Not Atari, but definitely 8bit (ZX81)

Any 8bit repairs, images, cool things, upgrades etc.
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Re: Not Atari, but definitely 8bit (ZX81)

Post by Petari » Tue Aug 07, 2018 7:55 am

IngoQ wrote:
Tue Aug 07, 2018 7:02 am
While you're at it, check the 5V Regulator, these things were not very reliable. In my Speccy 128k I have replaced the 7805 with a L78S05CV, which allows more current and is cooler at the same time. My "toastrack" is now only a handwarmer ;)
I don't think that it is possible that some other voltage regulator is cooler with same load and same input voltage. Unless it works in switching mode. What is for sure not case with L78S05CV - what is "linear voltage regulator" - see data sheets. Actually, it would be hard to make switching one without coil, so hybrid technology - and much bigger price. There are some rules of physics what dictate how much heat will be produced.
There is 2 kind of people: one thinking about moving to Mars after here becomes too bad, the others thinking about how to keep this planet habitable.

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Re: Not Atari, but definitely 8bit (ZX81)

Post by stephen_usher » Tue Aug 07, 2018 8:12 am

PeteW wrote:
Mon Aug 06, 2018 9:05 pm
Looks like it's from late 1982 - the programming guide is a 1982 print and the software catalogue is the December 1982 edition. Is that a late model? I'll be honest I know little to nothing about the zx81 at this time!
Yes, that's just about the time Sinclair stopped selling them. The price drop shown on the box was probably to shift the last of the stock.
Intro retro computers since before they were retro...
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.

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Re: Not Atari, but definitely 8bit (ZX81)

Post by redhawk668 » Tue Aug 28, 2018 7:03 pm

Wow, my first computer. Got it when I was about 9. Although mine was a Timex Sinclair 1000 with a wobbly rampack :P.
My collection: 1040 STE, TOS 2.06, 4 mb, CosmosEx - 520 STFM, TOS 1.04, 4 mb, Blitter, CosmosEx - 520 STFM, TOS 1.04, 4 mb - 1040 STF, TOS 1.04, 1 mb, Gotek - Amiga 1200 with Blizzard 1220/4 - Amiga 500 + ACA500 - Amiga 500 + TF530, 1 mb chipram hack.

Atari 8 bit: 800XLF, stock - 600XL, Ultimate 1 mb, Sophia RGB - 130XE, 320 kb, Sophia RGB

Sinclair stuff: 3x Spectrum 48KB, Clones: Harlequin, JS128, Nuvo128 and Issue3B replica.

Ultimate64, a few C64 breadbins and Pi1541 for storage.

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