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Code Issues Releases Wiki Activity

Fixed the 'writing ROM' error

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This commit is contained in:
Ross Wilson
2015-10-12 14:58:35 +07:00
parent 4c9fa2535d
commit 867f5f91dc
4 changed files with 32 additions and 39 deletions
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49
pymlac/Memory.py
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@@ -90,15 +90,17 @@ class Memory(object):
memory = []
using_rom = True
boot_rom = None
rom_protected = False
def __init__(self, boot_rom=ROM_PTR, core=None):
def __init__(self, boot_rom=None, core=None):
""" """
self.corefile = core
self.boot_rom = boot_rom
self.memory = []
self.memory = [0]*MEMORY_SIZE
self.using_rom = boot_rom in [ROM_PTR, ROM_TTY]
self.rom_protected = self.using_rom
if self.corefile:
try:
@@ -116,9 +118,9 @@ class Memory(object):
If using ROM, that is unchanged.
"""
for i in range(MEMORY_SIZE):
self.memory.append(0)
self.set_ROM(self.boot_rom)
for address in range(MEMORY_SIZE):
if not self.rom_protected or not (self.ROM_START <= address <= self.ROM_END):
self.memory[address] = 0
def loadcore(self, filename=None):
"""Load core from a file. Read 16 bit values as big-endian."""
@@ -136,10 +138,6 @@ class Memory(object):
low = fd.read(1)
val = (ord(high) << 8) + ord(low)
# high = struct.unpack('B', high)[0]
# low = struct.unpack('B', fd.read(1))[0]
# val = (high << 8) + low
self.memory.append(val)
except struct.error:
raise RuntimeError('Core file %s is corrupt!' % filename)
@@ -155,21 +153,19 @@ class Memory(object):
high = val >> 8
low = val & 0xff
# data = struct.pack('B', high)
# fd.write(data)
# data = struct.pack('B', low)
# fd.write(data)
fd.write(chr(high))
fd.write(chr(low))
def set_PTR_ROM(self):
"""Set addresses 040 to 077 as PTR ROM."""
save_flag = self.rom_protected
self.rom_protected = False
i = self.ROM_START
for ptr_value in self.PTR_ROM_IMAGE:
self.memory[i] = ptr_value
i += 1
self.rom_protected = save_flag
def set_TTY_ROM(self):
"""Set addresses 040 to 077 as TTY ROM."""
@@ -182,24 +178,16 @@ class Memory(object):
def set_ROM(self, romtype=None):
"""Set ROM to either PTR or TTY, or disable ROM."""
save_flag = self.rom_protected
self.rom_protected = False
if romtype == 'ptr':
self.using_rom = True
i = self.ROM_START
for ptr_value in self.PTR_ROM_IMAGE:
self.memory[i] = ptr_value
i += 1
self.set_PTR_ROM()
self.rom_protected = True
elif romtype == 'tty':
self.using_rom = True
i = self.ROM_START
for ptr_value in self.TTY_ROM_IMAGE:
self.memory[i] = ptr_value
i += 1
self.set_TTY_ROM()
self.rom_protected = True
else:
self.using_rom = False
i = self.ROM_START
for _ in self.PTR_ROM_IMAGE:
self.memory[i] = 0
i += 1
self.rom_protected = save_flag
def fetch(self, address, indirect):
"""Get a value from a memory address.
@@ -261,7 +249,8 @@ class Memory(object):
if indirect:
address = self.memory[address] & ADDRMASK
if self.using_rom and self.ROM_START <= address <= self.ROM_END:
if self.rom_protected and self.ROM_START <= address <= self.ROM_END:
print('Attempt to write to ROM address %07o' % address)
Trace.comment('Attempt to write to ROM address %07o' % address)
return