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uppersize and systemID

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This commit is contained in:
Neil Webber 2024-05-18 13:38:49 -05:00
parent 5a95c06401
commit 96ae70668e
1 changed files with 3 additions and 1 deletions
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4
machine.py
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@ -129,6 +129,7 @@ class PDP11:
# System ID register
SYSTEMID_OFFS = 0o17764
SYSTEMID_DFLT = 0x666 # this is arbitrary? simh: 0x1234
# the CPU error register and some useful bit values
CPUERROR_OFFS = 0o17766
@ -243,7 +244,7 @@ class PDP11:
('swleds', self.SWLEDS_OFFS),
('breakreg', self.MICROPROG_BREAK_REG),
('lowersize', self.LOWERSIZE_OFFS),
('uppersize', self.UPPERSIZE_OFFS),
(None, self.UPPERSIZE_OFFS), # dummy always 0
('systemID', self.SYSTEMID_OFFS),
('error_register', self.CPUERROR_OFFS),
('logging_hack', self.LOGGING_OFFS)):
@ -253,6 +254,7 @@ class PDP11:
self.swleds = 0
self.error_register = 0 # CPU Error register per handbook
self.breakreg = 0 # microprogram break register (diags)
self.systemID = self.SYSTEMID_DFLT
# NOTE: The cold machine starts out in stack limit violation.
# (stack pointer = 0). However, the limit semantics only apply