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Test single ram chips?Is it possible to test single ram chips? Micky
Is it possible to test single ram chips?
Micky -
4116 ram chipsI need some ram chips to fix my 48k + issue3b, I have done the composite video mod and it works, now i just wanna play games on it but its stuck on r…
I need some ram chips to fix my 48k + ... advised to replace the lower ram chips. I can't test ... -
Making BASIC occupy less RAM?I risk being told to search the forums and the entire archive of type-ins, but here it goes... Is there any known utility to do all the hard work of…
... a BASIC listing in high RAM, and then a routine in ... "uncompressed" listing would fit the RAM just fine. How would I ... -
Ram joystick interface and Competition ProMy Ram joystick interface does not work probably with a Competiton Pro joystick with autofire (on a ZX 48K). Is this normal? My Competition Pro wit…
My Ram joystick interface does not work probably with a Competiton Pro joystick with autofire (on a ZX 48K). Is this normal?
My Competition Pro without autofire works very well.
Micky -
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…
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 compatible RAM).
Thanks,
Thomas -
zx81 internal ram upgrade?just curious if others have? I mean can you just rip the memory out of the ram-pack and use that.. as I'd rather just have the unit upgraded interna…
... the memory out of the ram-pack and use that.. as ... -
LDIR timings in contended RAM?The 48K Spectrum technical reference page ([URL="http://www.worldofspectrum.org/faq/reference/48kreference.htm"]here[/URL]) describes the detailed ti…
... the detailed timings of contended RAM. It gives timings for Z80 ... in, or reading/writing, contended RAM.
I can decipher ... 48K, or double buffered -- paging RAM bank 7 into a 128K ... -
48 Issue 3b working but very hot ula and cpuSalve to everybody I bought from e*ay an Issue 3b 48k , fitted in a + case. Fixed the keyboard problem with a new keyboard membrane from good Rwap (w…
... is hot too. And all ram chips are slightly warm. All ... a symptom of other parts failure (caps, transistor ?). I noticed also ... -
Loss of innocenceI suppose my ZX Spectrum era lasted longer than most (although not sure longer than most of you on here). I received my first Speccy back in '83, and…
... amazing. A real keyboard, 256KB RAM. A different colour per-pixel ... /> I felt like such a failure. I had cheated on my ... -
48K Speccy Repair Log.Some people may know my love for writing up my repairs of arcade PCBs on various forums so thought I would do the same for this little fella. Had th…
... .
The upper RAM, from 32KB to 64KB on ... away. Going over the RAM chips with the scope I ... Interface 2 which has a RAM test, the original fault ... and the short ram test failed with "RAM Error @8000 BTS ... BTS 8 means that the failure pattern is 8 in hex ... -
The incomplete Contact Sam Cruise RAM disassemblyThe incomplete Contact Sam Cruise RAM disassembly is now up at pyskool.ca: [url="http://pyskool.ca/disassemblies/contact_sam_cruise/"]Browse online[…
The incomplete Contact Sam Cruise RAM disassembly is now up at ... -
How the spectrum generates the video from ramHi everyon, I know that most people here allready know this but i think i found out how the spectrum acctually dispalys stuff and why the LD x, (HL)…
... assign the first K of ram to video memory and the ... is accessing the higher order ram (> 16K) the ULA (or ... -
Win2003 tweaking to make better use of lotsa RAM ?I have a server running Win2003. This machine is fitted with 4 GB of RAM, which is far more than strictly required. It only runs a few apps, and is …
... fitted with 4 GB of RAM, which is far more than ... " 2 GB of the available RAM without losing any steam.
RAM at startup to reduce the ... -
Speccy boxes with no RAM markingHi people, I noticed the other day that my Issue 1's box is different to the others. All the other boxes have "16K RAM" or "48K RAM" printed on them…
... other boxes have "16K RAM" or "48K RAM" printed on them in ... all, but has a "16K RAM" sticker on one end only ... -
Spectrums with gold RAM chips?Hey people, This is a first for me: [img]http://www.mutant-caterpillar.co.uk/ian_stuff/blingspeccy.jpg[/img] Is it normal to have gold RAM chips? …
Hey people,
This is a first for me:
[img]http://www.mutant-caterpillar.co.uk/ian_stuff/blingspeccy.jpg[/img]
Is it normal to have gold RAM chips? I've not seen this before! -
Cheetah 32K RAM PackI acquired a Cheetah 32K RAM Pack this week and took it apart to give it a clean. Unusually all the identification marks on the top of the chips hav…
I acquired a Cheetah 32K RAM Pack this week and took ... .org/Vintage/Sinclair/82/Peripherials/Ram%20extensions/Cheetah%2032K%20Rampack/PCB ... -
changing extended RAM pages in SpinIs it possible to edit the data in 128k extended RAM pages in Spin? I've tried both the debugger tool and the pokes tool and, although they let me ma…
... the data in 128k extended RAM pages in Spin? I've ... -
128K+2A/+3 RAM layoutDoes anybody know how physical RAM is mapped to ZX 128k+2a/+3 address space ? There are four 64Kx4 chips IC4-IC7. IC4-IC5 seems to be contended (vide…
Does anybody know how physical RAM is mapped to ZX 128k+ ... be contended (video RAM). It would mean RAM banks 4-7
RAM test program, can be on ... -
128k RAM paging from BASICI'd always thought that OUT had to be used to page RAM, which from BASIC would be an "OUT 32765,ddd" command, although I don't know if just doing tha…
... to be used to page RAM, which from BASIC would be ... -
File size in 128K RAM diskHi Folks, Is there a way to get the size of a file stored in the 128K RAM disk from within a BASIC program? Many thanks Paddy
Hi Folks,
Is there a way to get the size of a file stored in the 128K RAM disk from within a BASIC program?
Many thanks
Paddy -
ISR's in lower ram, a.k.a. the snow effect - did any game or demo ever use this?Hi all I've been curious to see what the 'snow effect' looked like in real life for a while now so today I wrote a quick IM 2 ISR in lower ram to wi…
... IM 2 ISR in lower ram to witness it firsthand. Pretty ... -
Ram Turbo compatibilityThe Ram Turbo interface, couple of joystick ports (iirc they can be Kempston too) and a IF2 style cartridge slot. This one > [url]http://www.worldofs…
The Ram Turbo interface, couple of joystick ... -
zx81: is there a 16kb ram limit for basic?first of all, sorry to all about posting a question about zx81 in a forum mostly about zx-spectrum - i didn't want to offtopic questions here anyway,…
... time were only predicting 16kb ram extension, and this may the ... 32kb, 48kb or 56kb of ram? -
Difficult to find upper RAM fault.I've recently repaired an issue 3B 48K Spectrum that had a tricky to diagnose upper RAM fault, so I thought I'd post a report of what I found here. …
... br />
Next, the section RAM-READ begins examining and modifying ... each possible RAM location, from low to ... passed from testing lower RAM to upper RAM. Here is an example ... routine passing from lower RAM to upper RAM, but I did see ... -
Inefficient code in ROM, from ram-check to RAM-DONEHere is the inefficient code: [CODE] ;; ram-check L11DA: LD H,D ; Transfer the top value to the HL register LD L,E …
... ; pair.
;; RAM-FILL
L11DC: LD (HL ... JR Z,L11EF ; forward to RAM-DONE if faulty.
< ... />
[CODE]
;; ram-check
EX DE,HL ...
;; RAM-FILL
L11DA: LD (HL ... -
4116 Ram chip replacements?Hello. I am in the work of gathering replacement parts for my speccy 48k. And I would like to know what chips is good replacement for the 4116 ram ch…
... good replacement for the 4116 ram chips, and where can I ... -
Intermittent sound cutting outHello, I'm resurrecting an old rubber key spectrum. Originally it had no sound at all, diode D9 was blown, I replaced it with one from my other dead …
... works but it's randomly intermittent. It doesn't fade up ... -
Issue 1 ram connectors....Hi Does anyone have the pinout of the Issue 1 internal RAM connectors, for the 16K-> 48K upgrade board, as I'd like to try and make myself a board, a…
... of the Issue 1 internal RAM connectors, for the 16K-> ... -
RAM Turbo without a slot?Hi! I got this RAM Turbo joystick interface which surprisingly came without a cartridge slot inside. Would there be any reason someone should cripple…
Hi! I got this RAM Turbo joystick interface which surprisingly ...
