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48K Issue 2 Spectrum showing exactly 16KI've acquired an issue 2 and it quickly became clear that only 16K of memory is available. I've read that some early 48K Spectrums with malfunctionin…
... how you've determined the faulty RAM chips.
If each ... RAM chip stores one data bit and POKEing the first faulty ... bit corresponds to a specific RAM IC? I presume that it ... -
What should your speccy have come with ?:) I was thinking about this earlier. What changes should of been made to the Speccy when you purchased yours ? Realistically this topic really…
... resources (Except for the 128K model, but this was ... , and one without like the 128K+
- Full QL ... />
- 80K RAM (64K of Upper RAM available) allowing 16K for ... compatibility)
- 128K base RAM up to 512K internally expandable ... -
Thinking about my gameAnother long post, I'm afraid. Somewhere on this Forum is a short chunk of text I put up as a sample of what I'd like to turn into a text adventu…
... long descriptions, try the 128K mode RAM disk to save extra strings ... -
help with issue 3 48k speccy after recap and new tr4 and tr5I have a 48K speccy that was not working. After recapping and replacing TR4 and TR5 it came back to life However after a short while running weird …
... -5V.
The 'lower' RAM chips (type 4116 or equivalent ... present can damage the 4116 RAM chips.
The ... very likely caused by a faulty RAM chip.
The quickest ... way of fault finding suspect RAM problems, is to run a ... -
Keeping up to date with PC builds.I only do PC builds infrequently and I have stopped reading Micro-Mart so my abilities in the area can languish pretty quickly. But if it is new i…
... we found out about RAM DIMM modules causing Blue ... : they appeared to be RAM related . We did the ... My son thought it was faulty RAM sticks or stick . We ... tried the original supposed faulty stuff ,one stick at ... of re-seating the RAM DIMMs solved the problem ... -
help with issue 3 48k speccy after recap and new tr4 and tr5I have a 48K speccy that was not working. After recapping and replacing TR4 and TR5 it came back to life However after a short while running weird …
I'd suspect the lower RAM chips first - obviously check ... been corrupted - indicative of faulty RAM, and I'd say an ... being messed up by a faulty RAM chip or two. Not ... can still get a lower RAM board, but that may ... way forward if indeed lower RAM is to blame, those ... -
Another Spectrum is brought back to life.Hi Spec-chums. I have been having bit of busy afternoon with repairs today. I've brought back to life a Panasonic Super-VHS recorder, and more intere…
... screen? I know sometimes ram chips can be faulty, or the ULA ... booted if the Spectrum has faulty ram IC's. The diagnostic rom ... will identify which IC is faulty making fault finding a breeze ... ]
And regarding the faulty eBay Spectrum. If the seller ... -
The Different Approaches To Upgrading the ZX Spectrum from 16K to 48K This is probably something that has been covered before . I will take a look to see if I can find anything on WOS
... already brought an upper ram module from Retroleum. The ... of your questions about ram modules. I have ... repaired with a lower ram module. Only thing ... your replacing previously fitted faulty ram, then you have to ... current draw with the ram modules though. Other ... -
GZX 2020.1 ReleasedHi, I just released [url="https://github.com/jxsvoboda/gzx/releases/download/v2020.1/gzx-2020.1.zip"]GZX 2020.1[/url]. [youtube]3AOQETbfrPA[/yo…
... and [i]LCP[/i] are 128K-only. All of the others ... on a 48K, not the 128K ones. Those warnings could ... user could wrongly play the 128K side of the tape ... Spectrum equipped with at least 128K of RAM", [/i]the user ... software that's billed as 128K-only runs on a ... -
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…
... until there were no more faulty RAM IC's. There were 3 ... total faulty RAMs, now the machine boots ... -
Fruitcake Ram Tester - What does CORRUPTS mean?Hi All, Getting the message "Corrupts" as in "Corrupts 1" showing up on my test... What does this actually mean? The documentation on the site doe…
... faults just by tapping the faulty RAM chips... Just a tap and ... how I found the final faulty chip in the end... One ... -
Missed opportunities in the 80'sAll the talk of the Loki got me thinking... What if someone had built an expansion box for the speccy that had the 3812 Yamaha music chip ( Adlib Sou…
... /> [list][*]The various 16k byte RAM packs for the ZX81 (mainly ... connector
[*]80k bytes of RAM as standard[/list]
All ... users.
Then the 128K should have expanded on this ... more flexible use of the 128K of RAM.
And ... -
Spectrum +3 not working [HELP]Hi, When i turn on my zx spectrum +3, im presented with a black screen with a solid green border all around it. Anyone here knows whats the meani…
... 1OO% focus on being a ram issue and ill change the ... ;)[/quote]
Sometimes a faulty ram IC can be hotter to ... -
Spectrum +3 not working [HELP]Hi, When i turn on my zx spectrum +3, im presented with a black screen with a solid green border all around it. Anyone here knows whats the meani…
... guilty, it was only 1 faulty ram chip, the other 3 are ... -
128K+2A/+3 RAM layoutDoes anybody know how physical RAM is mapped to ZX 128k+2a/+3 address space ? There are four 64Kx4 chips IC4-IC7. IC4-IC5 seems to be contended (vide…
... know how physical RAM is mapped to ZX 128k+2a/+3 address ... be contended (video RAM). It would mean RAM banks 4-7
RAM test program, can be on ... -
File size in 128K RAM diskHi Folks, Is there a way to get the size of a file stored in the 128K RAM disk from within a BASIC program? Many thanks Paddy
Hi Folks,
Is there a way to get the size of a file stored in the 128K RAM disk from within a BASIC program?
Many thanks
Paddy -
Repaired some 128K's todayI have lot's of ZX Spectrums laying aside with some more complex defects. Today I decided to try to fix some of them. I thought: why not share my ex…
... out.. it was not a ram chip: the 'shortcircuit' was further ... on screen there was some ram checking done when booting, like ... , and stopped working after the '128K boot'.
I then soldered ... error is identified then the faulty line is indicated by displaying ... -
Faulty Grey Spectrum +2 - help neededI have a faulty spectrum +2. I tested the voltaged inside - all check fine. Well, within some limit, +5 for example is 4.83, but all other voltages a…
I have a faulty spectrum +2. I tested the ... know is ULA for toastrack 128K is the same. Is it ... . What's left? ULA and RAM.
Cannot test ULA and ... how to search for back ram chip in such situation.
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 ... be used on 128K machines, and if lower RAM works fine, and ... a small error in upper RAM.
I have a ...Spectrum 48+ 4S - Upper RAM issue, and now a self-created problem!I recently picked up a known-flaky spectrum off eBay, to have a bit of fun fixing it and reliving youth. It was labelled as 'keyboard duff, shows…
... said the whole of upper RAM was faulty (check all ICs). Poking ... 've removed all the upper RAM ICs, replaced with sockets and ... .
Given the lower RAM used to be okay, and ... built one of the Harlequin 128k revision 2D boards, with the ...RAM Music MachineBoxed RAM Music Machine Sampler (for 48K, Plus, 128K, Plus two) includes the tape, microphone, manual, even original mic stand! I last got this wor…
Faulty 128KI digged out my Spectrum 128, and it wakes not up. I don't have experience, only with 48K. Maybe someone can give me some hint, clue. It looks like m…
... ROM). So, it looks like RAM error. Is it worth to ... replace RAM chips? ULA is warm (probably ...128k dead, no TV signalI got 128k spectrum (heatsink model) from a friend of mine. He told me that speccy is dead, and he doesn't know what's wrong with it. When I plugged…
I got 128k spectrum (heatsink model) from ... ). When I left speccy 128k for 10 minutes powered up ... function? What else could be faulty?
My strong ... read as a child about 128k and it would be ... time (never before I saw 128k) to see it actually working ...128K memory testingDuring a mad half hour I decided to write a little memory tester program in BASIC using the information from the 48K service manual. Now I was wonder…
... way of testing the ram on a 128K speccy.
Any ...Spectrum RAM Paks...This jogged my memory (excuse the pun!!) : [url]http://cgi.ebay.co.uk/CURRAH-32K-RAM-PACK-BOXED-SINCLAIR-ZX-SPECTRUM_W0QQitemZ150057889352QQihZ005QQ…
... .ebay.co.uk/CURRAH-32K-RAM-PACK-BOXED-SINCLAIR-ZX-SPECTRUM_W0QQitemZ150057889352QQihZ005QQcategoryZ50223QQrdZ1QQcmdZViewItem ... RAM pak.
It never worked properly!! The 32K was faulty ... playing them!
16K RAM paks were very popular for ...Any interest in new low-cost mass-storage interface with 512K RAM?I've recently added support to ResiDOS and the +3e ROMs for SD/MMC card interfaces; in particular, ZXMMC (which has no onboard RAM and so is only sup…
... ZXMMC (which has no onboard RAM and so is only supported ... switched between instantly (only one 128K task currently supported)
[*] ... retained in the built-in RAM and are instantly available when ... run from the built-in RAM, including ZX80 and ZX81 emulators ...ZX Spectrum 128k (Spares) For SaleHi I have for sale here a faulty ZX Spectrum 128k. The fault is the video appears to be broken (i am guessing). When outputted onto tv you get a dis…
... for sale here a faulty ZX Spectrum 128k. The fault is the ...+2B ram chips?Hi all, I have got 2 Plus2B`s and 1 Plus2 gray case. Ok the one Plus2B don`t work, so I tried to see if I could pin down the problem. I changed the …
... br />
There are 4 ram chips on sockets on board ... br /> I then removed 2 ram chips IC6 and IC4 replace ... dwith 2 other ram chips that to be honest ... sure if that was a faulty ROM or not?
< ... br />
If its the ram chips then I shall buy ...
