ed6502asm

a 6502 cross assembler in pascal.
Under construction.
testing scanner, parser and codegenerator

usage: ./edASM file

For testing purposes all output comes on screen.

1. echoed code (and eventual error messages)
2. The translated code in Hex
3. A generated c64 basic text containing the translated program in DATA statements. This text can be cut & paste in the VICE emulator.

Version DEV 0.2

• multiple ORG bug OK
• Independed parsing of pseudoinstructions
• DB pseudo instruction
• EQU pseudo instruction
• support for characters and strings
• extended (cut & paste) BASIC loader (too complex ???)

To DO

• More testing required.
• Clean up code. (one file or separate units ?)
• Test if label is not used yet
• DS pseudoinstruction (skip memory) (with or without fill ?)
• simple independed output generator

Version DEV 0.1

Translates all (legal) instructions and memory modes.
Forward and backward labels are working
Two optional pseudo instructions provided:

• ORG (address to translate to. If ORG is ommited $C000 is used)
• END (end of program. Can be ommited when at end of file)

To Do

• More testing required.
• Clean up code.
• Parse pseudo instruction independently (since arguments are not regular memory modes)
• DB pseudoinstruction (insert Data Byte)
• support for characters and strings of characters

-- support for characters OK. now following is allowed

            LDA # '*'
START:      JSR $FFD2
            JMP START

-- DB pseudoinstruction OK
-- strings OK
-- the following program says hello world on a c64

; HELLO WORLD IN ED6502ASM

        LDX #0
LOOP:   LDA TEXT,X
        BEQ EXIT
        JSR $FFD2 ; PRINT THE CHARACTER IN A
        INX
        JMP LOOP
EXIT:   RTS
        
TEXT:   DB "HELLO WORLD",0