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Upper RAM replacement module issues with the DivideI got my new upper ram replacement module from Zorn yesterday and seem to be having some issues. When the machine is without the Divide it boots up …
... is what the "ZX Spectrum Upper RAM Module" plugs into. The module ... then supplies /RAS to the RAM).
What chip is ... -
Upper RAM replacement module issues with the DivideI got my new upper ram replacement module from Zorn yesterday and seem to be having some issues. When the machine is without the Divide it boots up …
... in place of the usual upper RAM. If 4532s/4164s operate correctly ... must still be driving the upper RAM's control logic correctly. The ... generation of /RAS for the upper RAM. I'd be surprised if ... caused a problem for the upper RAM module. It uses a high ... -
Upper RAM replacement module issues with the DivideI got my new upper ram replacement module from Zorn yesterday and seem to be having some issues. When the machine is without the Divide it boots up …
... think it is happening with Upper RAM module.[/QUOTE]
Perhaps ... the problem is that the upper RAM module latches addresses more quickly ... -
Issue 4A black paper, white borderJust had one of these through, nice yellow pcb! Everything but the ULA soldered in. On power up I get black paper, white border and some intermitten…
Turns out it was upper RAM after all! Strange how it didn't initialize into 16k though -
Issue 4A black paper, white borderJust had one of these through, nice yellow pcb! Everything but the ULA soldered in. On power up I get black paper, white border and some intermitten…
... balford said, some of the upper RAM may pass the initial test ... almost impossible to diagnose an upper RAM fault without removing all of ... -
Issue 4A black paper, white borderJust had one of these through, nice yellow pcb! Everything but the ULA soldered in. On power up I get black paper, white border and some intermitten…
The original problem was fixed (upper RAM), the new issue is that im getting a black and white picture through composite -
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…
... /> How do I disable the upper ram? Cut tracks? Ill take a ... -
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…
... normally appears when the lower Ram is broken or the 12V ... recognized that there is no Ram test using this Rom. Is ... price which works and has upper ram and may be address logic ... -
ZX Spectrum Plus Versions.Did they ever do a 16K version of the Spectrum Plus? I have just got an early one (Issue 3), with a low serial number 003-037776, and it is fully po…
It is most likely a normal 48K Spectrum+ that has developed an upper RAM fault.
You'll probably be able to work out which of the RAM ICs are faulty through a bit of poking and peeking. -
ZX Spectrum Plus Versions.Did they ever do a 16K version of the Spectrum Plus? I have just got an early one (Issue 3), with a low serial number 003-037776, and it is fully po…
... means that one ore more upper RAM ICs are completely dead, therefore ... read, you can determine which RAM IC is at fault. -
Video failureHi i cant find the failure of my spectrum 48k issue 4a, i thought it was ic6 or ic13 but the memory seem to have the right values. When i turn it on…
... I'll go for faulty upper RAM disrupting the initialisation.
upper RAM and so the ROM code ... only the lower 16K of RAM. The output of the voltage ... , I'd try removing the upper RAM ICs.
As always ... -
Power consumption improvementsHi all, Having just received lower and upper RAM replacement modules from Zorn, I thought I'd perform some current draw measurements to see how much…
... /> Having just received lower and upper RAM replacement modules from Zorn, I ... -
Power consumption improvementsHi all, Having just received lower and upper RAM replacement modules from Zorn, I thought I'd perform some current draw measurements to see how much…
... to do with the lower/upper RAM boards though, as others had ... -
Black Screen Spectrum 48kWas working ok, it came to me in a Fuller FDS keyboard, I had a nose inside and found a floating power lead connected to the keyboard, I removed that…
... , but I'd suspect faulty upper RAM. Try the following to see ... necessary to remove all the upper RAM ICs.
"Use a ... the /RAS signals for the upper RAM and so the ROM code ... only the lower 16K of RAM. The output of the voltage ... -
Black Screen Spectrum 48kWas working ok, it came to me in a Fuller FDS keyboard, I had a nose inside and found a floating power lead connected to the keyboard, I removed that…
... , but I'd suspect faulty upper RAM. Try the following to see ... necessary to remove all the upper RAM ICs.
"Use a ... the /RAS signals for the upper RAM and so the ROM code ... only the lower 16K of RAM. The output of the voltage ... -
Black Screen Spectrum 48kWas working ok, it came to me in a Fuller FDS keyboard, I had a nose inside and found a floating power lead connected to the keyboard, I removed that…
... but I'd suspect faulty upper RAM. Try the following to see ... necessary to remove all the upper RAM ICs.
"Use ... the /RAS signals for the upper RAM and so the ROM code ... only the lower 16K of RAM. The output of the ... I got a/some bad upper RAM chips ? -
Black Screen Spectrum 48kWas working ok, it came to me in a Fuller FDS keyboard, I had a nose inside and found a floating power lead connected to the keyboard, I removed that…
... your Spectrum has some faulty upper RAM. Now you need to identify ... [/URL]
Faulty upper RAM ICs can be replaced with ... -
32K Expansion board for issue 1 SpectrumI realise these are as rare as rocking horse poo, but I'd really like to upgrade my issue 1 and use it a bit more than is possible currently. Don't …
... also does one that does upper ram or did.. I was supposed ... sales bit for lower ram or low ram, or "sell my retro ... -
32K Expansion board for issue 1 SpectrumI realise these are as rare as rocking horse poo, but I'd really like to upgrade my issue 1 and use it a bit more than is possible currently. Don't …
... /> I have a lower and upper RAM module from Zorn in my ... issue 1 equivalent for the upper RAM but the likely market probably ... -
32K Expansion board for issue 1 SpectrumI realise these are as rare as rocking horse poo, but I'd really like to upgrade my issue 1 and use it a bit more than is possible currently. Don't …
ask him about it for the upper ram, think that thread mentions it.. as I wanted it , but also one that I could disable. -
Upper RAM replacement module issues with the DivideI got my new upper ram replacement module from Zorn yesterday and seem to be having some issues. When the machine is without the Divide it boots up …
... several Spectrums, all with the upper RAM module installed. I haven't ... can be used with the upper RAM module. -
My first composite mod.Thought it was about time I gave the composite mod a go. I used a youtube video, the bloke in the video took 10 mins, I took about 2 hours :) but it…
... , including Zorn's lower and upper RAM module replacements, a Recom regulator ... -
My first composite mod.Thought it was about time I gave the composite mod a go. I used a youtube video, the bloke in the video took 10 mins, I took about 2 hours :) but it…
... , including Zorn's lower and upper RAM module replacements, a Recom regulator ... -
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?
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DIY Issue 1 Internal 32K RAM expansionFollowing on from the information in [URL="http://www.worldofspectrum.org/forums/showthread.php?t=40173"]this[/URL] thread, I finally figured this ou…
... expensive than the lower and upper RAM modules I'm already selling ... -
"Freezes" on program loadingHi! I have ZX Spectrum+ (Issue 6A), and recently it has started to freeze w/o returning an error (but keyboard works) on program loading, regardless …
If the machine starts up ok, then I'd suspect an upper RAM fault.
Can you please follow the steps given [URL="http://www.1000bit.it/support/manuali/sinclair/zxspectrum/sm/sec4_2.html#memchk"]here[/URL] and report back.
B -
"Freezes" on program loadingHi! I have ZX Spectrum+ (Issue 6A), and recently it has started to freeze w/o returning an error (but keyboard works) on program loading, regardless …
... , then I'd suspect an upper RAM fault.
Can you ... I assume there's no RAM problem.
[scratches his ... -
"Freezes" on program loadingHi! I have ZX Spectrum+ (Issue 6A), and recently it has started to freeze w/o returning an error (but keyboard works) on program loading, regardless …
An upper RAM fault does sound rather likely.< ...
