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Repalce 4164 RAM by 41464Dear all, I have some amount of 41464 DRAM from old PC VGA card which are useless at the moment. I think to keep them as a spare for the upper 32k R…
Interesting 48K failureI thought I'd recount a failure I've not seen mentioned before that I saw tonight while fixing a 48K issue 6 board. The background: The initial fail…
... was just loading this supply voltage too much. Putting in sockets ... /> 1. A fault in upper RAM causing incorrect instructions to get ... with R27 could mean the voltage at the junction of of ...DIY Issue 1 Internal 32K RAM expansionFollowing on from the information in [URL="http://www.worldofspectrum.org/forums/showthread.php?t=40173"]this[/URL] thread, I finally figured this ou…
... of the Issue 1 internal RAM module.
The pinouts ... when the top 32K of RAM is addressed. Here's a ... the machine saw 48K of RAM, verified with PRINT PEEK 23733 ... machine is seeing 48K of RAM now and that there were ...Buying ram for W7It's been a long time since I bought any ram for a PC (I think I bought a few DIMMs when they first appeared) so I thought I'd ask here to make sure …
... time since I bought any ram for a PC (I think ... /components/memory-pc/ddr2pc2-6400800mhz/ram-804gk.html"]these DDR2 DIMMs ...From RAM to dim v$() "video buffer" SPEED UP!Hi! This question is related to "quick RAM copy using LET in Basic" ([url]http://www.worldofspectrum.org/forums/showthread.php?t=44296[/url]). Wel…
... question is related to "quick RAM copy using LET in Basic ... buffer".
- A zone of RAM with 160 bytes corresponding to ... that stores the v$ dim RAM position.
When ... readed from RAMPEEK v$ dir RAM...
[INDENT]POKE dir,byte ...Referbished and modded ZX81When I had this ZX81 it wasn?t working very well. It would refuse to tune into my old CRT TV so I decided to get it up and running on modern TV's. I…
... pictures comes with a 16k ram pack so you can get ... power I have a multi voltage power supply as the original ...ZX81 internal RAM upgrade?It's only a matter of time before I kill my ZX81 due to this slack ram pack :( Is there a tutorial available that will allow me to upgrade my RAM to…
It's only a matter of time before I kill my ZX81 due to this slack ram pack :(
Is there a tutorial available that will allow me to upgrade my RAM to 32k or maybe even more?HDMI generation by cloning video ram(coming from [url]http://www.worldofspectrum.org/forums/showthread.php?p=768257&posted=1#post768257[/url]). A thing I was brainstorming about.. Why …
... /microcontroller respond to any video ram change in the ZX Spectrum ... /> No analog circuits, no video ram reading and contention problems.
ram, with HDMI output...
Simple Question! RAM InterfaceI was messing around on my spectrum yesterday and blew it up! Im sure it has to do with the RAM joystick interface I bought but hadn't tested. Is the…
... has to do with the RAM joystick interface I bought but ...Hooky - hook ZX ROM and rewire RST and NMI to RAM - rantThis is a rather long rant. Not for short tempered. :) The objective is to hook into RST "vectors" and NMI on a Spectrum without affecting the normal…
... But since this is in RAM we can later redirect ... best "safest" address in RAM for such a table?< ... (incl. Speccy) do a RAM test
at startup. ... table before
the RAM test / it will get overwriten ... Bummer. What if we replace RAM checking
code with ...Seriously weird Issue 2 issue... (RAM-related)Hi guys; I have been trying to fix up my Issue 2 and have run across a bizarre issue that I haven't seen elsewhere in the forums. Hopefully one of …
... /> 2. MEMCHK returned 32767, upper RAM fault. UPRAM85 returned 93, so ... "black screen and red bars" RAM test appears, after which the ...ZX81 + 16k RAM Pack + Original PSU... What's it worth?Hey guys Got my ZX81 this morning its in excellent condition.. [IMG]http://s30.postimg.org/iwetzxku9/IMG_20140818_142443.jpg[/IMG] However, my T…
... with original PSU & 16k RAM pack actually worth here? If ...For Sale?? Offers? Spectrum ZX81, PSU & 16k RAMHi all I've got a ZX81, 16k RAM pack & original PSU here I purchased sadly it won't work with my TV and I don't want to hack it apart to make compos…
... 've got a ZX81, 16k RAM pack & original PSU here ...RAM issue for potential 48k buy?Hi guys I've got a 48k in my sight for ?20 but... it has an issue: [QUOTE]"I tested the computer and only displayed a distorted screen. Coloured …
... />
Would this be faulty RAM chips? I've seen similar ...Wanted: ZX81 boxed with 16k RAM PackI'm looking for a clean, working and good condition ZX81 with original Sinclair 16K RAM Pack. Would prefer if it was in a box. Oh and if you have 3D …
I'm looking for a clean, working and good condition ZX81 with original Sinclair 16K RAM Pack. Would prefer if it was in a box. Oh and if you have 3D Monster Maze that would be the icing on the cake, thanks.Is my ZX81 RAM Pack OK?Hi guys I've just taken my 16k RAM pack apart to give it a clean inside and out and i noticed these strange burn type marks!? [IMG]http://s7.postim…
... 've just taken my 16k RAM pack apart to give it ... this burn marks!? Is my RAM pack damaged I haven't ...48K Ram Check Command not workingI am trying to repair my Spectrum 48k. It is having issues loading games, sometimes they load all the way to launch and then the speccy resets. Oth…
... points me towards checking the RAM.
I have entered ...Spectrum stuff for sale (ZX81, RAM pack, Tapes... etc)Selling the following: [IMG]http://s26.postimg.org/uk0ntdsq1/IMG_20140902_205737.jpg[/IMG] [IMG]http://s26.postimg.org/ronkmioq1/IMG_20140902_20575…
... original too)
ZX81 16k RAM pack - Working
Spectrum tapes ...Early ZX80/81 RAM Pack???Hey all I got given this RAM pack... It doesn't work (i know why now) but compared to my RAM pack this one is really strange... Is this a ZX80 RAM p…
... />
I got given this RAM pack... It doesn't work ... now) but compared to my RAM pack this one is really ... strange... Is this a ZX80 RAM pack or something as it ...Upper Memory LinksI've got an 1982 Issue Two Spectrum 48k with an upper RAM fault. I've narrowed down the faulty IC and I'm in the process of removing the 8 IC's, sock…
... Spectrum 48k with an upper RAM fault. I've narrowed down ... to change any links for voltage or chip type though before ... replacement -3 suffix chips. The voltage link adjacent to IC1 is ...Pictures of 48k ZX Spectrums Showing the Important Voltages[SIZE=6][B]Pictures of 48k ZX Spectrums Showing the Important Voltages[/B][/SIZE] [URL="https://farm4.staticflickr.com/3841/15005543009_7bcf3b3031_o…
... sink for all of these voltage tests.
[LIST]
RAM chips, bottom left of the ...ZX81 internal RAM board?Just a quick question to Zorn (amongst others). What would the issues be with fitting one of Zorn's RAM boards into an unexpanded ZX81? Seems to me…
... fitting one of Zorn's RAM boards into an unexpanded ZX81 ... a lot of the official RAM pack's internal circuitry is ... one - preferably the 32K upper RAM board, 'cos I never had ...Help with 128k greyHello friends, need some help here on try fixing a +2 grey spectrum128. To keep it short, opened the case and the voltage regulator was missing, the …
... opened the case and the voltage regulator was missing, the ... I desoldered all the ram chips and after testing ... where faulty. Replaced the ram chips and powered up ... eprom fitted and... "lower" ram test passed. Then an ... it is not the ram chip. Checked the socket ...The complete Manic Miner RAM disassemblyHot on the heels of the [url="http://skoolkit.ca/disassemblies/jet_set_willy/"]Jet Set Willy disassembly[/url], here is [url="http://skoolkit.ca/disa…
... /manic_miner/"]The complete Manic Miner RAM disassembly[/url] (Bug-Byte version ...Interface 1bis RAM Drive modificationAll Interface 1bis users I hope I am not interfering with Dan, but I saw on his site that he has a RAM Drive upgrade/modification for the Interface …
... site that he has a RAM Drive upgrade/modification for the ... have an on-board 128K RAM drive, the user must install ...ZX Spectrum +2 (grey case) voltage converter circuit oddity.I'm working on repairing one of these and have encountered a possible problem and I'm not sure what I can best do about it, if anything needs to be d…
... circuit board that houses the voltage converter circuit (top right) had ... /> Measuring the outputs of the voltage converter circuits in both Spectrums ... have a diagram of the voltage converter circuit to hand while ...No text at startupGreetings from Norway all Spectrum enthusiasts. I hope someone can help me with this. When I power up my Spectrum 48k (issue 3b) I get a white border…
... . I have replaced all upper RAM chips and replaced capacitors without ... . The lower RAMs have correct voltage readings.Issue 2 Upper Ram, Loading & ResettingI have a 48k Issue 2 Speccy and for the life of me can't track down what the problem is with it. I initially thought that some of the uppe ram ic's w…
... that some of the uppe ram ic's were faulty ... on to desoldered the upper ram ic's, socketed the ... board and replaced the ram with known good chips. ... replaced all the upper ram with known good ram from another Issue ... cant now be the upper ram as I swapped and ...I broke my 48k Speccy!!!!Hey guys, I am looking for some advice, I hope you can point me in the right direction. So, I went about replacing all the capacitors on my issue 4…
... /> The voltages on the lower ram are well out of whack ...
I checked the voltage regulator, TR4 and TR5 and ... left hand leg on the voltage regulator using the 200k meter ... have issues with my lower ram now due to the weird ...Ram Turbo Interface with Kempston and Sinclair/Amstrad joysticksHi! Do you know how to plug and use two different joysticks with the Ram Turbo interface? [url]http://www.worldofspectrum.org/infoseekid.cgi?id=1000…
... two different joysticks with the Ram Turbo interface?
[url ...
