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Broken ram or what?Hi! I own ZX Spectrum 48K. When i run command PRINT PEEK 23732 + 256 * PEEK 23733, I should get answer 65535? But i get 49151. In my machine the upp…
... test program which can test ram. It also says that machine ... has broken ram. And if i remove upper ... -
I've got Disciple Replacement IC'sI've got a GAL replacement for IC 8, and IC 9. I had a broken Disciple and it turned out to be the PAL20L8 (IC 8 ). PAL's are hard to find so I've bo…
I've got a GAL replacement for IC 8, and IC ... bought some GAL's as replacement.
Anyway if anyone ... -
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…
... br />
The upper RAM, from 32KB to 64KB on ... speccy, either as a replacement or a donor. Thankfully ... away. Going over the RAM chips with the scope ... 2 which has a RAM test, the original fault ... and the short ram test failed with "RAM Error @8000 BTS ... -
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 ... -
The best Explorer (file manager, not browser) replacement for Windows?There's a stack of utilities that claim to make Windows faster, or more reliable, or easier to use, but one type I've never really bothered with is t…
... really bothered with is the replacement file manager. These have always ... />
Does anyone use a replacement file manager? If so, which ... -
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 ... -
Replacement adapter needed for toycarA colleague fried up the american adapter for a toy car by placing a 110v adapter under 230v. Who knows a good replacement for it. Output = 7v DC 1…
A colleague fried up the american adapter for a toy car by placing a 110v adapter under 230v.
Who knows a good replacement for it.
Output = 7v DC 150 mA
Thanks! -
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…
... .
The lower RAM chips are marked ITT 4116 ... one is a
replacement (not by me and it ... looking RAS signals at all RAM chips (upper and lower).< ... and input pins of all RAM chips
(upper and ... - WE is ~5V at all RAM chips (upper and lower).
A great end to the ZX81 30th Anniversary Year2011 has been a really good year for the ZX81 and its 30th anniversary. We have seen new games: - A collection of 1K games with hi-res graphics - Bo…
... the ZX81 users:
- Replacement keyboard membranes
- The ZXpand ... SD-Card and 32K RAM interface
- The ZXpand-AY ...Replacement Rubber Feet for the ZX SpectrumWe have now purchased some more replacement rubber feet for the rubber key Speccy (and power supply) See [url]http://www.sellmyretro.com/offer/detai…
We have now purchased some more replacement rubber feet for the rubber key Speccy (and power supply)
See [url]http://www.sellmyretro.com/offer/details/Set_of_Four_Rubber_Feet_for_Sinclair_ZX_Spectrum_%28rubber_Key%29_or_PSU-1964[/url]New ZX-ULA2An upgraded / replacement ULA for the Sinclair ZX81 is now available. The ZX-ULA2 is a direct replacement for the standard ULA used in the Sinclair …
An upgraded / replacement ULA for the Sinclair ZX81 ... ZX-ULA2 is a direct replacement for the standard ULA used ... run in the 32K-48K RAM region of memory.
? Turbo ...Faulty rubber speccy - advice neededHello all speccy hardware gurus :) Recently I moved to a new flat and after a long time have some space (and time) to dig out my old Speccy hardware…
... power supply whose connector needed replacement.
But amidst ... somewhere between upper and lower ram chips... maybe even ULA...< ... that some of the lower ram chips have faultered. This ... motherboard had upper ram chips socketed so I pulled ...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 ...4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…
... components for using a static RAM IC to replace the lower ... RAM 4116s in a Spectrum. I ... , CPU access to the lower RAM seems to work perfectly. However ... bytes it reads from display RAM.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 ...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 ...7805 cooler replacement?I have been looking into finding some replacement for the 7805, since that single component generate a lot of heat. Been looking at switching alterna…
... been looking into finding some replacement for the 7805, since that ...Replacement 48K MembranesCan anyone recommend a website where I can buy a replacement membrane for my 48K? The only one I know of is Sintech but they charge extortionate amou…
Can anyone recommend a website where I can buy a replacement membrane for my 48K? The only one I know of is Sintech but they charge extortionate amounts for postage. One that takes Maestro debit cards would be ideal too.
Thanks. :)My Issue 2 spectrum"IT'S ALIVE!!!!!" - Dr Frankenstein I got my issue 2 spectrum up and running, colours and all. I borrowed socketed lower ram from my issue 3 that is…
... all. I borrowed socketed lower ram from my issue 3 that ... can not find its upper ram. It is quite possible that ... well as it did lower ram and cpu. They are GM7164p ... BVerstee, thank you again), and replacement 7805, electrolyte caps and a ...
