ZX81 audio.
Re: ZX81 audio.
Seems by chance that also specdrum was using A5!
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Re: ZX81 audio.
I honestly can’t remember what Zeddy Interfaces/expansions use A5. Just like the ZX Spectrum, all ‘simple’ I/O addresses are already used.
A5 is used by the Kempston joystick interface (designed for the ZX Spectrum, but the early versions fitted with ZX81 size edge-connectors) do work on a ZX81.
Somewhere in the hardware section, I did post the I/O addresses of all interfaces and expansions known to me at that time. But that was some years ago. I will link to it when I find it.
Mark
ZX81 Variations
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp
Standby alert
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Looking forward to summer later in the year.
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer later in the year.