v6502 mini-assembler in Apple-1 emulator
Posted: 27 Jan 2020, 23:26
For those interested in software developments, our Apple-1 emulation now includes not just the Baum/Wozniak disassembler as published in DrDobbs, but also their famous mini-assembler back ported from Apple ][. With this you can enter MOS 6502 mnemonics on the Gigatron itself and execute them without having to remember the opcodes.
Usage:
Believe it or not, the whole package fits in about 850 bytes.
Details in de 6502 forum, where all the work was done. Thanks a million to Mike T. Barry.
http://forum.6502.org/viewtopic.php?f=2&t=5884
BTW: we do have a working ROR instruction on this one, so v6502 isn't really authentic
Usage:
Code: Select all
D13R Enter mini-assembler (provisional)
Prompt is now '!'
!addr ins Assemble instruction to address
!<space> ins Assemble next instruction
!addrL Disassemble from address
!L Disassemble next page
!<cr> Return to wozmon
Details in de 6502 forum, where all the work was done. Thanks a million to Mike T. Barry.
http://forum.6502.org/viewtopic.php?f=2&t=5884
BTW: we do have a working ROR instruction on this one, so v6502 isn't really authentic