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From: Tinkerer Atlarge on 11 Feb 2010 21:32
> MONITOR
> PC SR AC XR YR SP
> ; FB000 00 00 00 00 FA
> ZR
> PC AF BC DE HL IX SP
> Z; 01A26 0000 0000 0000 0000 0000 1BA0
> 0000 0000 0000 0000 0000 0000
> ZA 08000 3E 20 LD A,$20
> ZA 08002 11 00 04 LD DE,$0400
> ZA 08005 12 LD (DE),A
> ZA 08006 13 INC DE
> ZA 08007 21 EB 07 LD HL, $07EB
> ZA 0800A ED 52 SBC HL,DE
> ZA 0800C 20 F7 JR NZ,$8005
> ZA 0800E C9 RET
> ZA 0800F
>
> What an absolutely cool way to clear the screen!

Actually it won't clear the screen unless you type

ZJ 28000 ( 8000 won't work)

The CP/M BIOS chip lives at 0000-0FFF.

You can bank that chip out of the way by executing the above code in
Bank 2 which shares the same RAM at $8000 but not at $0400 when the Z80
is running.

(I'm not sure what would happen if you had more than 128K of RAM).
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