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just speccy 128k HELP needed on parts listtrying to sort the parts needed to build one myself. but the parts list is a bit hard to follow at times and the creator is very busy. anyway thou…
Also note that some 4164 DRAM chips use 128 cycle 7 bit refresh (Z80 compatible) and some use 256 cycle 8 bit refresh (NOT Z80 compatible without extra circuitry).
[b][i]Mark[/i][/b] -
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
... it is):
[list][*]Use 4164 or equivalent DRAM chips (fit ... -
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 …
... be directly replaced with a 4164. Retroluem currently have some in ... -
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 ... -
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…
... one RAM with a modded 4164 ( i read this one only ... -
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…
... other issues, so maybe the 4164's I got are bad ... -
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…
... problems with the resin for 4164's and 41256's back ... .
Many of the 4164's made their way into ... -
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…
Yes, true. Thank goodness for the sockets. And yes, I bought up big... But half my rams are 150ns and half are 100ns... Still seems to work OK though. -
Anybody got a parts list for an Issue 3b please?I've got a schematic, but does anyone have a parts list with the values just for the resistors and capacitors? Just would save me sometime going thro…
... lower ram board or mod 4164 ram you could do away ... -
16pf Capcitors for C72/C73 issue 3b. Can I use 18pf?Looking at the service manual it states to use a 16pf ceramic disc capacitor in positions C72 and C73 on issue 3b boards. Is this very critical in bo…
... ram module replacement or some 4164 ram with small mod so ... -
Built a ZX Spectrum that works, but can't get the upper RAM to work?Like the title says I finished my Spectrum 3B board, and it boots, but it doesn't see the upper 32k of RAM. When it boots, the lower 16k works f…
what memory are you using ? even if using 4164 then the selection should still be set .. also if using 4164 is it 128 cycle refresh rate ? not sure about your program need to put my head on to understand it -
Built a ZX Spectrum that works, but can't get the upper RAM to work?Like the title says I finished my Spectrum 3B board, and it boots, but it doesn't see the upper 32k of RAM. When it boots, the lower 16k works f…
... you using ? even if using 4164 then the selection should still ... be set .. also if using 4164 is it 128 cycle refresh ...
