Start 6809.

This commit is contained in:
Jeff Tranter 2015-07-02 22:03:50 -04:00
parent a80f3dfb6a
commit 019b85a0e4
4 changed files with 99 additions and 5 deletions

94
6809.py Executable file
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@ -0,0 +1,94 @@
##########################################################################
#
# Processor specific code
# CPU = "6809"
# Description = "Motorola 6809 8-bit microprocessor."
# DataWidth = 8 # 8-bit data
# AddressWidth = 16 # 16-bit addresses
# Maximum length of an instruction (for formatting purposes)
maxLength = 4
# Leadin bytes for multbyte instructions
leadInBytes = [0x10]
# Addressing mode table
addressModeTable = {
"inherent" : "",
"imm8" : "#${0:02X}",
"imm16" : "#${0:02X}{1:02X}",
"direct" : "${0:02X}",
"indexed" : "${0:02X},x",
"extended" : "${0:02X}{1:02X}",
"rel8" : "${0:04X}",
"rel16" : "${0:02X}{1:02X}",
# Extended Indirect
# Relative Indirect
# Zero-offset Indexed
# Zero-offset Indexed Indirect
# Constant-offset Indexed
# Constant-offset Indexed Indirect
# Accumulator-offset Indexed
# Accumulator-offset Indexed Indirect
# Auto-Increment Indexed
# Auto-Increment Indexed Indirect
# Auto-Decrement Indexed
# Auto-Decrement Indexed Indirect
}
# Op Code Table
# Key is numeric opcode (possibly multiple bytes)
# Value is a list:
# # bytes
# mnemonic
# addressing mode.
# flags (e.g. pcr)
opcodeTable = {
0x3a : [ 1, "abx", "inherent" ],
0x89 : [ 2, "adca", "imm8" ],
0x99 : [ 2, "adca", "direct" ],
0xa9 : [ 2, "adca", "indexed" ],
0xb9 : [ 3, "adca", "extended" ],
0xc9 : [ 2, "adcb", "imm8" ],
0xd9 : [ 2, "adcb", "direct" ],
0xe9 : [ 2, "adcb", "indexed" ],
0xf9 : [ 3, "adcb", "extended" ],
0x8b : [ 2, "adda", "imm8" ],
0x9b : [ 2, "adda", "direct" ],
0xab : [ 2, "adda", "indexed" ],
0xbb : [ 3, "adda", "extended" ],
0xcb : [ 2, "addb", "imm8" ],
0xdb : [ 2, "addb", "direct" ],
0xeb : [ 2, "addb", "indexed" ],
0xfb : [ 3, "addb", "extended" ],
0xc3 : [ 3, "addd", "imm16" ],
0xd3 : [ 2, "addd", "direct" ],
0xe3 : [ 2, "addd", "indexed" ],
0xf3 : [ 3, "addd", "extended" ],
0x84 : [ 2, "anda", "imm8" ],
0x94 : [ 2, "anda", "direct" ],
0xa4 : [ 2, "anda", "indexed" ],
0xb4 : [ 3, "anda", "extended" ],
0xc4 : [ 2, "andb", "imm8" ],
0xd4 : [ 2, "andb", "direct" ],
0xe4 : [ 2, "andb", "indexed" ],
0xf4 : [ 3, "andb", "extended" ],
0x1C : [ 2, "andcc","imm8" ],
0x26 : [ 2, "bne", "rel8", pcr ],
0x26 : [ 2, "bne", "rel8", pcr ],
0x1026 : [ 4, "lbne", "rel16", pcr ],
0x00 : [ 2, "neg", "direct" ],
0xff : [ 3, "stu", "extended" ],
}
# End of processor specific code
##########################################################################

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@ -21,7 +21,7 @@ CPU Status
6800 done
6809 planned
6809 started
6811 done

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@ -90,9 +90,10 @@ except FileNotFoundError:
# line - line to output
# leadin - extended opcode (true/false)
s = " "
# Print initial origin address
if args.nolist is False:
s = " "
print("{0:04X}{1:s}.org ${2:04X}".format(address, s[0:maxLength*3+3], address))
else:
print(" .org ${0:04X}".format(address))
@ -103,7 +104,6 @@ while True:
if len(b) == 0: # handle EOF
if args.nolist is False:
s = " "
print("{0:04X}{1:s}end".format(address, s[0:maxLength*3+3]))
break
@ -202,7 +202,7 @@ while True:
# Handle case where invalid opcode has a leadin byte.
if leadin is True:
if args.nolist is False:
mnemonic = " .byte ${0:02X},${1:02X}".format(opcode // 256, opcode % 256)
mnemonic = "{0:s}.byte ${1:02X},${2:02X}".format(s[0:(maxLength-length-2)*3], opcode // 256, opcode % 256)
else:
mnemonic = ".byte ${0:02X},${1:02X}".format(opcode // 256, opcode % 256)
else:

2
z80.py
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@ -8,7 +8,7 @@
# AddressWidth = 16 # 16-bit addresses
# Maximum length of an instruction (for formatting purposes)
maxLength = 3
maxLength = 4
# Leadin bytes for multibyte instructions
leadInBytes = [0xcb, 0xdd, 0xed, 0xfd]