-
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 ...New from Paul Farrow, the ZXC4This is exciting stuff!!!! Sorry if ive stepped on your toes Paul, wanted people to hear about it!!! [QUOTE]Hi I?m happy to announce the release o…
... combination with the Interface 1 paging mechanism, thereby providing the potential ... compatible interface (such as the RAM Turbo), or with a ... passed to directly run the RAM Tester utility. The previous version ... a new version of the RAM Tester utility. For best ...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 ...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 ...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 ...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 ...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 ...80K RAM UpgradeAn 80K RAM upgrade has been listed on sellmyretro.com (not by me). It is based on the one originally designed by Sandy Electronics and has their p…
An 80K RAM upgrade has been listed on ... /details/NEW-SCT-MODULE-EXPANSION-RAM-80K-FOR--ZX-SPECTRUM-4119 ...Issue 1 16K RAM bankFolks, I recently had a chance to fix a couple of Issue 1 boards, and learned the hard way that the chips in the 16K RAM bank have a different place…
... the chips in the 16K RAM bank have a different placement ... from 2 up have the ram chips lined up the most ... meaningless reports from the Fruitcake RAM tester, I finally checked all ...128K RAM tester as .TAP?I was sure that I've seen a RAM tester that can be loaded with e.g. DivIDE or DivMMC EnJOY! as .TAP. But I can't find it (been searching through the …
... that I've seen a RAM tester that can be loaded ... 128K machines, and if lower RAM works fine, and there is ... a small error in upper RAM.
I have a ...New version emulator ZEsarUX-2.0Hi I have uploaded a new version of my ZX80/81/Spectrum/Z88 emulator on [url]http://sourceforge.net/projects/zesarux/[/url] Changes are: Added Ca…
...
Added option to emulate RAM refresh
Added option to ... on +2A machines and memory paging enabled
Fixed timing with ...Wanted: RAM Turbo InterfaceHi guys I am on the lookout for a RAM Turbo interface so anyone has any going spare then please give me a heads up. Cheers
Hi guys
I am on the lookout for a RAM Turbo interface so anyone has any going spare then please give me a heads up.
CheersSpectrum +2 (grey) RAM issueHi, I?ve got a ZX Spectrum +2 (grey) with what I think is a RAM issue. I used to be able to load games very reliably by playing converted TAPs and …
... what I think is a RAM issue.
I used ... that device is a 128K RAM test firmware.
When ... [/url], page 4) means that RAM page 5 has an issue ... the PCB is for which RAM page?
I?m ...Loads of Microdrive cartridges on Ebay plus Vortex RAMI?ll be selling three bundles of eight Microdrive cases with four, used cartridges each, means 32 cartridges per bundle, here?s one of them [img]http…
... an untested Vortex SP 512 RAM expansion with CPU and ULA ...Another silly hardware idea - RAM Pack adaptorHow about a mini bit of PCB that adapts ZX81 RAM Packs to replace the address space of the Spectrum's ROM? I guess practically you'd need a way to…
... of PCB that adapts ZX81 RAM Packs to replace the address ... well just design your own RAM board.
Could have ...Turbo RAM Glitch or feature ?I have been testing a Spectrum [url="http://www.worldofspectrum.org/infoseekid.cgi?id=1000328"]worldofspectrum.org/infoseekid.cgi?id=1000328"]RAM Tur…
The history of ESXDOS, the DivMMC and the DivMMC EnJOY![img]http://benophetinternet.nl/hobby/divmmc_history/1%20esxdos.jpg[/img] These are the stories behind esxDOS, the most popular operating system e…
... /> --------------------------
ROM and RAM in More Detail
--------------------------
- DOS in ram: more commands/funtionality can be ... .
The memory paging port is compatible with ... , but there are more ram pages available.
< ...Interface 1 ShadowROM pagingI read the Interface Shadow ROM Disassembly book. I wondered how that rom calls the interface's rom paging mechanism. It doesn't! I learned there is …
... calls the interface's rom paging mechanism. It doesn't! I ... man! It's so weird paging mechanism that it is almost ...
