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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…
... to open, get the full ULA chip code and PCB issue.
ULA is reported in the list ... -
48 Issue 3b working but very hot ula and cpuSalve to everybody I bought from e*ay an Issue 3b 48k , fitted in a + case. Fixed the keyboard problem with a new keyboard membrane from good Rwap (w…
... the center part only of Ula chip is hot I think is ... it gets hot, but the chip surface not covered by it ... . A long heatsink, long as chip, maybe can dissipate more heat ... -
+3 issues....Hello All I came by a couple of +3's on ebay and I'm having issues with them. Since I only ever owned a rubber key, thought someone might be able to…
... of screen roll. This the ULA chip gone bad?
[/QUOTE]
unlikely to be the ULA. The ASIC on the +3 ... -
Memory upgrade for ZX Spectrum 16/48This is external memory upgrade for ZX Spectrum models with 16kB ram. Can be connect also to 48kB models, but need remove 8 dram chips (from sockets …
[QUOTE=roko;520117]Also downgraded to ULA 5C112E! This can't work, can it?[/QUOTE]
This is my old broken ZX boards. I only place ULA chip to issue 6a board. Yet is photos correct :) -
Is this the infamous Dead CockroachCan anyone help me. I have an issue two spectrum that I want to list on ebay, but I want to know if this has the dead cockroach ULA fix. I would have…
... in the original ULA design and this extra chip fixes it.
ULA chip it was necessary to fit ... -
Switching on my Spectrum+Trying one of my Spectrum+ results in not getting as far as the copyright message. The screen is all garbled displaying black boxes and lines and the…
I think that'll be the ULA chip that has gone. There are others on here that are much more up on this sort of thing than I am but I'm pretty sure that's what it is. -
New speccy modelThe 48k toastrack ;) [img]http://alistairtesting.no-ip.org/48k-toastrack.jpg[/img]
... problem is not a duff ULA chip. Bad Z80 is also easy ... -
New speccy modelThe 48k toastrack ;) [img]http://alistairtesting.no-ip.org/48k-toastrack.jpg[/img]
... problem is not a duff ULA chip. Bad Z80 is also easy ... .
As for ULA, I'm waiting for ULA Plus.
55 ... -
ZX Spectrum + alive thanks to this site.I was given a dead unit several months ago. I finally had time to look at it yesterday. Using the repair guide on this site the thing is now alive.…
... has had some modifications. The ULA chip is a 6C00IE-7 and ... -
ZX Spectrum + alive thanks to this site.I was given a dead unit several months ago. I finally had time to look at it yesterday. Using the repair guide on this site the thing is now alive.…
... has had some modifications. The ULA chip is a 6C00IE-7 and ... -
48k to 128k upgrade - problemsHi friends! I built 128k upgrade according to the [url]http://hw.speccy.cz/128krebuild.html[/url]. After I powered on my Speccy it said hello with s…
... . ZX Spectrum 48 contain different ULA chip than on ZX128. On your ... -
Gigascreen - programming guideDoes anyone know of a programming guide for the 128K gigascreen screen mode, specifically a persistence colours table, some code (pref. C level or BA…
... ZX clones/models with different ULA chip in quality not so good ... -
48k to 128k upgrade - problemsHi friends! I built 128k upgrade according to the [url]http://hw.speccy.cz/128krebuild.html[/url]. After I powered on my Speccy it said hello with s…
... like CPU overclock or even ULA replace for this one from ... ]
ZX48 use different ULA chip with different screen timing. Is ... -
Z80 - new MISTER BEEP albumAs a warmup for the upcoming 30th anniversary of our beloved machine, MISTER BEEP presents us his fourth album, named simply "Z80". [IMG]http://berl…
... by Spectrum's CPU - Z80 chip - that produces all sounds and ... (jack) through 1-bit transducer - ULA chip.
Sometimes it does it ... -
Speccybob PCB layoutSorry to start yet another Speccybob thread, but I can't seem to find out if anyone has tested Mike Wynne's PCB layouts. I have amassed all of the co…
... version. In my clone ALS245 chip performs well. [/quote]
Soviet ... clones (i mean these without ULA-chip) have even 74LS and it ... -
Colour blocks on displayHi all, I have just acquired another Sinclair product, my first one being a C5, it's a 48K ZX Spectrum. It shows colour blocks on the display when p…
You may want to keep ULA chip. Most valuable part of ZX.
It seems your faulty board does not have z80 fix ??? Issue 2 is a bit mystery to me, however. -
Colour blocks on displayHi all, I have just acquired another Sinclair product, my first one being a C5, it's a 48K ZX Spectrum. It shows colour blocks on the display when p…
[QUOTE=kpuchatek;603333]You may want to keep ULA chip. Most valuable part of ZX.
It seems your faulty board does not have z80 fix ??? Issue 2 is a bit mystery to me, however.[/QUOTE]
My faulty board has a NEC D780C-1, I believe. -
divIDE x Spectrum clonesAnyone has a Spectrum clone and did a test with divIDE? Here in Brazil we have 2 Spectrum clones (TK90X and TK95) that are almost 95-99% compatible w…
... via resistor with RESET to ULA chip. This is only very fast ... -
Outrun Europa in colourSwainy suggested that he'd like to try his luck with Outrun Europa colorful graphics and see if they can be improved. Let's give him the chance :) A…
I want ULA plus. I want it now. :)
Gimme a ULA chip I can just exchange in one of my Speccys (pull old one out 'n' plug new one in) for under ?50 and I'll be a happy bunny. -
Games not loading in my original spectrum 48kHello. I have recently bought a zx spectrum, for nostalgia purpose (haven't touched one for more than 20 years) The computer boots fine, but I can'…
... spectrum. The reason was the ULA chip,
and when I substitute ... -
telling the difference between speccysSorry for sounding like a dunce. ive seen a rubber keyed speccy in a local retro shop. How can i tell if its a 48k or 16k model without switching it …
... 16K machine from which the ULA chip already is removed. Or replaced ... -
Spectrum 48k clonesI saw this website today and numerous 48k Spectrum clones. [url]http://zxspectrum48.i-demo.pl/clones.html[/url] A couple of them are really beautifu…
... high 32kB of adress space. ULA chip is same as in ZX ... -
Spectrum 48k clonesI saw this website today and numerous 48k Spectrum clones. [url]http://zxspectrum48.i-demo.pl/clones.html[/url] A couple of them are really beautifu…
... , like a new Texas Instruments ULA chip, an EPROM containing the OS ... -
Faulty 48kHi all, Been a long time since my last vist to the site. I have an issue with a 48k I just picked up. When I type load "" and hit enter nothing hap…
... second non working 48k (faulty ULA chip I think) is it worth ... me swapping the ULA chips over and try to ... -
Faulty 48kHi all, Been a long time since my last vist to the site. I have an issue with a 48k I just picked up. When I type load "" and hit enter nothing hap…
Well I swapped the ULA chips over and it loaded up a game first time :) So thats one 48k working. Thanks all
PS does anyone have a spare ULA chip laying round ??
Thanks -
another faulty zx spectrum +2 to fix!!!Hello to all, I'm new here... I have got a faulty +2 (gray) and start to try fix it... I have read the treads of xaris_sm and Pluto63 as background…
... control logic (40058 / PCF1306 / ZX8401 ULA chip) of the +2 is equal ... -
16K/48K Lower RAM (4116) replacement.You may want to read [URL="http://www.worldofspectrum.org/forums/showthread.php?t=37957"]this thread[/URL] for background information on the quest t…
... adding a heatsink to the ULA chip than changing it for another ... -
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…
... are being created by the ULA.[/QUOTE]
I agree ... be to swap the ULA to another Spectrum, and ... swap a known good ULA into the misbehaving Issue 1 ... if the fault follows the ULA...
Just ... over time they tweaked the ULA chip slightly, so most are ... -
What models are repairable these days?I've followed a few threads which are trying to repair the mainboard components of the older 48K models, but it got me wondering - is it possible to …
... line lol - blown a few ULA chips on a +2a doing ... board that has the good ULA chip than to take it off ... -
Add horizontal hardware scroll to ULA+In this case we must read a bit in the ULA+ for test if supported. And the future software that uses it must have to branch: 1. If hardware scroll i…
... that if you plopped the ULA+ into a real Speccy?[/QUOTE ... Speccy, you must replace the ULA chip to do this. Note that ... the Spectrum original, not the ULA+ ones.
