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

Posted: Tue Aug 07, 2018 7:55 am
by Petari
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 ;)
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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.

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

Posted: Tue Aug 07, 2018 8:12 am
by stephen_usher
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.

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

Posted: Tue Aug 28, 2018 7:03 pm
by redhawk668
Wow, my first computer. Got it when I was about 9. Although mine was a Timex Sinclair 1000 with a wobbly rampack :P.