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ZX PC InterfaceZX <-> PC Interface Contents 1) The ZX <-> PC Interface 1.1) What is it? 1.2) What does it do? 2) Installation 2.1) The softwa…
... | *P1 | 4 | +X | L | +X A15| L | +B
*SEL| L ... -
ahem!.. could I have a minute of everyones time please :)ok... here's the thing. I'm looking into sourcing some spare IC's for the whole range of Spectrums - mainly memory, as that's probably the weakest l…
... (with a nod to the ULA as well), 4116, 4532, 41464 ... -
Spectrum spares / repair jobsI recently bought a few faulty Spectrum 48+'s and have built a fully functional unit from the best bits of them, however this has left me with two pa…
... repaired or dismantled for replacement ULA / RAM chips to repair other ... -
Ecstasy & AgonyWhile checking out the area around Chennai Central station on Sunday, I came across this crowded narrow road taken up entirely by roadside vendors se…
... fried eh? Or perhaps the ULA? Somebody please tell me that ... were to replace the ROM/ULA and they would work I ... -
ANN: Spectaculator 6.2[NEW]: Spectaculator 6.2 Spectaculator is a Sinclair ZX Spectrum emulator for PCs running Windows 95, 98, ME, NT 4, 2000 and XP. Spectaculator emul…
Pentagon interface news from VELESOFTIt's from Xagon's board. It is about new interface for Speccy - it make Your comp compatible with Pentagon (and not only) and also it gives You up t…
Spectrum repairsHello, does anybody here have experience with repairing defunct Spectrums? I have several of them at home, mostly 48K ones collected over time from …
... symptoms of faulty memory or ULA ICs? Which ones are likely ...Broken keyboard?Maybe long time ago discovered (o; Just found that if the keyboard isn't working anymore but the key foil itself is intact you need to cut of the 5 …
... after long time usage internal ULA pull-ups take over (o ...InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... * How long does the 48K ULA hold /INT low?
* ... this is generated by the ULA every 69888 tstates, which ... When an interrupt occurs, the ULA pulls the /INT pin ... routine finishes before the ULA has pulled /INT high ... finished just as the ULA pulled /INT low, ...ScanlinesHere's an excerpt from the FAQ: [quote] Now for the timings of each line itself: define a screen line to start with 256 screen pixels, then border, …
... the CRT, so if the ULA is reading bytes it does ...Strange layout of Spectrum video memoryHello, does anyone have an idea why the Spectrum's video memory has such a strange layout? I understand that a resolution of 256x192 is an easy mean…
... the inner workings of the ULA can comment on this.
Replacement chipsAfter much digging around on here, it seems to be the general consensus that the ULA could be causing the problems im having (spectrum is deaf to the…
... the general consensus that the ULA could be causing the problems ... i could get a replacement ULA chip please? :)
Thanks ...Wanted: Code to wait until Border has been drawnWhen my IM2 interrupt fires, I want to wait until the ULA is past the first line of display before drawing. I know I need to wait about 14300T after…
When my IM2 interrupt fires, I want to wait until the ULA is past the first line of display before drawing.
I know I need to wait about 14300T after interrupt but how can I tell if the ULA is now past the border and onto the screen?Where to get Speccy bits and pieces...Hi everybody, My poor little 16K Speccy is begging to be fixed but I think the ULA has given up the ghost - when I power it on the screen stays the …
... fixed but I think the ULA has given up the ghost ... tick (which I believe the ULA is responsible for).
Anyhow ... I can find a 5C112 ULA as is in this machine ...KB1/2 QuestionHello all.. New to the forum and all that (posting at least), 'nuff said. At the the risk of making a fairly dull first post, I wondered if anyone …
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Now I know the ULA and membrane are fine but ...New member, dead SpeccyHallo everyone, I was directed here from a Commodore (boo, hiss) forum after pleas of aid with my newly acquired, quite dead 128k Speccy. I sincerely…
... , but if it's the ULA that's been blown to ...Slowly getting dead... (ZX48)Well, in a post of mine, I said that i have a problem with B,N,M,Symb.Shift and space. Then when i opened this wonder of technology, i saw that the t…
... or not. I mean dead ULA or dead membrane, no processor ...Spectrum IC1'sHi, I got 2 version 6a's both of which i think have dodgy Ferranti ULA 6C001E-7 IC1's. One's keyboard doesn't respond (have tried different keyboard…
... i think have dodgy Ferranti ULA 6C001E-7 IC1's. One ...Interrupt timingsHow long does the ULA hold /INT low for on interrupt on each of the Spectrum models?
How long does the ULA hold /INT low for on interrupt on each of the Spectrum models?How many T-states takes PUSH DE ?Hi. Just a quick one. According to z80.info docs, a PUSH DE should take 11 T-States to be executed. But WHAT if SP is pointing to Contended Memory,…
... change the fact that the ULA must access the video memory ...+2A ProblemHi ! I just got a +2A and it has a powerup problem. When I turn it on it just displays 1987 1987 over the first few lines and a random attributes p…
... the screen. It seems the ULA and Z80 are fine (picture ...Dead Speccies and IF1 ULAsLooking for dead Spectrums to repair (I'll even give them back working if you ask [I]really[/I] nicely - and you pay for 'em :) ). Also I have Interf…
... 1s that need a new ULA so if anybody has any ...nec780 vs z80aHi everyone! Got a 48k issue 2 board with nec780 with a mts2369 at its back.(spider?) Between pin 11 of the cpu and pin 14 of ic 23 theres a resis…
... half. (i have changed the ula for a known working one ...ZX-81 Ram Pack problemHi! I know this is a ZX Spectrum forum, but I am hoping someone here might be able to help me out... I have posted this to c.s.s. but noone was able…
... OK too. All traces to ULA and edge connector are OK ... than any others), only the ULA run hotter. But thats normal ...Z80 cycle contentionHi, Does anybody knows exactly when the ula halts the Z80 clock during a memory r/w cycle? I mean which Z80 clock cycle, T1 or T2? Thanks..
Hi,
Does anybody knows exactly when the ula halts the Z80 clock during a memory r/w cycle?
I mean which Z80 clock cycle, T1 or T2?
Thanks..When is a clone not a clone?If a Spectrum is built from scratch, using new components where available, is it a clone, copy or something else? See, I won an unpopulated Spectrum…
... PCF 1306P IC, LM1889 IC, ULA IC, the loudspeaker and the ...Faulty 128KI digged out my Spectrum 128, and it wakes not up. I don't have experience, only with 48K. Maybe someone can give me some hint, clue. It looks like m…
... /> It looks like memory (or ULA, CPU, memory control logic) error ... worth to replace RAM chips? ULA is warm (probably normal), but ...
