About this MC68k assembler tool

This is an assembler program for the MC68000 microproccesor. When compiling, the existence of mnemonics and the validity of the used addressing modes are checked. The compiler generates a binary file starting with the first program address (2 bytes), the last address (2bytes) and the data length in bytes (2 bytes), and followed by the program and data bytes. This datastring can be send via a selectable serial port.

Special characters

';' comments => ; this is a comment
'@' prorgam address => @02B900 (6 character number)
'BNE.S *$F4' => branche offset
'#' data block => #B4,56,F7,22,01,C4,B4,9A

Error codes: ?_

A : Invalid mnemonic
B : Invalid or missing operand(s) or size attribute
D : Invalid program address
E : Erroneous data line
F : Non excisting destination label
G : Offset out of range
H : TRAP vector too large
I : Invalid data register number
J : Invalid size attribute
K : Immediate value to large

Addressing Modes Syntax

data register direct: Dn MOVE.W D1,$0100
address register direct: An MOVEA.L A5,A0
immediate: #$<value> MOVE.W #$1A24,D0
absolute short: $<4_char_address> MOVE.B $0802,D6
absolute long: $<8_char_address> MOVE.B $04A00226,D4
indirect: (An) MOVE.W (A2),D7
indirect with post-increment: (An)+ MOVE.W (A6)+,D1
indirect with pre-decrement: -(An) MOVE.W -(A1),D4
indirect with 16 bit offset: d16(An) MOVE.W $20C6(A4),D7
indirect with index and 8 bit offset: d8(An,Xn) MOVE.W $E4(A3,D1.W),D5
program counter relative with 16 bit offset: d16(PC) MOVE.W $7A12(PC),D0
program counter relative with index and 8 bit offset: d8(PC,Xn) MOVE.W $D4(PC,A2.L),D6

68k assembler

Terminal

Assembler

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9600 baud, 8 databits, 1 stopbit, odd parity

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Terminal