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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 ... loading. I tried other new 4164 chips (in case one of ... when replacing OKI chips with 4164?
In D4164C -3 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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…
... program it sais there is faulty RAM at address 8000, and ... . I tried other new 4164 chips (in case one ... relocate it to screen RAM. Because it initially loads ... screen is in contended RAM and appears fine. When ... part in the uncontended ram, you see corruption from ... -
Issue 3B only sees 16k (and RAMTOP NO GOOD on loading)A ZX+ with issue 3B board that i got recently, does not see anything more than 32768 (sometimes 37267..) on "PRINT PEEK 23732 + PEEK 23733 * 256 (Ent…
... =Asure;610485]Regarding the RAM, these things are expensive ... br />
Use 4164 DRAM's. Cheaper, a ... s are actually factory faulty marked 4164 DRAMs) and less ... and 14 in the faulty chip, so they ... faulty chip.
here you have some supplies of 4164 ... -
Repairing another Issue 2 48K Spectrum.I said at the start of the other thread that I've got another one of these and I've started investigating it. The board is more-or-less exactly the …
... suspecting that an upper RAM IC would be the ... problems. Installing a good 4164 for IC22 still resulted in ... PEEK in upper RAM suggested more than one faulty RAM IC. So, ... I de-soldered all the upper RAM ... 4 of the 8 were faulty. It now seems to ... -
Spectrum 128k advice neededHi, I'm new to this forum and the spectrum world. I have this spectrum "toastrack" that was working fine until today. It doesn't boot anymore, it s…
... a socket and a new 4164 chip, run the test again ... until there were no more faulty RAM IC's. There were 3 ... total faulty RAMs, now the machine boots ... -
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? -
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 ... -
+2aI have a +2a and it wont boot properly get the white border with black square when first powerd on but then just goes into a black screen instead of …
... as when I had a faulty ram chip. The one furthest left ... 1 +2A boards have the ram soldered on [img]/__forums/images ... -
Old Computer Speccy mentionMany of you may know about this already but there is a nice article on the speccy on a French (English Speaking) site called old-computers.com. There…
I've just noticed they say and the FAQ says the +2A was made in Hong Kong and the +2B was made in Taiwan. Isn't it the opposite? The baud rate of the spectrum is 1500 not 1200. There's some interesting talk on faulty ram chips and holding back the 128. -
new release of winTZXHi all I released winTZX 0.4drc1 (04/02/2005) + Added CSW file support + Added block selection (replay and save) + Added reverse output + Added direc…
... issue 3B, the 8 chip RAM are 4532 this mean (32K ... that RAM are faulty ?
In my spectrum only one RAM is faulty so ... only 7 bits are stored, the faulty RAM always ... -
Interrupt timingsHow long does the ULA hold /INT low for on interrupt on each of the Spectrum models?
... ... looks like I have a faulty RAM chip in my head, since ... -
Spectum 16kHi Is it possible to play a 48k spectrum game on a 16k spectrum, if not is there anything i can purchase to boost up the computer to play the game?
... but I thought they used faulty 32K ram chips in order to ... probably be more like 2 faulty 32K ram chips.
Either ... /> What do you mean by "faulty" ram chips?
I just ... "technical" usage of the word faulty. Live and learn ... so please ... -
Spectum 16kHi Is it possible to play a 48k spectrum game on a 16k spectrum, if not is there anything i can purchase to boost up the computer to play the game?
[quote]What do you mean by "faulty" ram chips?[/quote]
[quote] by utlising the fact that although faulty [32k memory chips] 16k still worked fine.[/quote] -
Spectum 16kHi Is it possible to play a 48k spectrum game on a 16k spectrum, if not is there anything i can purchase to boost up the computer to play the game?
... ]What do you mean by "faulty" ram chips?[/quote]
[quote ... utlising the fact that although faulty [32k memory chips] 16k still ... part) 16k of the 32k ram worked fine? (or is your ... -
is my ZX Spectrum + finished :(When i turn it on the screen i get the usual gray border all around but in the screen area i get yellow and some orange lines with a black background…
Faulty RAM chip, probably? If you search the forum, you should find several diagnoses and proposed solutions.
Good luck! -
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 ... by one of the upper RAM chips! A quick replacement ... 2 now: I have suspected ram fault (coloured flashing blocks). ... must be something wrong with ram.
... way to find the faulty ram/rams? Is it possible ... -
Spectrum Issue two problemI managed to bring back to life a issue two spectrum (at least the power supply cirquit). The screen is now crystal clear (after replacing all the el…
... membrane, I'd check the RAM. Try POKE/PEEK to various ... higher memory (ie, >32767). Faulty RAM will make the ROM memory ... -
Spectrum Issue two problemI managed to bring back to life a issue two spectrum (at least the power supply cirquit). The screen is now crystal clear (after replacing all the el…
... remains is to check for faulty ram (fast booting).
I tryed ... to PEEK the ram (as the repair guide says ... has to be the first RAM chip (at least) or could ...
