Interestingly, all 3 of the above are based on
variants of the venerable 6502.
Z80s were for pansies! :-)
HAHA, yo, 6502s are forever!
LDA #$37
STA $01
CLI
RTS
(:-)
Not to mention the undocumented operation "HCF" opcode 0x22. HCF was "Halt and Catch Fire": if you stuck one of those
into your program, the 6502 would hang. I still play games with 3-letter car number plates - when you see LDA, you
remember the variants (eg. immediate (A9 as above), absolute (AD), zero-page (indirect),Y, and zero-page (indirect,x)).
Not to mention Commodore Pet pokes (poke 59468,12 or 14 to turn all chars on the screen to upper or lower case), and
running interrupt-driven programs stored in the second cassette buffer RAM that would survive a reboot - our favourite
was to stick in an interrupt-driven program that would introduce a carriage return into the keyboard buffer at random
intervals, so you could never reliably conplete the command you were entering. Great fun, and endearing memories!
Regards... Sean.
BTW: Given the poor user interface provided by kit like the RML 380Z (a single input line at the bottom of the screen),
I agree about Z80-based systems.
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