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If Sinclair computers had not been sold...I was just having a random thought. If Sinclair Computers (or the rights to them, not sure how it 'worked' back then) had not been sold to Amstrad…
... , the TS2068...
The ULA used for the later issue ... ZX Spectrum boards (ULA types with part numbers 6C001 ... of the pins on the ULA could have been freed up ... ...[/list]
[b][i]Mark[/i][/b] -
upper ram tacks / TR4 socket...[url="https://photos.app.goo.gl/MkqzRCuNCV3EPr9E7"]https://photos.app.goo.gl/MkqzRCuNCV3EPr9E7[/url] you can only replace that pesky TR4 so many t…
... "]here[/url].
The ULA does not care about the ... before fitting, make sure the ULA side of the data bus ... meter ;-)
[b][i]Mark[/i][/b] -
48k spectrum pausing the clockI had a spectrum 3b motherboard donated to me with no case. So i have decided to put it in a custom case with built in kempston port etc. I also …
... screen accesses made by the ULA are enough to keep the ... circuitry.
[b][i]Mark[/i][/b] -
Why is it so hard to produce ZX Spectrum add-on Hardware in the UK.Arguably the UK Spectrum add-on market is stagnating? Why ? Well obviously the ZX Spectrum is a very old retro micro so it's fan base would normall…
... IC would have been the ULA. I suppose the case, keyboard ... full time businesses have to mark up the pricing from cost ... -
Bit of fun - ToastRack , one change onlyAlthough there's an old "one change only" topic about, I was thinking about the toastyrack 128's earlier. Its actually the only Spectrum model I've n…
... never specified what the unimplemented ULA I/O port bits ... /Mic/Speaker part of the ULA).
I do ... would have freed up four ULA pins (one existing keyboard ... One of the (now) free ULA pins could then have been ... ...
[b][i]Mark[/i][/b] -
Bit of fun - ToastRack , one change onlyAlthough there's an old "one change only" topic about, I was thinking about the toastyrack 128's earlier. Its actually the only Spectrum model I've n…
Yeah, a lot of effort went into getting the maximum value from the ULA. And the first versions were fairly full.
[b][i]Mark[/i][/b] -
Bit of fun - ToastRack , one change onlyAlthough there's an old "one change only" topic about, I was thinking about the toastyrack 128's earlier. Its actually the only Spectrum model I've n…
... the maximum value from the ULA. And the first versions were ... full.
[b][i]Mark[/i][/b][/quote]
My ... -
Bit of fun - ToastRack , one change onlyAlthough there's an old "one change only" topic about, I was thinking about the toastyrack 128's earlier. Its actually the only Spectrum model I've n…
... memory, the timing of the ULA reading the screen data also ... considered. At the moment the ULA fetches two bytes every time ... bit/pixels line/byte, the ULA would have to fetch three ... byte.
[b][i]Mark[/i][/b] -
+2A vs +2BFrom what I understand, the +2A like the one I have is black, while the +2B is grey. Logically, the +2B came after the +2A, but why is there a prefer…
... gate array] instead of a ULA chip. Various other changes were ... up.
[b][i]Mark[/i][/b] -
Direct drive LCD screen - looking for information on previous projects people may have attempted.Hi All, My first post, so please forgive and guide if I've posted in the incorrect section. I'm a speccy user from way back in the 80's, but m…
... and border changes to the ULA) to maintain their own ... they synchronise with and sniff ULA reads from RAM (I ... the Z80 writes to the ULA register. BUT you MUST ... it can synchronise to the ULA’s picture generation. Otherwise a ... ).
[b][i]Mark[/i][/b] -
Repairs and Reparing.Hi All, Just finished resurrecting an Issue 3A board. Had black lines, so replaced the lower 16K RAM chips, Amazed they just cost a couple of doll…
... DRAM chips.
The ULA, Z80A, Mask ROM, and the ... ) can fail. These, like the ULA are long obsolete. But replacement ... [/url] ;-)
[b][i]Mark[/i][/b] -
128K refurb.... What is the best way?Here's the latest Spectrum I got... Finally got a Toastrack... Not sure if it was good value ( around US$100 ). [img]https://os.blackice.com.au/us…
... /> Loss of sync is a ULA issue which is not good ... ROM.
[b][i]Mark[/i][/b] -
128K refurb.... What is the best way?Here's the latest Spectrum I got... Finally got a Toastrack... Not sure if it was good value ( around US$100 ). [img]https://os.blackice.com.au/us…
... 6.
On the ULA, the clock input is on ... .8MHz output is on ULA pin 47.
ULA pin 39 is ... clock.
[b][i]Mark[/i][/b] -
Were the full Sinclair Loki specs ever actually known?I was just curious. A lot was leaked to the media, but the exact specs seem different depending on source. Some say it could support up to 512x256 an…
... modification was the first ULA design defect that was ... found. The next ULA version was modified to ... Yet another fault with the ULA design. Because the computers ... incorporated into the larger 128K ULA, extra chips were used ... br />
[b][i]Mark[/i][/b] -
Missed opportunities in the 80'sAll the talk of the Loki got me thinking... What if someone had built an expansion box for the speccy that had the 3812 Yamaha music chip ( Adlib Sou…
... problems when they altered the ULA (issue 2/issue 3 problems ... on?…
[b][i]Mark[/i][/b] -
Two new spectrums arrived. One no video.Got a +2 and a Toastrack arrived today. Toastrack was actually in good condition, little wear, though a little dirty. Worked well on first power up, …
... little heatsink compound under the ULA heatsink replaced... And now I ... /> Yep, you were right. Thanks Mark. That did it nicely. Checked ... -
More "What could have been"... The Z280.So in chasing up the Loki specs, I happened upon some parallel developments... And had Sinclair gotten to make the Loki, there could have been some i…
... = 0.125".
[b][i]Mark[/i][/b][/quote]
ULA. It might not be too ... -
5C Horizontal timing vs 6C horizontal timing.Hi all, Just considering the timing difference in the video signal between the 5C and the 6C where the 6C ULA seems to have 50% longer horizontal …
The 6C001E ULA versions are a lower power ... was improved in the 6C001E ULA versions. Due to the way ... video signal specification, the 6C001E ULA versions are better.
[b][i]Mark[/i][/b] -
48k ULA heat sink required ?ULA heat sink worthwhile mod or just internet hype ? if worthwhile is a cheap heat sink going to cut the mustard ? i wonder if anybody has done any …
... is not required on the ULA. How many old cars do ... heatsinks for [b]ANY[/b] ULA in any of their computers ... (yes, I know Amstrad did). ULA chips use a technology that ... extend the life of a ULA chip. I’m not convinced ... young.
[b][i]Mark[/i][/b] -
48k ULA heat sink required ?ULA heat sink worthwhile mod or just internet hype ? if worthwhile is a cheap heat sink going to cut the mustard ? i wonder if anybody has done any …
... for [b]ANY[/b] ULA in any of their computers ... improvements were made. If ULA chip failure was a big ... have fitted heatsinks to the ULA chips? I don’t ... is fitted to a Ferranti ULA?
(*) later versions ... … :))
[b][i]Mark[/i][/b] -
48k ULA heat sink required ?ULA heat sink worthwhile mod or just internet hype ? if worthwhile is a cheap heat sink going to cut the mustard ? i wonder if anybody has done any …
... bond a thermocouple to the ULA somehow (since the case temperature ... maximum running temperature and as Mark points out Ferranti never saw ... conclusively prove that their last ULA "DEATH" was due solely ... caused instant karma re the ULA on powerup ) which points ... -
48k ULA heat sink required ?ULA heat sink worthwhile mod or just internet hype ? if worthwhile is a cheap heat sink going to cut the mustard ? i wonder if anybody has done any …
... These are the later 7K ULA series. There is not much ... information about this ULA technology. But it’s ... that Amstrad used on the ULA in the +2 (grey) ... Do we know which Ferranti ULA technology/series are used for ... .
[b][i]Mark[/i][/b] -
48k ULA heat sink required ?ULA heat sink worthwhile mod or just internet hype ? if worthwhile is a cheap heat sink going to cut the mustard ? i wonder if anybody has done any …
... ]
Plus in some ULA designs the customer (Sinclair or ... Micro and next to the ULA in a ZX Spectrum.
ULA.
And of course ... voltage…
[b][i]Mark[/i][/b] -
16pf Capcitors for C72/C73 issue 3b. Can I use 18pf?Looking at the service manual it states to use a 16pf ceramic disc capacitor in positions C72 and C73 on issue 3b boards. Is this very critical in bo…
... of the chips like Z80 / ULA but there foot print will ... out though) and TR3 & TR6 can take MPS2369 .think i ... -
16pf Capcitors for C72/C73 issue 3b. Can I use 18pf?Looking at the service manual it states to use a 16pf ceramic disc capacitor in positions C72 and C73 on issue 3b boards. Is this very critical in bo…
... a plus with a Nebula ‘ULA’ in a standard stamped pin ... case.
[b][i]Mark[/i][/b] -
Were the full Sinclair Loki specs ever actually known?I was just curious. A lot was leaked to the media, but the exact specs seem different depending on source. Some say it could support up to 512x256 an…
... the 128k models because the ULA was changed to output digital ... (+ ‘bright’) signals. The 16k/48k/+ ULA did use digital RGB signals ... minimum.
[b][i]Mark[/i][/b] -
Were the full Sinclair Loki specs ever actually known?I was just curious. A lot was leaked to the media, but the exact specs seem different depending on source. Some say it could support up to 512x256 an…
... 3D games.
And Mark, if there's a video ... have been done in a ULA at very low cost. Also ... -
Were the full Sinclair Loki specs ever actually known?I was just curious. A lot was leaked to the media, but the exact specs seem different depending on source. Some say it could support up to 512x256 an…
... ULA technology that Sinclair had been using.
[b][i]Mark ...
