29 Aug
2012
29 Aug
'12
3:37 p.m.
Any more CP/M-compatible Z80 OSs?
ZCN on the Amstrad NC100 portable. Notable because the NC100 used the Z80
NMI, which you can't normally use on a CP/M system what with it being in
the middle of the default File Control Block at 5Ch. So ZCN has to go
through some elaborate gymnastics involving saving that byte of the FCB and
sticking a RST instruction there instead.
--
John Elliott