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256K RAM chips in Spectrum 128KSince I have lot of 256K RAM chips, and my 128K has RAM error, I think about replacing all 16 RAM (64K ones) chips with 256K chips. Then it would be …
... lot of 256K RAM chips, and my 128K has RAM error, I think ... about replacing all 16 RAM (64K ... be 'Spectrum 512K' - something like RAM in Pentagon.
Of ... : bank switching of that extra RAM - we need 2 bits more ... -
ZX Spectrum 48k Issue 2 Faulty Ram?Hi, I have a faulty ZX Spectrum Issue 2 motherboard. Looks in very tidy condition. Though I'm getting random columns of blocks and flashing cursors…
Hi, I have a faulty ZX Spectrum Issue 2 motherboard. ... read would indicate a lower ram failure. I have lightly touched ... seem cool.
The ram fitted is 8322 4116 2N ... -
POKEs on 128K "upper RAM"?I've been working lately with some 128k games, and I've got this question about RAM in games. I guess most games use RAM pages 5 and 2 to store the …
... some 128k games, and I've got this question about RAM in ... /> I guess most games use RAM pages 5 and 2 to ... the main program, and other RAM pages are used to store ... that needs POKEs placed in RAM pages 1, 3, 4, 6 ... -
ZX-81 Ram Pack problemHi! I know this is a ZX Spectrum forum, but I am hoping someone here might be able to help me out... I have posted this to c.s.s. but noone was able…
... which is probably normal since ram
test takes ...
Sinclair ZX 16k ram pack issue 3 .
ram pack :
... still a posibility of faulty RAM somewhere on the lower ... is faulty or not.
Also when no ram ... -
Diagnosing Spectrum 48k (faulty RAM chip?)I have a Spectrum 48k (I believe it may be an upgraded 16k model) that doesn't work, and never has ever since the owner gave it to me. When you turn …
... joints for the bottom-left RAM chips seem to be very ... physically on the board which RAM chip the display attributes is ... on. This all points towards RAM for me - I don't ... -
faulty zxspectrum +hi all i just bought a speccy 48k+ off ebay it worked for like 15 mins now it is stuck on the reset screen. I fear this is something major maybe fau…
... this is something major maybe faulty ram or the ULA. Does any1 ... -
changing extended RAM pages in SpinIs it possible to edit the data in 128k extended RAM pages in Spin? I've tried both the debugger tool and the pokes tool and, although they let me ma…
... to edit the data in 128k extended RAM pages in Spin? I ... -
Faulty +2 advice please :)Hi all , I have a faulty +2 which when powered up gives a black border and 6 black and White stripes , I'm thinking faulty ram ??? Any one have any b…
Hi all , I have a faulty +2 which when powered up gives a black border and 6 black and White stripes , I'm thinking faulty ram ??? Any one have any better ideas :)
CodenameV -
RAM Diagnostic ROMhi all, i burn this ROM from here [url]http://www.fruitcake.plus.com/Sinclair/Interface2/Cartridges/Interface2_RC_New_RAM_Tester.htm[/url] and i a…
... try to diagnostic a probably RAM fault on my +2 grey ... have some new and old RAM ics KM4164B-12 [B]only ... /> how i can identify the faulty RAM ic?
any tips will ... -
ZX Spectrum upper RAM module (4532/4164 replacement)Following the [URL="http://zx.zigg.net/LRR/"]lower RAM replacement module[/URL], there have been quite a lot of requests for something similar for th…
... zx.zigg.net/LRR/"]lower RAM replacement module[/URL], there have ... zx.zigg.net/LRR/"]lower RAM replacement module page[/URL] and ... as the lower RAM replacement and emulates dynamic RAM.
Here ... you'll have to remove faulty RAM ICs in order to install ... -
RAM issue for potential 48k buy?Hi guys I've got a 48k in my sight for ?20 but... it has an issue: [QUOTE]"I tested the computer and only displayed a distorted screen. Coloured …
... ]
Would this be faulty RAM chips? I've seen similar ... -
ZX Spectrum+ showing 16K of RAMHello again, as the title says my ZX Spectrum+ is showing only 16K of RAM instead of 48K when running a memory check. [url="http://www.1000bit.it/su…
... + is showing only 16K of RAM instead of 48K when running ... on how to identify the faulty RAM chip, but I seriously have ... -
Interrupt timingsHow long does the ULA hold /INT low for on interrupt on each of the Spectrum models?
... 36T on my real Spectrum 128K (black).
BTW, maybe ... and 35T for 128K... looks like I have a faulty RAM chip in ... -
Want a Speccy Repaired?Maybe it's time to put my 'skills' to use.... Now that I've sourced some of the nastier transistors, I've fixed about 6 rubber keyed Speccys in the …
... that writes to screen RAM every bit pattern, and ... 2 now: I have suspected ram fault (coloured flashing blocks). ... must be something wrong with ram.
What ... way to find the faulty ram/rams? Is it possible ... that it can check whole 128k ? And what is ... -
Jetpac questionHi all, I just bought a copy of Jetpac off of Ebay and I'm having problems. To start, I'm trying to play it on an issue 2 Speccy with Interface 1, 2 …
... fault in the screen RAM pixel area would be ... address of the lowest faulty byte found and does ... emulator, modified to simulate random faulty RAM.
This ...
It does not test 128K RAM.
Once one ... of [b]16/48K RAM Tester[/b] here:-
upgrades what you looking for?i start working for upgrades for ZX, but i'm Atari specialist and i don't know exactly what you need for ZX. On the moment i have DIVIDE in stock, an…
[QUOTE=Cameraman;348837]A ram adapter card to replace faulty ram ic's with ... ;)
Recently replaced the lower RAM on a Speccy 48K with ... full Spectrum replacement (48K or 128K compatible). Think a circuit board ...Help with Spectrum 128k reparationHi! I have the following symptoms with a 128k unit version 6U - On power on, black and white bars (one char width each), white background - Once po…
... have a faulty RAM chip. These are single supply RAM's, so ... 't remember if the 128K heatsink model has that ... colour feature to identify bad RAM chips.
... determine if the fault RAM is in contended or ... fault is in contended RAM, and the special tester ...RAM Diagnostic ROMhi all, i burn this ROM from here [url]http://www.fruitcake.plus.com/Sinclair/Interface2/Cartridges/Interface2_RC_New_RAM_Tester.htm[/url] and i a…
... /> how i can identify the faulty RAM ic?[/QUOTE]
The ... />
Because this is a 128k byte machine, there are two ... of eight 64k RAM chips giving a total of 128k bytes.
If it is a faulty RAM chip, it is not possible ...RAM Diagnostic ROMhi all, i burn this ROM from here [url]http://www.fruitcake.plus.com/Sinclair/Interface2/Cartridges/Interface2_RC_New_RAM_Tester.htm[/url] and i a…
... />
Because this is a 128k byte machine, there are two ... of eight 64k RAM chips giving a total of 128k bytes.
If it is a faulty RAM chip, it is not possible ... and found the faulty line? he said the contended ram ic's ...Possible dodgy +2 - resets when loadingSo I have a grey model +2 with a recently refurbed tape deck (new belts and cleaned heads). It might be a product of bad loading, but from what I ca…
... freescape games and some 128k versions / 128k only games. Specifically it ... , that if you had faulty RAM then games would crash or ... but on a 128k model actually pages RAM blocks in and ... :)
48K mode disables 128K RAM paging until a reset, hence ...Spectrum 128k +2A Resets after loadingHey Everybody, I'm from Australia and I'm new here in the forums. I was hoping to pick everyones brains over a problem with a Speccy I acquired o…
... it must have been some faulty ram chips. I was able to ... source 4 new NEC RAM chips and replaced all four ... issue now, even the 128k ones. Even 128k Cybernoid loaded without a ...AY tracking newbieHey everyone, I'm about to embark on tracking for the Spectrum's AY chip. I was interested in knowing some things: 1) Which are the best trackers o…
... tehse programs only run on 128k of RAM)
3) Can I ...Problem with replacing all upper memory with 4164 chipsGuys, i have a problem with the high memory of a 4B issue. At first the board had OKI chips for high memory and one of them was faulty. Since its ea…
... and one of them was faulty. Since its easier, i got ... program it sais there is faulty RAM at address 8000, and when ...Name The Game ... Commando/Duet style game.I remember playing a Load'n'run game coupla decades ago, it was a Commando-themed game, the layout of the playing screen was very similar to [URL="ht…
... before ... oh, well ... that's faulty RAM for ya.4116 DRAM for 48KSomeone told me I got faulty RAM in my broken 48K. They should be 150ns, right? What would be a good place to buy them from?
Someone told me I got faulty RAM in my broken 48K.
They should be 150ns, right?
What would be a good place to buy them from?Why did the QL fail?Browsing some old magazines: an advert appeared for the QL, 128k of ram and 32 bit processor etc...also very cheap compared to other similar spec com…
... appeared for the QL, 128k of ram and 32 bit processor etc ...ZX Spectrum Woes...In my endeavours to get my second Spectrum (Issue 3) working I have replaced the CPU, memory and lower ram. I have fitted sockets for the CPU and me…
... the CPU, memory and lower ram. I have fitted sockets for ... by the two previously assumed faulty RAM chips.
The only ...Issue 3 power problemHi all, I have an issue 3 board with an odd power problem, I have no -5V in fact, measuring the voltage on this line leads to a surprising result : …
... replaced TR4 & TR5, as faulty RAM can often take these out ... -5V decoupling caps for the RAM, just in case one of ... to anywhere other than the RAM ? as that might be a ...No colour - Issue 2 SpectrumThis one is driving me mad - any suggestions appreciated. I have an issue 2 Spectrum with no colour at all. I found the 12v rail was at just over …
... over 9v, and although the RAM was working, assumed this may ... must have found the elusive faulty LM1889, so replaced it. No ... see how they could be faulty but still allow monochrome video ... a repair on another board (faulty RAM), I will try and run ...
