12 Apr
2002
12 Apr
'02
3:08 a.m.
Derek Peschel wrote:
The OS/8 handbook for the PDP-8 discusses formatting
of data tapes.
Probably many others that I don't know about. There's also the subject
of reading (and booting from) punch cards but never mind that for now.
* a sample bootstrap for the 8080
* from a VDM-1 manual
* starts at 0 and loads 256 bytes of data and jumps to start when done
beg lxi h,start
sphl
mov c,h
call in
cpi 7fh
jnz beg
chrin dcr c
jz start
call in
mov m,a
inx h
jmp chrin
in in sport get char status
ani smask check status
jz in
in dport get char
ret
ds 2 stack space
start
* program goes here
--
Ben Franchuk - Dawn * 12/24 bit cpu *
www.jetnet.ab.ca/users/bfranchuk/index.html