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Help reviving a 128 +2 GreyHello m8s, my turn to ask for some help with a +2 Grey. Got it for spares as I do have a working one but I could not resist to try and fix it. As us…
... test program runs, then the Z80 CPU is okay.
If you ... much depend on what the Z80 CPU is doing. For example if ... the Z80 is struck in a loop ... -
+2 Grey NMI problemMy shonky old +2 has always worked very well until recently, ive found that hitting the nmi button on my multiface will either do one of three things…
... the M1 line on the Z80?[/QUOTE]
Yes and ... />
If your suspect Z80 CPU is socketed, and you can ... could construct a very simple Z80 CPU test circuit. Then you ... can run the Z80 CPU slowly so that a simple ... just to buy a new Z80 CPU :p and then try ... -
Interface 1 bisOk, well the postmans just been and brought with him my new arrival, the Interface 1 bis. So as promised I thought I'd share some initial usage exper…
... -based filesystem, optimized for the Z80 CPU ? -
Interface 1 bisOk, well the postmans just been and brought with him my new arrival, the Interface 1 bis. So as promised I thought I'd share some initial usage exper…
... -based filesystem, optimized for the Z80 CPU ?[/QUOTE]
So he ... -
Issue 3 board... How to resurrect?Dear Everyone, Now I have a working 48k Issue 3, a sort of working Speccy+ (still having problems with the keyboard, more of that in another post) a…
... I have heard of a Z80 failure. I know some members ... have never experienced a faulty Z80 CPU in the ZX Spectrum. I ... -
Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…
Well, I would normally have suggested that another Z80 CPU be tried, but on a issue 1 board every chip except the ROM is soldered :-(
[B][I]Mark[/I][/B] -
How to test Z80 Code?Hi All, Is there a way to test a block of z80 code (nothing speccy specific in it) with many different inputs? The reason I ask is that I'm writing…
... .google.com/p/z80-cpu/"]http://code.google.com/p/z80-cpu/[/URL] writing ... -
ZXDev - powerful environment for development in four languages is ready for testingXDev/ZXDev is open and free set of compilers, additional tools, libraries and design patterns for target platform ZX Spectrum 48K in different progra…
... 6502[/url] (there is a CPU that has been used in ... solid technology for development for Z80 CPU under Linux is, undoubtedly, the ... -
Issue 4A issuesHi all, I've been trying to get the Issue 4A board that came DOA with the case I purchased for my Frankenspectrum to work. I've recapped and socket…
... of the first things the Z80 CPU does is to set the ... black screen.
If the CPU finds some RAM is good ... remember, the ROM starts the CPU testing the RAM from the ... -
Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…
... help to either clear the Z80, RAM and the address, data ... (A0 to A15) at the Z80 CPU.
See also this ... -
Fastest Z80?Hi , Could somebody explain more about the Kawasaki Z80 33 MHz to me? Is it fully backwards binary compatible with older Z80s and could it be used a…
... LSB are documented on the Z80.[/QUOTE]
Yes [I ... ="http://en.wikipedia.org/wiki/Z80#.27Undocumented.27_16_bit_I.2FO-addressing"]See ... 't forget, many of the Z80 CPU features are designed to be ... these core functions and the Z80 is the result.
< ... -
The "best" Z80?What's the best Z80 for Spectrums? I know there are differences between brands (Nec, Zilog, Thomson) and technologies (CMOS, NMOS), so what Z80 woul…
... that they all used NMOS Z80 CPU chips. The 48k, 48k + and ... -
The "best" Z80?What's the best Z80 for Spectrums? I know there are differences between brands (Nec, Zilog, Thomson) and technologies (CMOS, NMOS), so what Z80 woul…
[QUOTE=1024MAK;716360]I think that they all used NMOS Z80 CPU chips. The 48k, 48k + and 128k did. And my grey +2 does.[/QUOTE]
Great, thank you Mark. This means that at least I have a Plan B :)
Aleksey -
The "best" Z80?What's the best Z80 for Spectrums? I know there are differences between brands (Nec, Zilog, Thomson) and technologies (CMOS, NMOS), so what Z80 woul…
... ://www.cpu-world.com/CPUs/Z80/Zilog-Z0840004PSC.html"]Z0840004PSC[/URL] CPU's ... a number of different manufacturers Z80 CPU's, all of which are ... -
The "best" Z80?What's the best Z80 for Spectrums? I know there are differences between brands (Nec, Zilog, Thomson) and technologies (CMOS, NMOS), so what Z80 woul…
... think, have to check) Mostek Z80 CPU's somewhere (and no they ... -
Strange error screen on a friend's 128k +2Hi all, Can anyone help me with this screen? [url]http://imageshack.us/photo/my-images/856/sw1k.jpg/[/url] (it is his own link) My friend wants to…
Most likely cause is a defective DRAM chip.
There are other things that may cause it, including Z80 CPU, ROM chip, and anything that messes up the address, control or data buses.
[I][B]Mark[/B][/I] -
Corrupt paper on zx spectrum 48kHi. When I power up my spectrum (issue 3) I get the light grey border, but the paper is black and it switches between thin red vertical lines and thi…
... to know what instructions the Z80 CPU is processing. This is hard ... the system is faulty, the Z80 may be processing random instructions ... -
Keystone KapersHi all a classic game and favourite of mine is keystone kapers on the Atari 2600. it is a game that surely could be easily implimented on the specc…
The ColecoVision has a Z80 CPU and has some great Activision ... the Sega Master System (also Z80) has one of the best ... -
Barn find #4I think this is some sort of backup device. Its got "007" on the motherboard and the mice have chewed the buttons. Will do a little research later in…
... can take control of the Z80 CPU via a NMI routine.
Z80 CPU.
Now if BASIC is ... have no effect on the CPU while our machine code program ... be accessed). So if the Z80 CPU tries to read from memory ... -
ZX Spectrum clock signals comparedI haven't searched for this on WoS; it might have been posted before. But I think it's important info, and can't do any harm to repeat or show from a…
... of the transistor.
NMOS Z80 CPU's like a sharp clock ... -
ZX Spectrum clock signals comparedI haven't searched for this on WoS; it might have been posted before. But I think it's important info, and can't do any harm to repeat or show from a…
... of the transistor.
NMOS Z80 CPU's like a sharp clock ... -
Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…
... write data bytes that the Z80 CPU writes to video RAM. From ... -
Defective +2 grey with only random coloured screen while powering onHi, so the story goes: After buying myself an divIDE and a grey +2, this runs well for a few days. But while playing a game the picture stucks and …
... /> Looks to me like the CPU isn't doing very much ... generated?
If the Z80 is socketed I'd start ... suggestion. I?ve exchanged the Z80 CPU and this changes nothing.
zx spectrum without TR6 (ZTX313)Hi is it possible that a zx spectrum 48 issue 2 works without TR6 (ZTX313)? Should be very interesting.
... address line A0 from the Z80 CPU!
Note that there ...Best Demos please?Hi, I have just discovered how good the demos for the spectrum are, I have been a spectrum owner for years but apart from the work I used to look at …
V6Z80P is best ZX clone available now with real Z80 CPU on board and cycle perfect ZX and Pentagon cores.Anyone identify this hardware?[url=http://postimage.org/image/8u4yputfv/][img]http://s9.postimage.org/8u4yputfv/P041112_13_21.jpg[/img][/url] [url=http://postimage.org/image/4z661…
... s not a Z80 - it's a Z80 PIO, basically ... several chips called Z80 - something: the Z80 CPU which we all ... have in the Speccy, the Z80 ... IC), and the Z80 DMA. The Z80 peripheral chips (PIO, ... />
Basically the Z80 PIO is being used to ...Toasted +3Oops.. I shorted one of my +3 (being clumsy with multimeter, doh) when measuring PSU connector pins :D Any immediate guesses what exactly died on thi…
... possible that the reset line (cpu?) become stuck in some way ... screen.
Possibly the Z80 CPU? I noticed pin 26 on ... the z80 (reset) goes to IC15 pin ... happened to be a fried cpu, what would be some of ...Toasted +3Oops.. I shorted one of my +3 (being clumsy with multimeter, doh) when measuring PSU connector pins :D Any immediate guesses what exactly died on thi…
... possible that the reset line (cpu?) become stuck in some ... .
Possibly the Z80 CPU? I noticed pin 26 on ... the z80 (reset) goes to IC15 ... happened to be a fried cpu, what would be some ... that a bad or missing z80 left random blocks on ...Toasted +3Oops.. I shorted one of my +3 (being clumsy with multimeter, doh) when measuring PSU connector pins :D Any immediate guesses what exactly died on thi…
... do-able.
The Z80 CPU is probably on a socket ...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…
... bit 256 cycle refresh (the Z80 CPU only does a 7 bit ...
