TS1000 Internal RAM: Part 1

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Australia The Clueless Engineer
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Published on ● Video Link: https://www.youtube.com/watch?v=ELaCecWBzso


Duration: 26:10
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Started work on a fresh TS1000. I designed a simple 32KB SRAM board that can be installed with no circuit board modifications required on either the ZX81 or TS1000 ... a so called "reversible" upgrade. Nothing spectacular ... there are other designs already available (see links below).

Unfortunately I couldn't complete the refurbishment work because I didn't have any 40-pin turned pin sockets for the ULA replacement - have been ordered.

So I won't know if my RAM board will work ... it *should* ... but let's see.

I replaced the existing RAM socket with a turned pin socket as well so that my board would sit nicely.

My RAM board:
https://github.com/0ddjob/ZX81/tree/main/RAM_Upgrade

Another design with surface mount SRAM:
https://github.com/redhawk668/ZX81-Internal-16K-Expansion

Switching regulators:
https://www.ezsbc.com/product/psu2-5/

vLA81 modern ULA replacement:
https://www.vretrodesign.com/products/vla81-zx81-ula-replacement



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