Re: ZX81 audio.
Posted: Fri Feb 17, 2023 11:43 am
Seems by chance that also specdrum was using A5!
Discussion forums for users of the Sinclair 8-bit range of computers - ZX80, ZX81, ZX Spectrum, Z88, clones...
https://www.sinclairzxworld.com/
I honestly can’t remember what Zeddy Interfaces/expansions use A5. Just like the ZX Spectrum, all ‘simple’ I/O addresses are already used.