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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 -
Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…
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I found its voltage regulator not to be working ... br />
The lower RAM chips are marked ITT 4116 ... RAS signals at all RAM chips (upper and lower ... and input pins of all RAM chips
(upper ... WE is ~5V at all RAM chips (upper and lower).
Hires Opus Discovery picturesAs I had the rare and awesome opportunity to be able to buy 5 or 6 Opus Discovery interfaces this year, and because I couldn't find hires pics of the…
... didn't have a 6116 ram chip, don't know if ... different ways of how the voltage regulators are mounted
- there ...Issue 2 voltage troubleDear all, I got my hands on an old issue 2 from a friend. Price was close to zero so I did not hesitate to take it. After powering it up I was sur…
... conditions. Temperature of the lower RAM seems to be not unusual ... or that some of the RAM or capacitors has a short ...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. …
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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 reset on 48K (issue 4S)I'be been fighting an intermittent selfreset the whole day. Changed ULA - did not help. Tested TR6 as i could and compared the reading with another…
... a short program. For example RAM test from the archive (which ... is in german). It runs RAM test okay. Nothing bad happens ... fine.
Looked at the voltage with a oscope. Pretty calm ...Spectrum 48K help neededI hav got an old Specrtum 48K issue 3. When I plug-in power connector it doesn't show the home screen (c) Sinclair.... From about 50 times trying to …
... I check if is the RAM or ULA?
When ... degress celsius), the RAM remins cold. I have checked voltage lines (+5 ...Issue 3 power problemHi all, I have an issue 3 board with an odd power problem, I have no -5V in fact, measuring the voltage on this line leads to a surprising result : …
... -5V in fact, measuring the voltage on this line leads to ... TR4 & TR5, as faulty RAM can often take these out ... -5V decoupling caps for the RAM, just in case one of ... to anywhere other than the RAM ? as that might be a ...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 ...THE VOLTAGE OF THE POWER SUPPLY UNITCould anybody who has a ZX Spectrum 128k +2 count with a voltameter the voltage which the power supply unit gives to the Spectrum and tell me the [B]…
Could anybody who has a ZX Spectrum 128k +2 count with a voltameter the voltage which the power supply unit gives to the Spectrum and tell me the [B]exact[/B] reading?Semi-Dead Spectrum - Help RequestedI have finally got my hands on my two old Spectrums - neither of which work, but ideally I hope to get both of them working again. Spectrum number o…
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I have replaced the Voltage Regulator and the Spectrum now ... I be looking at a RAM fault?
Ideas anyone ...Lower Memory - Why Multiple Voltages?Having spent much of the weekend working on getting my old Spectrum working, my Dad (who is visiting) and I were chatting about the schematic. Given…
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Given that the upper RAM in a Spectrum is of ... - which only has a supply voltage of +5V, why on earth ... in the lower portion of RAM?
Surely it would ...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 …
Does anybody know or have reference to technical docs, how no contention on RAM access is achieved in Pentagon 128K clone ?
Looking at schematics it has to be simple solution, probably king of interleaving, but I could not find any details.Joystick Interface with built in RAM expansion?Is there such a thing as a RAM pack with a joystick interface built in?
Is there such a thing as a RAM pack with a joystick interface built in?Issue 2 video problemHello all, Need some help with an issue 2 board that I 'm trying to restore. I've replaced all the electrolytic capacitors, changed the voltage regu…
... the electrolytic capacitors, changed the voltage regulator, tr4, and a Zener ... the board came to life. Ram is ok and my divide ...CAT!RAM and PUTRAMLast year sometime I posted a couple of routines to: * catalogue the 128k RAMdisk in BASIC; * move RAMTOP and the stacks from BASIC. CAT!RAM and PUTR…
... from BASIC.
CAT!RAM and PUTRAM are updated versions ... />
As CAT!RAM is in BASIC and is ... swapping around RAM pages to get at ... threshold.
CAT!RAM prints file name & type ...
The listings follow. CAT!RAM will work on any 128k ...Lot's of ZX Spectrum parts: RAM chips, ULA's, etcI have new stock of 100% tested parts. I even got my hands on a bunch of ULA's!! [IMG]http://benophetinternet.nl/hobby/sales/parts/IMG_6068.JPG[/IMG…
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Prices:
- Ram chips: 4164, 4532, 4116, etc ...
