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First time capacitor replacementHi, I have an Issue 2 board, that i wish to start with recapping as advised on here, as they look to be all original. (Same with V3 board, but going…
... typical pattern of a lower RAM failure any more.
I ... most likely in the upper RAM area.
You could ... -
First time capacitor replacementHi, I have an Issue 2 board, that i wish to start with recapping as advised on here, as they look to be all original. (Same with V3 board, but going…
... typical pattern of a lower RAM failure any more.
I ... most likely in the upper RAM area.
You could ... -
Issue 3 board with strange piggy-back boardIn case you are interested. I?ve never seen something like this before. I have an Issue 3 board here. When I opened the case and found a strange pig…
... times) to indicate the lower ram failure
- After that all LEDs ... me this means that all RAM chips are faulty which is ... and all upper Ram chips
128K Ram test ROM
harvard architecture spectrum clone.I got my first +2 before christmas. I'd never given the 128k spectrums much thought, always been a 48k rubber key tradionalist. :smile: I've been me…
... from 128k
0xA000 RAM RAM RAM RAM RAM RAM RAM RAM RAM RAM RAM RAM RAM RAM RAM RAM
to (8k) 0 1 ... x 16k banks. Total ROM is 64k.
RAM is two physical ... or 16k banks. Total RAM is 128k.
RAM…Very odd problemHmm, loaded up Sanxion on another 48k+ I have here only to find that when it had loaded there were no enemies on screen, furthermore on loading Atic …
... could be quite a localised failure in that IC as the ... specific (and benign for a RAM failure), and would seem to rule ... out a multiplexer failure also?
BHelp! +3Just got my +3 working after replacing the drive belt. All was OK until I plugged in my Multiface 3 (known working with a +2a) and the computer went…
... steady green border indicates a RAM failure.
However the IC ... (Memory IC's are 4464 RAM, IC3-6).
Either ... way, if the RAM is socketed, grab a couple ...Spectrum Not Responding to Keyboard InputHello, sorry if this thread is not in the correct place, This is my first post and I'm not sure where to post this type of thread. :lol: Anyway, I r…
... would indicate a possible lower RAM failure (8 chips at the bottom ... the board), the latter a failure either in the CPU, or ... in the lower/upper RAM that is holding a data ... like the above when upper RAM is not behaving itself (machine ...Spectrum Not Responding to Keyboard InputHello, sorry if this thread is not in the correct place, This is my first post and I'm not sure where to post this type of thread. :lol: Anyway, I r…
... narrow this down to a RAM failure of some sort.
RAM from the system to narrow ...Spectrum Not Responding to Keyboard InputHello, sorry if this thread is not in the correct place, This is my first post and I'm not sure where to post this type of thread. :lol: Anyway, I r…
... narrow this down to a RAM failure of some sort.
RAM from the system to narrow ... of this, except the "upper" RAM chips are disabled, not isolated ... being pedantic? Well, sometimes a RAM chip goes faulty in such ...48k black paper white borderI recently sold a speccy to a guy, unfortunately the power supply didnt survive the trip, so on replacing for him it seems neither did the speccy! H…
... see it causing a lower RAM failure as there wouldn't be ... causes knock on effects to RAM voltages etc.
I ... day then suffer an upper RAM failure!
BSpectrum Plus display issueHi, does anyone know if this is fixable at all by someone with no experience? From looking on a similar post on World of Spectrum forum they mention…
... least one lower RAM chip are faulty here (a failure of one ... further guess is that the RAM failure is interfering with the data ...Spectrum Plus display issueHi, does anyone know if this is fixable at all by someone with no experience? From looking on a similar post on World of Spectrum forum they mention…
... example), I can tell RAM is working, but some ... may be faulty. Because RAM is used for CPU ... CPU cannot work correctly if RAM is faulty. There is ... if you short a RAM chip data output line ... />
As for mentioned RAM failure interfering with data bus: you ...New user with a dead 48k issue 2Hello all I've found my way here from watching some excellent youtube videos by Joulesper Coulomb in an attempt to fix a issue 2 rubber key 48k I bo…
... caused by lower RAM failure, or by a CPU failure. Less likely (although ... possible) is a ROM failure.
However the low ...RobikHello to all, Is anyone experienced on this russian clone? I have one at hand with corrupted screen (but it boots and replies to keyboard inputs so …
... the problem is in the RAM bank or the buffers/shift ... every memory location, as a RAM failure would suggest.RobikHello to all, Is anyone experienced on this russian clone? I have one at hand with corrupted screen (but it boots and replies to keyboard inputs so …
... the problem is in the RAM bank or the buffers/shift ... every memory location, as a RAM failure would suggest.[/QUOTE]
RAM memory, i don?t know ... it the voltages of the RAM.A tally on the number of successful builds of the Harlequin[SIZE=4][COLOR=Green][U][B]A tally on the number of successful builds of the Harlequin.[/B][/U][/COLOR][/SIZE] Please post your successes below :-) …
... . One of them reports upper ram failure every time with Z84C0008 installed ...Sudden death of ZX Spectrum 48KHello A friend gave me a 48K rubber keyed Spectrum. I brought it home, hooked it up to my little TV and powered it up. I was very happy to see t…
... simpler high or low RAM type selector, not near ... was supplied with a RAM upgrade kit, however. ... address connections for OKI RAM when the appropriate link ... remove the socketed upper RAM chips and power ... can rule out upper RAM failure if the Spectrum initializes ...Can you tell me some 128k visibly enhanced game versionsThis should be discussed before, but on search I get to many hits ... I´m more a 48k Spectrum-Man and never owned a 128k at my youth. A frien…
... half-functional 64k bit chips (total RAM = 48k bytes) to sixteen 64k ...Can you tell me some 128k visibly enhanced game versionsThis should be discussed before, but on search I get to many hits ... I´m more a 48k Spectrum-Man and never owned a 128k at my youth. A frien…
... half-functional 64k bit chips (total RAM = 48k bytes) to sixteen 64k ...can a backup device damage the spectrum ROM?as above. been using a specmate device which seems to have corrupted my speccys ROM.
...
Failure of one or more 4116 "lower" RAM chips is ... (Z80, ULA, ROM, RAM) can potentially be damaged... So ... which has a comprehensive RAM test program, even ... all on their own. RAM failure is far more common ... than ROM failure. Your machine may be ...ZX Spectrum +3 repairI have my first +3 here, and it needs repairs. Hoping someone here can help me out. When I power it on I get this screen with black and white line…
... chips (including the ROM and RAM) in the system
[/list ... , control or data bus failure, ROM failure or RAM failure will most likely result ...Can I fix it?This PC was stored in a the spare bedroom at a jaunty angle of 30 degrees for several months. I powered it up today and was greeted with a 1..2.3. b…
this http://www.tomshardware.co.uk/forum/96993-30-beeps-pause-repeat says it could be ram failure?
if you have 2 in, try both singularly, or if you have another stick that in see what happensThe 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
... is also interesting that RAM pack wobble and other ... a common cause of lower RAM failure , I got a ... in showing up lower RAM failure though I cannot be ... wobble from the Cheetah RAM pack I got with ... upfront initial RAM upgrade risk 2) ongoing Ram pack wobble ...How can I fix a problematic Retroleum Smart Card. I did not do anything "WRONG " with it but I did but it on a flexible cable and this seems to have "upset" it .Since then It does not perform the …
... this . It said lower RAM was OK . Upper Ram failure at $FFFE .Then ... colour palette test confirms upper RAM error encountered . Suspect IC21. IC ... IC21 and what caused the failure ? Does it need a recap ...Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... I started , as the lower RAM failure shown with the IC21 chip ... speak with just the upper Ram problem.
This ... was retested it shower upper ram failure at IC15 ,IC16 ,IC17 ,IC19 ... . So something had caused lower RAM failure this time What a useful ...If Sinclair computers had not been sold...I was just having a random thought. If Sinclair Computers (or the rights to them, not sure how it 'worked' back then) had not been sold to Amstrad…
... machine with 64k bytes of RAM,
[*]Make a machine ... with 80k bytes of RAM (imagine the marketing, more memory ... eight 64k bit DRAM chips. Total RAM = 64k bytes.
If ... the upper RAM, you get: 16k (lower RAM) + 64k (upper RAM, some of ...doubt about swapping ULA in an issue 2 boardIs it possible to swap a 6C001E-6 ULA type with a 5C112E ? I have this issue 2 board that is not booting, it shows me a black border with horizont…
... but DiagROM gives me lower RAM errors, it says all lower ... RAM is faulty, or bad ... the 7805.
RAM IC's are MM5290N
I replaced just one RAM with a modded 4164 ( ... shows me an entire lower RAM failure.
I'm ...128K refurb.... What is the best way?Here's the latest Spectrum I got... Finally got a Toastrack... Not sure if it was good value ( around US$100 ). [img]https://os.blackice.com.au/us…
... seems to be doing the RAM test and hitting the infinite ... . Also I've replaced the ram and have gone from permanent ... to the oscilloscope suggest a RAM failure still, but I'm not ...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…
[quote="Your Spec-chum;982380"]Ram failure of IC21[/quote]
There is no IC21...
RAM chips are IC3, 4, 5, and 6...
