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Looking for some 48k RAM (upper 32k bank)Greetings, I was wondering where I could find some upper RAM for a 48k (issue 4A). It's the Texas Instruments TMS4532-20NL4 P8419 (or any compatib…
... to the OEM RAM.[/quote]
Go for 100/150ns if possible ... CAS delay generated by the RAM managing logic may not be ... why some of these upper RAM would just fail?[/quote]
Those RAM are actually 4164 RAM's with a defective ... -
Recent talk of developing new SpectrumsHi all, I can see from a few threads on here that some Wossers like Vasil and Aien 8 are interested in developing more powerful Spectrums or improvi…
[QUOTE=Alcoholics Anonymous;499468]Tying RAM speed to CPU clock is ... in 'page reads' (to avoid RAM wait states, remember the ARM2 ... faster than the 150ns speed rating of the 4116 RAM. DRAM effectively ... access data within a specific RAM page).
And ... -
What paging scheme is the "standard" for 128K models?Sinclair implemented an arrangement so that even numbered pages are non-contended, and odd numbered pages are contended (quoting from memory, haven't…
... .
The RAM is being accessed all the ... suggests that all the RAM signals are controlled by ... the fact that the RAM is constantly accessed for ... ROM, suggests that the RAM address and data buses ... ). The RAMs used have 150ns of access time, so ... -
Issue 3B only sees 16k (and RAMTOP NO GOOD on loading)A ZX+ with issue 3B board that i got recently, does not see anything more than 32768 (sometimes 37267..) on "PRINT PEEK 23732 + PEEK 23733 * 256 (Ent…
... top etc.?[/quote]
Use 150ns or faster chips. Don't ... recommend to you to buy 150ns chips or faster. For upper ... more (or all) the upper ram is dead?[/quote]
Based ... , bad chips?[/quote]
- Upper RAM exposes their data bus on ... -
Pentagon RAM memoryDoes anybody know or have reference to technical docs, how no contention on RAM access is achieved in Pentagon 128K clone ? Looking at schematics it …
... i 200ns.
Well, then RAM speed is not advantage here ... if not all ZXes have 150ns 4116 chips. The trick has ... -
What do this modification ?Hi All, I get from ebay black 2a, I open to clean case and show ... this [IMG]http://forest.no-ip.org/wos/2a.jpg[/IMG] what do this modification ? …
... = 169ns . Are original ROMs 150ns chips?
- RAM timmings are handled by ... -
another faulty zx spectrum +2 to fix!!!Hello to all, I'm new here... I have got a faulty +2 (gray) and start to try fix it... I have read the treads of xaris_sm and Pluto63 as background…
... -150ns chips, so I don't see reason to use slower RAM ... still ok, even for video RAM, but access time is only ... -
Which ULA?Just a quick question, more of interest rather than immediate need... I am thinking ahead about the repair of an Issue 2 board, and also an Issue 6A …
... and z80 with confidence, lower RAM with less. I suspect I ... of Zorn's replacement Lower RAM boards in the near future ... find 4116 150ns chips anywhere. However, none of the lower RAM chips ... -
Which ULA?Just a quick question, more of interest rather than immediate need... I am thinking ahead about the repair of an Issue 2 board, and also an Issue 6A …
... find 4116 150ns chips anywhere. However, none of the lower RAM chips ... , the ULA, the ROM, the RAM combined that process keyboard inputs ... -
Seen any ebay madness?? post it here !!!What with some high prices fetched on speccy games over the past few days , thought it might be an idea to keep a WOS record of some of the higher fi…
[QUOTE]KM4164B 150ns 64K Ram chips Quantity 25 - brand new, ... -
+2 Gray ProblemI'm trying to repair a +2 gray that behaves differently at every boot up. Some rare times I can get the selection window but pretty soon the characte…
... . I pulled IC22, ran the RAM tester and got this:
The RAM tester also seems to flag ... just need some 4164 RAM that's 150ns rated or better to ... -
Speed (nano seconds) of memory chips ZX SpectrumThe ZX Spectrum uses 4116 memory for the lower memory, which can be replaced by other sorts or a whole, modern, module, but when searching for 4116 m…
When talking about RAM chip speed, often only one ... />
If a slow RAM chip is fitted, the computer ... DRAM chips should be the 150nS type. Ian Worsley's ... 200ns for the "upper" RAM. Faster DRAM chips are fine ... marked "-15" may mean 150nS or it for a more ... -
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…
What kind of lower RAM chips have you installed? They should have 150ns access time (4116-2N type). 4116-3 are slower and their access time is 200ns.
Are you sure that Z80 CPU is fine? -
Lower & upper ram IC's for an issue 3 please.Would any of you great folks have 1 spare lower ram, and 1 spare upper ram IC's you would be willing to sell. I'm fixing up a poorly Spectrum that is…
I'm sorted for the lower ram just need the upper ram IC.
Is there any drop-in replacements for the TMS 4532-15NL4? Would a Samsung 4164-150NS work? -
Lower & upper ram IC's for an issue 3 please.Would any of you great folks have 1 spare lower ram, and 1 spare upper ram IC's you would be willing to sell. I'm fixing up a poorly Spectrum that is…
... 've brought a replacement lower ram IC from Mutant Caterpillar, and ... of Samsung 4164-150NS for drop-in replacement upper ram IC.
Emulator compatibility with real SpectrumHi emulator programmers... Having spotted for the last 6 months that my iPAQ is still missing a Spectrum emulator I started typing last tuesday - an…
... the lower part of the RAM is slower because of the ...a questionwho can tell us the peek-poke address of the ZX Spectrum Ram Top??
who can tell us the peek-poke address of the ZX Spectrum Ram Top??Z88I Have a Working Z88 complete with 128k EPROM Pack, 128K RAM Pack, Soft Carry Case, PSU, Printer Cable and Manual. I also have Spare:- 1 off 32K…
... with 128k EPROM Pack, 128K RAM Pack, Soft Carry Case, PSU ... :-
1 off 32K RAM Pack
1 off ...I have...I still have a working ZX-81 plus 16k RAM pack, still in it's box. I also have a ZX Spectrum 48k computer with the Sinclair Microdrive (plus Microdr…
... working ZX-81 plus 16k RAM pack, still in it's ...Didaktik M (ZX Spectrum clone selling)Here is an offer to buy ZX Spectrum clone ( DIDAKTIK M ) from Slovakia, basic info: 100% functionality, Kempston & Sinclair joysticks connectors, tap…
Here is an offer to buy ZX Spectrum clone ( DIDAKTIK M ) from Slovakia, basic info: 100% functionality, Kempston & Sinclair joysticks connectors, tape device connector, TV and VIDEO out, 48kB RAM/ 16kB ROM. Price GBP 50.what spec pc are you running your speccy emulator onAll them giga hertz and bytes and what do i do with it mainly...play speccy games and old arcade games.. What spec pc do you have at the moment? I up…
... upgradem,,
it got 256mb ram,,8.4 gig hard drive ...ZX81 Emulator (HARDWARE FREAKS NEEDED!!!!)For the ZX Spectrum I have programmed a ZX81-emulator. ZX81 games can't run directly on a ZX Spectrum due to memory adresses used by the Spectrum (li…
... 16384 is part of ZX81 RAM to load a program. The ...2 days Meeting in Holland 27-04-2002 and 28-04-2002For you who were not there, a short compilation! "Moorhuhn", the addictive internetgame which keeps 1000's of Germans out of work is released for th…
... -Spectrum can be rebuilt with RAM at ROM adresses on the ...Character set variableCan anybody help me? I'm trying to find out where the pointer to the ascii character set is. I remember that if you wanted to change the font on the …
... put your own font in ram somewhere, then change a 2byte ... pointed to your font in ram, instead of the default font ...ROM cartridgeI forgot, I'm also after a cardridge to fit into my RAM Turbo interface, mainly to see if it works really. An ultimate one would be nice, but would …
I forgot, I'm also after a cardridge to fit into my RAM Turbo interface, mainly to see if it works really. An ultimate one would be nice, but would consider anything that works, Horace & the Spiders or whatever. Again, not desparate to pay a fortune!learning with the spectrumHello friends! When you load a game into the spectrum (i.e a game for the 48k), how can you guess where is stored its first and its last instructio…
... and its last instruction in RAM?? I know from 0 to ...How to play without POKEsI have a Speccy story, hope you will like it. It's about 13 years back. I was sitting in our living room and playing Dynamite Dan (part 1) on rubber…
... touched the connector and the RAM was without power for a ...ZX Spectrum Community ContributionThere is a new interface named MB03 under development(IDE,Flashcard reader,2MB RAM,etc).You can see it on Sintech website. The price of this interfa…
... development(IDE,Flashcard reader,2MB RAM,etc).You can see it ...Sharopolis's QuizHere you are folks, My quiz, edutainment at its best. This is the first quiz I've compiled so sorry if its too easy or hard or whatever. Some of the…
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12. How much RAM did the 128+ and the ...
