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Poorly Spectrum + Fault diagnosis help needed!Hi, I've got a Spectrum+. Sometime in the past I broke it and sent it off to be fixed. It came back working good as new, but with an issue 2 board i…
... the 4116 RAM is non-intermittently bad (i.e. not intermittent - I ... , it's been bad lower RAM. (That's not to say ... 't cause that, but 4116 RAM doesn't seem to age ... would suggest swapping the 4116 RAM for known good 4116 first ... -
more Spectrum uploadsHI all, just to let you know I've added some more stuff, including a white spec +, more keyboard development sketches for Geoff, Alpha Numeric pad, …
... a fairly high failure rate in silicon manufacturing of RAM, so instead ... as one device. Faulty / Dead RAM segments were disabled, leaving a ... -
more Spectrum uploadsHI all, just to let you know I've added some more stuff, including a white spec +, more keyboard development sketches for Geoff, Alpha Numeric pad, …
Interesting! I take it that this concept hasn't found its way into the modern RAM processing industry for whatever reasons? Probably b'cos the failure rate is much lower now I suppose... -
Question on Z80 R/W cycles.Snipped from the complete spectrum ROM disassembly: [CODE] Now the memory is checked. 11DA RAM-CHECK LD H,D Transfer the value…
... ).
To test whether RAM is present at all, all ... ... there's lots of interesting failure modes of the DRAM in ... -
Question on Z80 R/W cycles.Snipped from the complete spectrum ROM disassembly: [CODE] Now the memory is checked. 11DA RAM-CHECK LD H,D Transfer the value…
... errors, such as a partial failure internally with the row/column ... idiot tried a ZX-81 RAM pack on it - after which ... idiot with the ZX-81 RAM pack was me by the ... -
I want to build a new, super spectrum ;-)only kidding Andrew :-) my brain's going at a mile a minute at the moment, so I thought I should put some of the ideas down in case one of them is w…
... , which in turn kills lower RAM, which in turn can destroy ... . (Which in turn kills lower RAM. The TMS4116 datasheet says that ... it. But a wobble caused intermittent connection probably only affects a ... - one for lower RAM, one for upper RAM, which use a modern ... -
Speccy just snuffed it while playing 3D Pinball :(I have two speccys but the one I use most has just given up the gost! :-( game froze up and now all I get is flashing patterns and lines:-( Everyt…
... if it's dead upper RAM the Spectrum will still boot ... long as it's a failure mode that the Spectrum's ... supply can also kill lower RAM, and it's a really ... -
Testing the Ram on a Toastrack 128KHi All My "new" 128K is misbehaving, all the demos I have loaded for it crash instantly, Ghostbusters 128K is playable but one of the background scr…
There is a 128K RAM testing ROM, I've got ... enough. There's many failure modes of RAM which that test will ... succeed (such as if your RAM has become a 1 bit ... have a discussion of Spectrum RAM faults online here (this concentrates ... -
Free speccyAnyone want a speccy plus with leads and psu for free? I was going to do the comp mod on it so pulled it out to run it up before i started and it's d…
... - it's exhibiting some 'interesting' failure modes :-)
First off ... be a problem with lower RAM - but the bizarre thing is ... an artifact of how lower RAM has failed; the diags board ... way through (showing a lower RAM problem), and even run the ... -
Spectrum Dead On Arrival StatsDr. Rupe, who worked at Sinclair Research at the time, sees parallels with Microsoft and the XBox saga [url]http://community.zdnet.co.uk/blog/0,1000…
... most common failure mode seems to be bad 4116 RAM, I've ... amounts of moisture leading to failure; this isn't something Sinclair ... fixed though, just fit new RAM. Design flaws such as unrealistically ... -
Punch up! Bruce Everiss mauled by the internet over why Imagine collapsed.I couldn't see this posted here so I thought I would post it. It kept me amused for at least half an hour. Bruce Everiss on his blog claims piracy br…
... " was nothing more than additional RAM (or ROM) because that was ... published to cushion any potential failure) and it was going to ... that brings reward rather than failure. Well, if taking huge risks ... -
Black ScreenHi, Anyone know what would cause a 48k Spectrum to boot to a black screen? you can hear the internals buzzing at power up, but you just get a black…
... black screen as the RAM defaults to zero.[/QUOTE]< ... br />
The RAM defaults to a fairly random ... vomit' on turn on). RAM is cleared down to zero ... br />
If the RAM is faulty, it depends how ... failure modes so really you have to test the RAM ... -
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 …
... the most common failure modes of Spectrum RAM with that ... the 4116 lower RAM) the most common failure mode is ... known seed, then read RAM back, running the PRNG ... for bit fade, once RAM has passed the inversion ... fill tests, set the RAM for an inversion pattern, ... -
Spectrum+ - multiple issuesHi all Yesterday I picked up a Spectrum+ (via eBay) to add to my collection. Now, before any of the names I recognise from the last few months of l…
... membrane). Your upper 32K of RAM is also almost certainly bad ... test the upper 32K of RAM. You may need to run ... are faulty depending on the failure mode. A random fill test ... failed chips easiest. Remember Spectrum RAM is one bit wide, not ... -
Today's malware problemI've got Windows XP and am being greeted with the message that my computer is being shut down by "NT Authority System", and that there is a problem w…
... , the greater the chance of failure.
LINUX needs its ... , despite not really having enough RAM to run it. I honestly ... -
Broken ZX Spectrum? :(Hi! I bought a 2nd hand ZX Spectrum half a year ago. It worked perfectly fine when I first tried it. I put it back in its box which it was sent in, …
... can't used the video ram where spectrum put some information ... /> [/QUOTE]
Yep, a common failure mode :cry: You wouldn't ... keyclicks because non-working 'video RAM' (lower 16K) would make the ... -
Two dead SpectrumsHi all, Long time since I posted on here. I'm having a bit of a clear-out, and I've re-discovered two Spectrums I had in the loft : One is an orig…
... RAM is dead. 4116 memory seems to have quite a high failure ... - this will kill lower RAM too because lower RAM needs -5v supplying ... -
Welcomes...and some technical stuffHello I`d like to welcome all ZX Fans. I`m rather ATARI 8bit geek - I got this grat machine when I was 14...20 yeras ago... There were few ZX in …
The failure is very common (so it' ... /> 3. Modify the Spectrum video RAM bank so it uses 4164 ... -
Test ROM Cartridge For SaleI'm selling another load of gear including a Sinclair Research Test ROM Cartridge. [url]http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=4000772…
... RAM. This has been known to cause Spectrums to crash.
Failure ... .
Failure here may indicate that the RAM refresh is not ... RAM, and corruptions are reported. It could also indicate a timing failure ... full of text.
Failure will be when the text ... -
Ziggy 0.4The latest version of Ziggy is now available from the same link as before i.e [URL="http://ramtop.wordpress.com/"]here[/URL]. I've made changes to t…
... desktop (2.2Ghz, 1.5GB ram, ATI Radeon 9250) Ziggy is ... and it runs slow. :( The ram usage is bellow 30K but ... was slower than normal and intermittent. I could record it and ... -
Ziggy 0.4The latest version of Ziggy is now available from the same link as before i.e [URL="http://ramtop.wordpress.com/"]here[/URL]. I've made changes to t…
... desktop (2.2Ghz, 1.5GB ram, ATI Radeon 9250) Ziggy is ... and it runs slow. :( The ram usage is bellow 30K but ... was slower than normal and intermittent. I could record it and ... -
damaged spectrum+ (blinking squares)Hi, Sorry for my poor english, but I couldn't find on family forums any remedy for my hardware problem with my first speccy in my life :) I've bought…
... that serves video + lower 16K RAM chips (4116 or equivalent type ... ) TR4. Often followed by a failure of 1 or more of ... makes diagnosis of if/which RAM chips are gone, difficult.
Speccy repairs?I've finally got round to testing all the various Spectrums that I seem to have accumulated over the years and discovered that "my" two machines (i.e…
... br />
Most likely bad RAM also.
[quote]
Again, most likely bad RAM.
[quote]
[*]Seems ... />
With suspect bad lower RAM you also need to check ... data sheet explains why. The failure of this power supply is ...Whole upper memory lostHi! I own a rubber key Spectrum with 48K RAM. Suddenly it lost it's whole upper memory. All diagnostic programs says that it's 16K model with workin…
... works for you because the failure in your memory is caused ... RAS/CAS circuit inside the RAM, or the tri-state condition ...Whole upper memory lostHi! I own a rubber key Spectrum with 48K RAM. Suddenly it lost it's whole upper memory. All diagnostic programs says that it's 16K model with workin…
... admittedly, is a possible failure mode for RAM chip and/or circuit ... ] single bit failure is enough to declare a RAM chip failure. Since in ...The Ultimate Spectrum, made from old spectrumsGiven that all types of the Spectrum are less than ideal in one respect or another, I wondered what the ulimate refinement would be, but just using o…
... error, because its RAM system is prone to failure, and because it ...The Ultimate Spectrum, made from old spectrumsGiven that all types of the Spectrum are less than ideal in one respect or another, I wondered what the ulimate refinement would be, but just using o…
... error, because its RAM system is prone to failure, and because it ...Powering up a Speccy after long-term storage.Staying at my folks for Christmas. Feels good to be back in God's country again, even if it is -12C outside at the moment. :-o Anyway, I was plannin…
... damage the, yet fragile, lower RAM chips.
Therefore, it ... : your computer could be damaging RAM chips as time happens, if ... inmediately: there's a power failure in the internal DC generator ... not already) to the lower RAM chips.
- Try to be ...Hi everybody! Need help trying to rescue a ZX 48K...Hi, since this is my first post, a bit of info about me: I'm an Italian guy, now living in Poland (Warsaw), informatics and electronic geek since…
... /> The lower 16K RAM is more exposed to failure than the upper ... that some of the lower RAM is defective.
Check if ... any of the RAM-chips are hotter than the ... just have to replace the RAM and see if it helps ...
