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Joshua Bell ac7639499b DeskTop S4: Simplify use of no-param relay macro calls
2017-12-30 20:22:40 -08:00
..
infos Desktop: Improve s4 infos 2017-12-30 18:02:15 -08:00
orig DeskTop: Combine 3 aux segments into one file 2017-10-09 19:15:17 -07:00
res Clean up directories, start work mapping DESKTOP2 2017-09-16 17:11:50 -07:00
.gitignore Add .gitignore for DeskTop dir 2017-09-18 20:31:16 -07:00
go.sh Desktop S4: Identify strings 2017-12-30 19:21:34 -08:00
Makefile Add keyboard docs 2017-12-15 21:35:49 -08:00
README.md DeskTop: menu structure, labels 2017-10-10 08:21:32 -07:00
s0_loader.s Desktop: Improve s4 infos 2017-12-30 18:02:15 -08:00
s4_main1.s DeskTop S4: Simplify use of no-param relay macro calls 2017-12-30 20:22:40 -08:00
s123_aux.s DeskTop S4: Wrap A2D_RELAY use in macros 2017-12-30 19:59:27 -08:00

README.md

DeskTop diassembly notes

DESKTOP.SYSTEM

A short (8k) loader program. This is likely responsible for copying the rest to a RAM card (if available), then invoking the main app.

DESKTOP2.$F1

This is large - 111k. It includes a loader, the DeskTop app (with both main memory and aux memory segments, filling everything from $4000 to $FFFF (except for I/O space and ProDOS), and still having more code - probably the disk copy code which is swapped in dynamically.

The file is broken down into multiple segments:

  • segment 0: load - offset $0000, length $0580, loaded at $2000
  • segment 1: aux1 - offset $0580, length $8000, loaded at $4000 (through $BFFF)
  • segment 2: aux2 - offset $8580, length $1D00, loaded at $D000 (through $ECFF)
  • segment 3: aux2 - offset $A280, length $0500, loaded at $FB00 (through $FFFF)
  • segment 4: main - offset $A780, length $7F00, loaded at $4000 (through $BEFF)
    • main $BF00-$BFFF is ProDOS buffers
    • main $C000-$CFFF is I/O space
    • main $D000-$FFFF is ProDOS
  • segment 5: TBD - 38k so must be further subdivided. Disk Copy???

Structure

GUI Library "A2D"

AUX $4000-$8DFF is the GUI library used for the DeskTop application and (presumably) for disk copy and Selector apps (TBD).

Entry point is $4000 with a ProDOS MLI-style calling convention

  • Font is at $8800

"DeskTop" Application

AUX $8E00-$FFFF (with hole at $C000-$CFFF for I/O and at $ED00-$FAFF for data buffer) is the DeskTop application itself, with desktop and file icons, menus, dialogs, and so on.