PICOZX81 - a ZX81 emulator for Raspberry Pi Pico

Author	Message
Frank N. Furter Guru Joined: 28/05/2012 Location: Germany Posts: 1056	Posted: 07:47am 19 Dec 2024       @Grogster: Thank you very much!!!   Volhout said   One thing I remember seeing was a way to safely control external devices with a ZX81. They glued (yes!) LDR's (light dependent resistors) to the monitor screen (blue-tak). And by lighting sections of the screen they controlled relays. I found that so ingenious I remebered. Nothing with edge connectors, and 74LS374 latches, address selectors, opto couplers...not...via the monitor itself. Volhout That's a very clever concept! I have an old TAN generator who works in a similar way... Frank