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Code Issues Releases Wiki Activity

New code to test PTR and PTP devices

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This commit is contained in:
Ross Wilson
2015-06-13 19:10:11 +07:00
parent 28853259bd
commit 38dfba80f0
3 changed files with 208 additions and 29 deletions
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55
pymlac/DisplayCPU.py
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@@ -26,15 +26,16 @@ DIB = 0 # display CPU ???
DX = 0 # display CPU draw X register
DY = 0 # display CPU draw Y register
# state variables
mode = MODE_NORMAL
running = False
# global state variables
Mode = MODE_NORMAL
Running = False
def init():
mode = MODE_NORMAL
running = False
global Mode, Running
Mode = MODE_NORMAL
Running = False
def DEIMdecode(byte):
"""Decode a DEIM byte"""
@@ -57,6 +58,7 @@ def DEIMdecode(byte):
def doDEIMByte(byte):
global DPC, DX, DY, DRSindex
global Mode
if byte & 0x80: # increment?
prevDX = DX
@@ -73,7 +75,7 @@ def doDEIMByte(byte):
# display.draw(0, prevDX, prevDY, DX, DY)
else: # micro instructions
if byte & 0x40:
mode = MODE_NORMAL
Mode = MODE_NORMAL
if byte & 0x20: # DRJM
if DRSindex <= 0:
Trace.comment('\nDRS stack underflow at display address %6.6o'
@@ -92,18 +94,19 @@ def doDEIMByte(byte):
def execute_one_instruction():
global DPC
global Mode
if not running:
if not Running:
Trace.dtrace('')
return 0
instruction = Memory.get(DPC, 0)
DPC = MASK_MEM(DPC + 1)
if mode == MODE_DEIM:
if Mode == MODE_DEIM:
Trace.trace(DEIMdecode(instruction >> 8) + '\t')
doDEIMByte(instruction >> 8)
if mode == MODE_DEIM:
if Mode == MODE_DEIM:
Trace.trace(DEIMdecode(instruction & 0xff) + '\t')
doDEIMByte(instruction & 0xff)
else:
@@ -114,14 +117,14 @@ def execute_one_instruction():
address = instruction & 007777
if opcode == 000: return page00(instruction)
elif opcode == 001: return i_DLXA(address)
elif opcode == 002: return i_DLYA(address)
elif opcode == 003: return i_DEIM(address)
elif opcode == 004: return i_DLVH(address)
elif opcode == 005: return i_DJMS(address)
elif opcode == 006: return i_DJMP(address)
elif opcode == 007: return illegal(instruction)
else: illegal(instruction)
elif opcode == 001: return i_DLXA(address)
elif opcode == 002: return i_DLYA(address)
elif opcode == 003: return i_DEIM(address)
elif opcode == 004: return i_DLVH(address)
elif opcode == 005: return i_DJMS(address)
elif opcode == 006: return i_DJMP(address)
elif opcode == 007: illegal(instruction)
else: illegal(instruction)
def illegal(instruction=None):
if instruction:
@@ -133,7 +136,7 @@ def illegal(instruction=None):
sys.exit(0)
def ison():
return running
return Running
def i_DDXM():
global DX
@@ -148,13 +151,15 @@ def i_DDYM():
Trace.dtrace('DDYM')
def i_DEIM(address):
mode = MODE_DEIM
global Mode
Mode = MODE_DEIM
Trace.deimtrace('DEIM', DEIMdecode(address & 0377))
doDEIMByte(address & 0377)
return 1
def i_DHLT():
running = False
Running = False
Trace.dtrace('DHLT')
def i_DHVC():
@@ -315,11 +320,11 @@ def page00(instruction):
return 1
def start():
global running
global Running
running = True
Running = True
def stop():
global running
global Running
running = False
Running = False