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Apple II software

This is a collection of code used for Apple II archaeology of various kinds.

Component files

• appleII.asd The system definition.
• circular-sequence.lisp Code to support various operations on circular sequences, including a naive search for a subsequence. This is useful to deal with emulated disk track images, which are circular in real life.
• disasm6502.lisp Basic 6502 disassembly
• disasm6502-oo.lisp Support for symbolic disassembly, including auto-generated labels, screen and high-bit ASCII text, and hex data dump sections.
• nibimage.lisp Code to deal with NIB binary disk images, extracting the de-nibblized data sectors.
• dskimage.lisp Code to deal with normalized Apple DOS 3.3 or ProDOS disk images, extracting various files from the DOS images.
• applesoft.lisp Code to de-tokenize binary format AppleSoft BASIC programs.
• diskcopy_image.lisp Basic support to read Prodos images in DiskCopy 4.2 format
• asm6502.lisp Beginnings of a Lisp-syntax 6502 assembly language. Couldn't figure out a simply way to handle symbolic math and instruction length variations, including forward-referenced labels.

Example files

• zorknib.lisp Code to deal with non-standard format of Infocom games for the Apple II.
• zil-disasm.lisp Code to disassemble ZIL-language Infocom adventures.
• sst-disasm.lisp Example code using the disasm6502-oo code to disassemble the Super Saltine Transcopy program

Comments

The disk image code should ideally be abstracted into a generic file system, including writing files to images on disk. This turns out to be a potentially very complex undertaking. Those interested in a very interesting approach to 6502 assembly should consider Baker's COMFY-6502.