k with an upper RAM fault. I've narrowed down the faulty IC and I'm in the process of removing the 8 IC's, sock…
... Spectrum 48k with an upper RAM fault. I've narrowed down ... added to work with the replacement -3 suffix chips. The voltage ... -
AMSTRAD 40057 - joystick decoder replacementThis is replacement of joystick decoder "AMSTRAD 40057" for Amstrad model ZX Spectrum 128+2 (grey). This project is not tested, but theoretically wil…
This is replacement of joystick decoder "AMSTRAD 40057" ... -
Issue 6 repair with a twist...(Starting with a slight grump - the forum ate my first attempt at this so this'll probably end up being a bit terse :)) I got a Issue 6 48K machine …
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I suspected faulty upper RAM trashing the stack, and this ... reporting both lower and upper RAM were healthy.
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One swift 4116 replacement later, and the machine was ... then reinitialised, and the RAM being tested is compared against ... -
ZX81 internal RAM board?Just a quick question to Zorn (amongst others). What would the issues be with fitting one of Zorn's RAM boards into an unexpanded ZX81? Seems to me…
... fitting one of Zorn's RAM boards into an unexpanded ZX81 ... a lot of the official RAM pack's internal circuitry is ... one - preferably the 32K upper RAM board, 'cos I never had ... -
The complete Manic Miner RAM disassemblyHot on the heels of the [url="http://skoolkit.ca/disassemblies/jet_set_willy/"]Jet Set Willy disassembly[/url], here is [url="http://skoolkit.ca/disa…
... /manic_miner/"]The complete Manic Miner RAM disassembly[/url] (Bug-Byte version ... -
Interface 1bis RAM Drive modificationAll Interface 1bis users I hope I am not interfering with Dan, but I saw on his site that he has a RAM Drive upgrade/modification for the Interface …
... site that he has a RAM Drive upgrade/modification for the ... have an on-board 128K RAM drive, the user must install ... -
Issue 1 oddityHello to everybody, I have a very first under my hands - a broken Issue 1. Apart from the classic "broken lower RAM" syndrome which will be easily t…
... from the classic "broken lower RAM" syndrome which will be easily ... blue. Even Paul Farrow's RAM tester shows its white bars ... operative after the obvious TR4 replacement.
Composite signal is ... -
Issue 2 Upper Ram, Loading & ResettingI have a 48k Issue 2 Speccy and for the life of me can't track down what the problem is with it. I initially thought that some of the uppe ram ic's w…
... that some of the uppe ram ic's were faulty ... on to desoldered the upper ram ic's, socketed the ... board and replaced the ram with known good chips. ... replaced all the upper ram with known good ram from another Issue ... cant now be the upper ram as I swapped and ... -
Double keystrokes on zx spectrumHappy New Year everyone. I have this spectrum 48k issue 3b I?ve been working on now and then. I have replaced upper rams, installed a lower ram repla…
... upper rams, installed a lower ram replacement module and it starts up ... -
Ram Turbo Interface with Kempston and Sinclair/Amstrad joysticksHi! Do you know how to plug and use two different joysticks with the Ram Turbo interface? [url]http://www.worldofspectrum.org/infoseekid.cgi?id=1000…
... two different joysticks with the Ram Turbo interface?
[url ... -
80K RAM UpgradeAn 80K RAM upgrade has been listed on sellmyretro.com (not by me). It is based on the one originally designed by Sandy Electronics and has their p…
An 80K RAM upgrade has been listed on ... /details/NEW-SCT-MODULE-EXPANSION-RAM-80K-FOR--ZX-SPECTRUM-4119 ... -
Issue 1 16K RAM bankFolks, I recently had a chance to fix a couple of Issue 1 boards, and learned the hard way that the chips in the 16K RAM bank have a different place…
... the chips in the 16K RAM bank have a different placement ... from 2 up have the ram chips lined up the most ... meaningless reports from the Fruitcake RAM tester, I finally checked all ... -
128K RAM tester as .TAP?I was sure that I've seen a RAM tester that can be loaded with e.g. DivIDE or DivMMC EnJOY! as .TAP. But I can't find it (been searching through the …
... that I've seen a RAM tester that can be loaded ... 128K machines, and if lower RAM works fine, and there is ... a small error in upper RAM.
I have a ... -
Wanted: RAM Turbo InterfaceHi guys I am on the lookout for a RAM Turbo interface so anyone has any going spare then please give me a heads up. Cheers
Hi guys
I am on the lookout for a RAM Turbo interface so anyone has any going spare then please give me a heads up.
Cheers -
Loads of Microdrive cartridges on Ebay plus Vortex RAMI?ll be selling three bundles of eight Microdrive cases with four, used cartridges each, means 32 cartridges per bundle, here?s one of them [img]http…
... an untested Vortex SP 512 RAM expansion with CPU and ULA ... -
Replacement speakers for 16/48K SpectrumsThought I'd share a source of replacement speakers for the 16/48K machines: http://uk.rs-online.com/web/p/miniature-speakers/7903975/ (Equivalent…
... 'd share a source of replacement speakers for the 16/48K ... -
Another silly hardware idea - RAM Pack adaptorHow about a mini bit of PCB that adapts ZX81 RAM Packs to replace the address space of the Spectrum's ROM? I guess practically you'd need a way to…
... of PCB that adapts ZX81 RAM Packs to replace the address ... well just design your own RAM board.
Could have ... -
Turbo RAM Glitch or feature ?I have been testing a Spectrum [url="http://www.worldofspectrum.org/infoseekid.cgi?id=1000328"]worldofspectrum.org/infoseekid.cgi?id=1000328"]RAM Tur…
The history of ESXDOS, the DivMMC and the DivMMC EnJOY![img]http://benophetinternet.nl/hobby/divmmc_history/1%20esxdos.jpg[/img] These are the stories behind esxDOS, the most popular operating system e…
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ROM and RAM in More Detail
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- DOS in ram: more commands/funtionality can be ... was looking for a replacement for these.
... , but there are more ram pages available.
< ...ULA Replacement??I searched, but maybe I just missed it. Has there (or is there) anyone working on a ULA replacement either as an FPGA or CPLD package? Or, perhap…
I searched, but maybe I just missed it.
Has there (or is there) anyone working on a ULA replacement either as an FPGA or CPLD package? Or, perhaps something else such as a microcontroller?
ThanksTesting a RAM packI had my Spectrum + today which is working, but i also had a ZX Spectrum 32k RAM Pack and i wanted to test it. Is there anyway i can test this on the…
I had my Spectrum + today which is working, but i also had a ZX Spectrum 32k RAM Pack and i wanted to test it. Is there anyway i can test this on the Spectrum + and if so how ?
thanksPower issues on a 6A 48 K SpectrumHello all! I decided to take another look at my 6A Spectrum that I broke via a bad joystick adapter, I’ve removed the bottom 16K ram and replaced…
... ’ve removed the bottom 16K ram and replaced TR4 and TR5 ... wrong here.
[b]RAM test:[/b]
previously I ... got the same values with replacement.
+ on centre, - on leg ...48K Issue 3B ROM to EPROM methodsHi folks, While fixing up a completely dead Commodore PET I needed a way of testing the 4116 RAM chips that make up its 32K, some googling found a…
... way of testing the 4116 RAM chips that make up its ... of doing the ROM - EPROM replacement, either the diode+pullup resistor ...Testing 4116 type DRAMsHappy New year All! I'm managed to find some time to repair some more Spectrums :) woo hoo. I have a couple with busted lower RAM, Sooo, I appr…
... a couple with busted lower RAM, Sooo, I appreciate I could ... a swanky ZX Spectrum Lower RAM Replacement Module, but I think that ... feasible to actually make a ram module replacement with ease?Sound Card Advice.For Years I have owned an Audigy 2 ZS sound card, and it's trundled along very well and produced a sound that has kept pace with some very nice appli…
... you have over 4GB of ram installed the beast will refuse ... /> I am looking for a replacement with similar capabilities, i.e ...spectrum 48k issue 3b coloured blocksI have pucked up a nice looking plus but when powered on get black or yellow border and random coloured blocks on screen, I have taken keyboard off a…
... and. socket fitted and a replacement cpu fitted if it's ... 's messy as for the ram the 8 chips are 4116 ...12V ripple with lower ram installedI repaired a speccy this week. Before doing anything I replaced all caps and measured the transistors in the power section. When doing this I found t…
... a problem with the ram. I ran the diagnostics ... and socketed all lower ram. turned the speccy back ... scope. Inserted a lower ram module and the speccy ... Then removed the lower ram module and reinserted all ... original lower ram ic's. Speccy is ...Retroleum Nebula - A Spectrum ULA replacement moduleHey you guys.. Just wanted to mention a new Spectrum doobrie created by myself (Phil Ruston) and Alessandro Dorigatti: Namely, the Nebula - A Spec…
... Nebula - A Spectrum 48 ULA replacement module. You can read all ... -articles/nebula-spectrum-ula-chip-replacement-module/
(Big thanks ...Non working issue 3BGuys Hope you can help me here (or maybe, someonene from Europe could take a look at it? I've already tried different ULA, CPU, ROM and low RAM (…
... ULA, CPU, ROM and low RAM (replacement module with static memory). Still ...
