folkert/python-pdp1170
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

BSD boot sequences expects csr in R1

Browse source
This commit is contained in:
Neil Webber 2025-04-06 08:13:39 -05:00
parent 9b0c1b906f
commit 2e6359f384
1 changed files with 8 additions and 6 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

14
boot.py
View file

@ -48,15 +48,17 @@ def boot_hp(p, /, *, addr=0o10000, deposit_only=False, switches=0):
# NOTE WELL: THIS ASSUMES THE MACHINE IS IN RESET CONDITION WHICH # NOTE WELL: THIS ASSUMES THE MACHINE IS IN RESET CONDITION WHICH
# MEANS MANY OF THE DEVICE REGISTERS ARE ASSUMED TO BE ZERO # MEANS MANY OF THE DEVICE REGISTERS ARE ASSUMED TO BE ZERO
# #
# MOV #176704,R0 -- note how used # The BSD boot program expects to find the CSR (176700) in R1. Note
# MOV #177000,-(R0) -- word count - read 1K though boot really 512 # how cute this little program is in obeying that :)
# MOV #071,-(R0) -- go! # MOV #176704,R1 -- note how used
# MOV #177000,-(R1) -- word count - read 1K though boot really 512
# MOV #071,-(R1) -- go!
program_insts = ( program_insts = (
0o012700, # MOV #0176704,R0 0o012701, # MOV #0176704,R1
0o176704, 0o176704,
0o012740, # MOV #177000,-(R0) 0o012741, # MOV #177000,-(R1)
0o177000, 0o177000,
0o012740, # MOV #071, -(R0) 0o012741, # MOV #071, -(R1)
0o000071, 0o000071,
0o0, # HALT 0o0, # HALT
) )