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Spectrum dead: 8 vertical bars in alternating colorsI have been soldering on this basterd for a long time now. All IC's now have sockets (except the LM1889). I swapped all 4116's by types that are 100%…
... . Power is 100% ok. Swapped ULA, Z80 and ROM for 100% ok ... "desoldered" everything using a heat gun and now the PCB is ... -
Can somebody help me with this?One of my "friends" shoved a piece of metal into the back of my spectrum (48k RAM) and now whenever I try to use it theres nothing but weird lines an…
... ICs I'm afraid - the ULA is generally quite easy to ... is ok) - followed by the Z80 itself - these can go in ... you're lucky, the ULA & Z80 will be socketed, if not ... kill with thermal shock from the iron - if the ULA and Z80 are ... -
Some thoughts about emulationWhile discussing about 'real tape loaders' I just thinked about wat is total emulation (most complete, perfect). Some authors prefer for example loa…
... time than emulating a simple z80/ULA combination.
You have ... exercise?
Highly accurate ULA/z80 interaction is needed to reproduce ... more dotcrawl on the green gun than the blue.
Problem with my speccy 48+My machine boots up but apon booting it freezes and you can see feint grey horizontal 1 pixel lines going down the screen. Is this fixable at all?
... /> Yes. Sounds like a thermal fault, could be ULA, Z80, ROM, RAM (etc ... etc)
Assuming it's thermal ... will find about 95% of thermal faults IMO.Dead Spectrum SocietySo I'm getting back into real Sinclair computers rather than emulators. During the summer months I was lucky enough to buy a working ZX81 and was giv…
... .
Well... if the temperature test doesn't work, and ... that your Z80 is failing, or your ROM, or the ULA itself ... to boot, but then hangs. ULA, Z80 and ROM seemed to be ... that the attribute value the ULA is reading is not 00000010 ...48k packed up after cap changeHi all, I'm relatively new to the Sinclair world, my 8-bit repairs in past was lurking in the dark sides of Acorn, Amstrad and Commodore! I've got…
... i][/b]
"The ULA is mostly functional (it ... the video signal). The Z80 CPU is not processing ... ."
The Z80 is a new genuine Zilog ... the ROM and Z80 and the ULA & Z80 once I find ... and needs a high melting temperature, so I hope this ...Cro S2008Hi everybody!!! I hope this is right thread? :-) I want to share with you my new project. I call it ?S2008?? The idea was to build Spectrum48K clo…
... good staff already built in? ULA, Z80, LM1889 must stay in game ...R.I.P. spectrum 48kRecently one of my 48k rubber key (issue 4) machine bit the dust the other day when I tried to power it on. When powering it on, it gave a weird 'bee…
... Res?arch r$...
The ULA gets very hot.
ULA ferranti #7, all new electrolytic ... some custom fit heatsinks for ULA, Z80, etc...
I seem to ...Spectrum Serial Numbers Wanted!![b]This post updated Sept. 26, 2013[/b] As far as I know, the serial numbering system for the Spectrum has never been fully worked out. For the p…
... components such as modualtor, ULA, Z80, memory etc.
... codes for the ULA and Z80, plus Z80 manufacturer, then ... br /> As the ULA and Z80 can get replaced over ... : [xxxxxxxxxxxx] [ colour ]
ULA : [5C012E 5C112E 6C001E-6 6C001E ...Emulator_designHi guys, can anyone direct me to some links which explain how to write ZXSpectrum emulators. Thanks in advance.
... publicly available information about the ULA-Z80 interaction. There are certain individuals ...Is there any Sinclair world cup anthem?I've just been listening to a few World cup anthems past and present, but what I really need is a World Cup anthem that mentions any of the sinclair …
... /> Screen mem on the ULA
Z80 machine code, better than the ...48K Speccy not workingHey, A few months ago (hope it´s not to late) I was loading a game into my speccy and from one moment to another it stopped working! I unplugge…
... . The damage was devastating.
ULA, Z80, power supply transistors, lower RAM ...To Winston , diag-interface.Hello to all, first, sorry for my english i'm from spain and my english is very poor. Wiston, thank you very much for your great work "diag-interface…
The entire test leds sequence
[URL="http://www.youtube.com/watch?v=16PK2w1bfA8"]http://www.youtube.com/watch?v=16PK2w1bfA8[/URL]
I test the ULA,Z80 and the ROM in other ZX and works fine.Cro S2008Hi everybody!!! I hope this is right thread? :-) I want to share with you my new project. I call it ?S2008?? The idea was to build Spectrum48K clo…
... /> On board is original 48 ula + Z80 cpu + 32kB rom + ay-3 ...Cro S2008Hi everybody!!! I hope this is right thread? :-) I want to share with you my new project. I call it ?S2008?? The idea was to build Spectrum48K clo…
... good staff already built in? ULA, Z80, LM1889 must stay in game ...R.I.P. spectrum 48kRecently one of my 48k rubber key (issue 4) machine bit the dust the other day when I tried to power it on. When powering it on, it gave a weird 'bee…
... Res?arch r$...
The ULA gets very hot.
... (maybe 3) with new ULA ferranti #7, all new ... some custom fit heatsinks for ULA, Z80, etc...
I seem ... />
Ok, well the ULA gets very hot anyway - depends ... but it could be the ULA. Send it to somebody ...Spectrum Serial Numbers Wanted!![b]This post updated Sept. 26, 2013[/b] As far as I know, the serial numbering system for the Spectrum has never been fully worked out. For the p…
... various components such as modualtor, ULA, Z80, memory etc" what are you ...Spectrum Serial Numbers Wanted!![b]This post updated Sept. 26, 2013[/b] As far as I know, the serial numbering system for the Spectrum has never been fully worked out. For the p…
... various components such as modualtor, ULA, Z80, memory etc" what are you ...Spectrum Serial Numbers Wanted!![b]This post updated Sept. 26, 2013[/b] As far as I know, the serial numbering system for the Spectrum has never been fully worked out. For the p…
... various components such as modualtor, ULA, Z80, memory etc. These codes are ...An idea for a possible(?) new interfaceDue to the Spectrum's processor speed and the way the ULA works, there are a couple things (among others) that are difficult to do: -Gigascreen or a…
... the ULA superfluous and a faster cpu makes the internal z80 superfluous ... . And what is the spectrum if not the ULA+z80 ...An idea for a possible(?) new interfaceDue to the Spectrum's processor speed and the way the ULA works, there are a couple things (among others) that are difficult to do: -Gigascreen or a…
[QUOTE=Alcoholics Anonymous;394230] And what is the spectrum if not the ULA+z80 combination?[/QUOTE] The SAM?You know those modern atari games in a joystick...The modern way to play atari games, by buying a joystick that has games in-built? I have a stick with pacman, rally X and other namco classics. Well…
You know those modern atari games in a joystick...The modern way to play atari games, by buying a joystick that has games in-built? I have a stick with pacman, rally X and other namco classics. Well…
... speccy easily, errm putting the ULA / Z80 etc onto one chip.[/QUOTE ... effort including mapping out the ULA at the transistor level...? ;-)
Can someone identify thisSorry if it's something extremely obvious but this is the first time I've had my hands on a Spectrum in about 20 years (thanks eBay) and although som…
... issue 2 with older version ULA + a small factory mod to ... version of the 'transistor across Z80' that you see on some ... (under the tape, between ULA & Z80). Maybe issue 2 needed that ...Video generation using a CPUWe know it is possible to generate a video signal using a CPU, and this technique was often used on low-end computers in the early 1980's (for exampl…
... (A15 = high). The ULA detects this, reads the character ... In the Z80 refresh cycle that follows, the ULA puts this ... a very 'intimate dance' between ULA, Z80, ROM and RAM. :cool: ... Roughly halfway between "ULA = videochip" and "Z80 generates the screen".
Please explain Spectrum FPGA-clones to meI've been using the great ZXDS-emulator on the DS XL so far, which is great. But I kinda missed toying around with hardware. I've tried bidding on a …
... />
But......... wait a moment. ULA? Z80? Sinclair Basic? Nooo, Spectrum 16K ...Help with Spectrum 128k reparationHi! I have the following symptoms with a 128k unit version 6U - On power on, black and white bars (one char width each), white background - Once po…
... /> What else can be faulty? ULA? Z80? And how do I know?So for my first trick...I'm sure people have already used the AD724 or AD725 on other 8 bit machines, and i know the Harlequin uses the 724, but not seen anyone trying to us…
... 'll still have the original ULA, Z80 and AY, but the rest ...ZX Spectrum CartridgesI have been thinking of "cloning" ZX Cartridges for a while (case, board and silicon skirt), to be able to make new releases or replace damaged cartr…
... (Ram) + Border colour (stored in ULA) + z80 registers and Interrupt mode & ...
