16k Sinclair issue 1 pack

Discussions about Sinclair ZX80 and ZX81 Hardware
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msknight
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Location: Sussex, UK

Re: 16k Sinclair issue 1 pack

Post by msknight »

Unless someone says different, I'm going to go for ....
BAT85 30V 200mA Small Signal Schottky Diode
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1024MAK
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Re: 16k Sinclair issue 1 pack

Post by 1024MAK »

msknight wrote: ↑Mon Feb 26, 2024 11:07 am Unless someone says different, I'm going to go for ....
BAT85 30V 200mA Small Signal Schottky Diode
They should be fine ;-)

Mark
ZX81 Variations
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Looking forward to summer later in the year.
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msknight
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Re: 16k Sinclair issue 1 pack

Post by msknight »

Firstly ... I'm still waiting for the Schottky diodes to arrive but... here's the question...

When I used the silicone diodes I was showing a signal well below the 1v demonstrated in the diagrams - https://www.sinclairzxworld.com/viewtop ... 497#p54497 - so why wasn't this good enough to work?
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msknight
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Location: Sussex, UK

Re: 16k Sinclair issue 1 pack

Post by msknight »

The shottky diodes arrived, and it works. I documented it here... if anyone notices anything I've got wrong, please shout.

https://msknight.com/bbc/zx81-rampack.html

Once the vintage RAM issue is sorted, then I think I'm done.
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