Apple-2-SW
/
a3a2em
mirror of https://github.com/brouhaha/a3a2em.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

Add comments about disk and memory organization.

This commit is contained in:
Eric Smith 2018-04-08 01:12:30 -06:00
parent 4332358b7b
commit ebd4d014b2
1 changed files with 26 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
a3a2em.asm
View File

@ -1,3 +1,29 @@
; Partially reverse-engineered code from the Apple II emulation disk for
; the Apple ///
; Code copyright Apple Computer
; Reverse-engineering (macros, functions, labels, comments) copyright 2018
; Eric Smith <spacewar@gmail.com>
; Cross-assemble with Macro Assembler AS:
; http://john.ccac.rwth-aachen.de:8000/as/
; Apple II emulation disk organization:
; disk scectors memory
; T00S0..T01S7 a000..b7ff boot, configuration, charset, emulation setup code
; T02S0..T09S5 2000..95ff ROM images
; T02S0..T02S2 2000..22ff peripheral card ROMs for slots 5-7
; T02Sb..T05Sa 2b00..5aff Programmer's Aid #1, Integer BASIC, monitor
; T05Sb..T05Sd 5b00..5dff peripheral card ROMs for slots 5-7
; T06S6..T09S5 6600..95ff Applesoft BASIC, monitor
; Apple /// boot ROM loads block zero (T00S0 and T00S1) to a000..a1ff
; that code loads T00S2..T01S7 to a200..b7ff
; loads ROM images from T02S0..T09S5 to 2000..95ff
; based on user configuration choices, copies selected ROM images to
; final locations
cpu 6502
fillto macro addr, val