6502 programs for Apple ][ 48k

This repo contains 6502 sources for various programs for Apple ][. They all compile with 64tass assembler.

xmodem

This implementation is inspired by this 6502 reference implementation but with a lot of simplifications and rewriting.

First it uses checksum and not CRC16 for compacity. Second it transfers only pages of 256 bytes. It's not a important limitations because xmodem requires 128 bytes packets.

Works great with rx/sx.

load8000

Routine to load at high speed from audio jack. Works with this special version of c2t

crc

Examples of differents CRC routines.

unlz4

LZ4 decompression routine adapted from https://github.com/pararaum/lz4-6502

diskload

WIP : transfer an dsk image to a real disk for Apple ][ 48k. Uses lz4 compression for efficiency. Use -d option in c2t for audio trnsfer. Serial transfer with xmodem in future.

disksave

WIP : create an dsk image from a real (standard) disk. Transfer via serial. Actually ser.py in this repo. Will use xmodem in future.

apple directory

Contains all sources for compiling integer ROM and Apple ][+ ROM. Fix 4 errors in integer basic in this commit