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Trying to repair a 128K (heatsink)I've bought another ZX Spectrum 128K (heatsink model), but unfortunately the last owner did not tell me it did not work.... Because this Speccy also…
[QUOTE=RetroTechie;404632]Maybe the oscillator works ... -
issue 2 sound /loading problemsHello im a newbie to the forum ..have owned spectrums for years..I have a issue 2 board in a dk tronics keyboard that i purchased off of ebay..works …
[QUOTE=RetroTechie;406583]My personal preference would ... -
Sinclair ZXC3 FLASH ROM CartridgeI recently received mail about the new ZXC3 PCB which provides the unique ability to program it directly from the Spectrum without the need for an EP…
[QUOTE=RetroTechie;408560] find suitable PCB production ... -
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…
[QUOTE=RetroTechie;423781]
... snip ...
Unfortunately ... -
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…
[QUOTE=RetroTechie;423781]Unfortunately a 32Kx8 SRAM ... -
Mass storage - why backup battery?I wasn't sure to post this under "hardware" or "development", but here goes: There are these mass storage devices for ZX Spectrum, and on many desig…
[QUOTE=RetroTechie;424416]....So: what the hell ... -
Mass storage - why backup battery?I wasn't sure to post this under "hardware" or "development", but here goes: There are these mass storage devices for ZX Spectrum, and on many desig…
[QUOTE=RetroTechie;424416]There are these mass ... -
Mass storage - why backup battery?I wasn't sure to post this under "hardware" or "development", but here goes: There are these mass storage devices for ZX Spectrum, and on many desig…
[QUOTE=RetroTechie;424569] In that case, there ... -
Mass storage - why backup battery?I wasn't sure to post this under "hardware" or "development", but here goes: There are these mass storage devices for ZX Spectrum, and on many desig…
[QUOTE=RetroTechie;424569]In that case, there ... call it hobbyistic...
[QUOTE=RetroTechie;424569]
But every build ... -
Mass storage - why backup battery?I wasn't sure to post this under "hardware" or "development", but here goes: There are these mass storage devices for ZX Spectrum, and on many desig…
[QUOTE=RetroTechie;424569]
Summarized: the SRAM + ... -
What means the suffix by 74LS IC's?What means the suffix by 74LS IC's? I mean: 74LS32N or 74LS74AN A, N, AN or sometimes nothing. Micky
[QUOTE=RetroTechie;428746]When in doubt: grab ... -
Spectrum 2-3 times more powerfull than MSX?![url]http://www.youtube.com/watch?v=2-kI0urN9tI#t=8m18s[/url]
[QUOTE=RetroTechie;429044]CPU: the same, even ... -
Spectrum 2-3 times more powerfull than MSX?![url]http://www.youtube.com/watch?v=2-kI0urN9tI#t=8m18s[/url]
[QUOTE=RetroTechie;429230]MSX inserts 1 waitstate ... -
Spectrum 2-3 times more powerfull than MSX?![url]http://www.youtube.com/watch?v=2-kI0urN9tI#t=8m18s[/url]
... extra delay.
[QUOTE=RetroTechie;429230]There are some timing ... -
Spectrum 2-3 times more powerfull than MSX?![url]http://www.youtube.com/watch?v=2-kI0urN9tI#t=8m18s[/url]
[QUOTE=RetroTechie;429230]On MSX, the video ... -
Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…
[QUOTE=RetroTechie;430214]
[*]Replace lower RAM ( ... -
Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…
[QUOTE=RetroTechie;431203]Thx. Miguel, very nice ... -
So which 8-bitter was biggest in which country?ewgf's topic "Be honest now..." got me thinking about this. As we got people from most European countries here and also a few abroad, tell us which 8…
[QUOTE=RetroTechie;433725]Here in the Netherlands, ... -
Mistake in the 128K technical FAQ?[url]http://www.worldofspectrum.org/faq/reference/128kreference.htm[/url] [quote]Memory banks 1,3,5 and 7 are contended.[/quote] Really? I thought i…
[QUOTE=RetroTechie;435578]You mean loading from ... -
What these?While I was scanning some material from Eric Deeson I came across a couple of pieces of hardware I haven't seen before. [url]ftp://ftp.worldofspectr…
[QUOTE=RetroTechie;436831]Perhaps the source, or ... -
My Spectrum has gone a bit dud since doing some Mods, HELPMy father in law and I did some modifications to my 48K rubber key Spectrum last weekend, and now it seems to be very keen to crash, especially when …
[QUOTE=RetroTechie;438944]Judging from your description ... ' section?[/QUOTE]
Thanks Retrotechie. I used a pencil eraser ... -
Remove +12 Volt itemsWhich items can be removed on a ZX48K issue 4b PCB if I don't need the +12 Volt? Micky
[QUOTE=RetroTechie;439535]...For more info, see ... -
Remove +12 Volt itemsWhich items can be removed on a ZX48K issue 4b PCB if I don't need the +12 Volt? Micky
... internal photos of your machine RetroTechie?, or anyone else who has ... -
CPU speed measure possible?Is it possible to measure the CPU speed and shows the result on a LED display? Micky
[QUOTE=RetroTechie;440838]Easier: hook up Speccy ... -
Joystick interface missing RD lineMy no name joystick interface has no RD line. It has the following ic's: SN74LS00N 74LS240N A How can I make a RD line? Micky
[QUOTE=RetroTechie;442475]Also: what's the ... -
Joystick interface missing RD lineMy no name joystick interface has no RD line. It has the following ic's: SN74LS00N 74LS240N A How can I make a RD line? Micky
[QUOTE=RetroTechie;442475]Also: what's the ...
