-
Another 48k Speccy acting as a 16K model.Hi all, I originally was going to post asking for help to fix the new addition to my family a very nice condition Issue 2 sold on ebay as a 16K model…
... the logic and upper ram is socketed then its a 16K thats been ... to set it as a 16K model? now to source an ... -
Another 48k Speccy acting as a 16K model.Hi all, I originally was going to post asking for help to fix the new addition to my family a very nice condition Issue 2 sold on ebay as a 16K model…
OKI RAM is not supported by the ... appears you must have OKI RAM chips which function as fully ... a 48K machine functioning as 16K, enter the following commands:
upper RAM IC's are faulty. -
Another 48k Speccy acting as a 16K model.Hi all, I originally was going to post asking for help to fix the new addition to my family a very nice condition Issue 2 sold on ebay as a 16K model…
... a 48K machine functioning as 16K, enter the following commands:
upper RAM IC's are faulty.[/quote ... just giving responses for a 16k model which was really confusing ... just returned answers for a 16k spectrum not a faulty 48k ... -
Upper memory not available in issue 2A friend send me his issue 2 Spectrum for diagnosis. It boots okay but for some reason won't load games over 16kB. He sent also a Smart Card with int…
... got, it eventually had several upper memory faults, ended up ... replacing the whole upper memory but the main and ... my case I had OKI upper ram, I connected the link ... and bodged, got a upper memory kit from Retroleum replaced ... only 'act' as a 16k model. -
Spectrum Next in the ArchiveWhen the Spectrum Next is launched, should it be added to the archive, and games archived as per usual WoS usage? There are a lot of new games annou…
... program that works on 16k speccy but not on ... there's more than 16k mem and fail)[/quote]< ... system memory locations. The RAM in the Spectrum is continuous ... from the non-existent "upper" RAM to determine if the ULA ... is reading data from RAM in order to "draw" ... -
ROM emulation in softwareHi, first of all -- I only have shallow / uni knowledge of hardware, electronics, and physics. So forgive me for asking things that are out of that …
... write to the "lower" 16k RAM area (which contains the ... two long, the "upper" RAM will not have time ... or all) of the "upper" RAM may loose any data stored ... program into the "lower" RAM, then once the new ... The Sinclair ROM clears all RAM anyway...
... -
ZX Spectrum 48K it only shows colored barsHello, I'm new to the forum and I need help with a ZX Spectrum 48K which I bought recently unfortunately defective. I want to mention that before t…
... , most likely it is okay. Failure of ROM chips is very ... IC22, 32k bit DRAM, expansion/"upper" RAM (machine will start without it ... /> IC23, to IC26 controls expansion/"upper" RAM (machine will start without it ... -
Memory Contention: A Hypothetical Fix?I have just had this crazy thought: If one were to wire an additional memory chip, say a 6264 8Kx8 SRAM, in parallel with the main memory so that it …
... 16k RAM and the Z80 CPU bus (with the Z80, upper RAM ... to access the lower 16k even though it is ... or reading to the lower 16k of RAM.
But ... the lower RAM to some new "screen" RAM during the time ... only reads from this new RAM.
This ... -
Spectrum +2 grey ear mod?Is it possible to turn the sound port on the back of a grey Spectrum +2 into an ear input? I know it's possible for the black +2 but I can't find muc…
... actually decodes the internal RAM as a 16k byte area. But ... because the internal RAM chip(s ... that an area of upper RAM in the memory map ... fetches from the area of upper RAM in the memory map. ... it will only see 16k of RAM at first. There is ... -
problem loading/playing gameshello to all! i was last active at this forum 11 years ago, and here goes the same thing :) found my old speccy, did the composite mod, managed to …
... ="Ast_A_Moore;927726"]No, the lower RAM is there. It’s the ... the lower left corner. The upper RAM and at least three other ... issue 3b boards with only 16k of memory... thought that all ... -
Working with TRD and SCL files in WindowsI'm fiddling around with my games-in-progress, trying to get them working on Pentagon 128. As part of that, I need to get my head round TR-DOS and ma…
... that switches between upper RAM banks and loads a 16K block into each ... -
Help with a TIMEX TC2048 and memory problemBought a 2nd hand Timex TC2048 but unfortunately I detected a problem with the machine which is preventing it from working properly. I believe it …
... One pair will give you 16k bytes.
... /> 3FFF hex is the 16k bytes of ROM
... first ("lower") area of RAM
8000 ... the next area of RAM (half of the "upper" RAM).
RAM (the remaining half of the "upper" RAM).
... -
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 …
... clarification: the "upper" RAM chips only need a ... a reference voltage. A failure of the +5V supply ... />
The 'lower' RAM chips (type 4116 or equivalent ... present can damage the 4116 RAM chips.
... likely caused by a faulty RAM chip.
More on the Cheetah RampackI should be more careful about doing "repeats" ( I should learn some manners) but I could not find anything recent on these . But here is on WOS …
... on the DK Issue 2 16K ZX Spectrum and on the ... to see "Lower RAM error at 57FFB " And "32K Upper Ram OK" ( I ... OK) .Then it said "Lower Ram error encountered ". Two of the ...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 …
... ) and it showed that the upper 32K Ram was fine .
16k Issue 2 1982 ZX spectrum ... booted up using the Interfaced Upper Ram . So that is what I ... -chipped or a de-chipped 16K Spectrum . The socketing looked to ...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 also interesting that RAM pack wobble and other edge ... common cause of lower RAM failure , I got a 16k one recently . The ... job in showing up lower RAM failure though I cannot be sure ... 1) upfront initial RAM upgrade risk 2) ongoing Ram pack wobble risk ...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
... about an Issue 2 16k board that was an ... I've already brought an upper ram module from Retroleum. The ... of your questions about ram modules. I have a ... replacing previously fitted faulty ram, then you have to ... current draw with the ram modules though. Other than ...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
... the ‘lower’ 16k bytes of RAM, or the ‘upper’ 32K bytes ... of RAM.
For the ‘lower’ 16k ... bytes of RAM ... ),
[*]Use a upper RAM replacement module (there are ...Best 16k Games?Thought you guys might like this over on Retrofusion :smile: [URL="http://www.retrofusion.org.uk/article/722/1/top-ten-16k-spectrum-games/"]top ten …
... a 16K machine (presumably as the code is loaded into upper ram), do ... these two classics count as stealth 16K games?Issue One (2020)My version of the Issue One PCB under development: [img]http://fotogalleria.info/pub/ZXSpeccy/IssueOne/ZXi1_PCB_01.jpg[/img] [img]http://fotoga…
... only has provision for 16k bytes of RAM on board. For the ... of expansion/extension (normally called ‘upper’ RAM nowadays), you plugged in an ... machines sold would be the 16K base model...
[b ...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 ... RAM, and use 64k bit DRAM for the upper RAM, you get: 16k (lower RAM ... ) + 64k (upper RAM, some of ...upper ram tacks / TR4 socket...[url="https://photos.app.goo.gl/MkqzRCuNCV3EPr9E7"]https://photos.app.goo.gl/MkqzRCuNCV3EPr9E7[/url] you can only replace that pesky TR4 so many t…
... .com/2019/08/zx-spectrum-16k-48k-and-plus-models-dc ... program does need some working RAM...
If there is ... may want to use a upper RAM replacement module. But before fitting ... broken connections), all the wanted RAM address lines are connected and ...If you had four roms...Just wondering if you were designing a Spectrum from scratch, and you used a 27512 EPROM, which would hold about 4 spectrum roms, what you would inst…
... the line editor of the 16k/48k/+ machines, but is ... ’s nice that the ‘upper’ RAM can always be used at ... 16k bytes, the top 8k bytes, or allow paging of this RAM ... in the first 16k in the ROM ... map (all RAM) paging out the screen RAM as well? ...Paging for 64Kb of Video Ram??? What is the best way to page this?Hi all, I'm just putting together a concept card for a "Loki" style of video card, which supports shadow ( so it fits a normal Speccy ) and also t…
... the entire screen block ( well, 16K of it... ) since it's ... was reading it from the upper memory area above 4000.... That ... wouldn't interfere with the upper RAM, would make it 48K compatible ... be to just replace the upper 8K or the ROM which ...Max RAM for ZX Spectrum gamesHow much RAM can be used for single level/whole game? On tape writing.
... difference between contended and uncontended RAM is a hardware thing.
16K machine, this is all the RAM there is. This RAM is ... an extra 32K bytes of RAM. This ‘upper’ RAM is uncontended. The Z80A ... the 128K models, the ‘lower’ 16K which has the screen data ...Method to read byte as binary string rather than dec?Hi all Am fiddling around with the screen buffer and have written a routine to scan the screenbuffer into upper ram and then write it back in upside…
... to scan the screenbuffer into upper ram and then write it back ...Note to SpiranthoIan Whilst playing about with Frankenspec, I have discovered that the 41256 memory IC works as well as a 4164 (etc) in the upper RAM block of a 48K …
... a 4164 (etc) in the upper RAM block of a 48K machine ... />
Strapped for OKI L RAM, the NEC chips worked just ... work if strapped for TI RAM etc.
Lloyd ...Component Equivalents/substitutionsA while ago, I mentioned to somebody in a thread that we should have a list of component equivalents and substitutions so that it's easier to fix our…
... (Inmos) chips work in any upper RAM position (IC15-22)
... work in place of 4164 upper RAM chips
V53C256P80L chips ... work in any upper RAM position (IC15-22)
MN41257 ... -12 chips work in any upper RAM position (IC15-22)
...
