On a sunny day (Tue, 28 Oct 2008 12:42:02 +0000) it happened Adrian C wrote in :
No, that adaptor has been running many different things that needed 9 -to 12V DC Now it runs my SWR meter... It did run the home control system for years, an other smaller adapter does that now.
Also use it for experimenting any time I need a 12V or so.
Yes, that site, I actually had 2 ZX81 and 1 ZX80. Unlike the joke that guy made, I added 64k RAM, and a floppy controller, then an EPPROM programmer, then a 80 x 25 display, and wrote a CP/M clone on it, that actually did run a C compiler (Software toolworks C/80). Then I added an IBM keyboard :-), and finally replaced the old ZX81 with a processor card. You can find that OS, and a Z80 disassembler here:
ZX81 had a very good BASIC too, with nice syntax checking, would not let you enter a wrong line.