CBMCAL - A Commodore calendar application

A calendar tool for Commodore 8-bit computers from the 1980s, especially for the PETs/CBMs, but also for the C64, C128 and maybe others (C16?).

Features

• Month view, the user can select the month, an asterisk shows, if entries exist for a day.
• Day view, the user selects the day and adds/modifies/removes entries.
• Create whole-day calendar entries and entries with a time set.
• Integrated help screen.
• Remembers calendar entries on disk.
• Optionally remembers the last selected month on disk.
• In-code disk device and disk drive selection (e.g. for multiple connected and/or dual disk drives), can also be stored on disk.

Goals

• Make something that is not a game and makes (almost) sense to use, even on a PET/CBM.
• Support as much Commodore machines as possible (one reason for using BASIC).
• Keep it as simple as possible, self-explanatory and usable.

Tested with

• CBM/PET.
• C64.
• C128 (in C128 mode).

To-dos

• Prettify UI (at least use inverted font for some stuff).
• Improve performance (e.g. month view load).
• Reduce code size (in practice pretty easy by letting the cross-compiler remove all comments and spaces).
• Add support for repeating events.
• Make sure to workaround all disk drive bugs on all systems (e.g. 1541).
• Test on C16, etc.
• VIC20 screen width support?

Thanks go to ...

• ... Georg Rottensteiner for C64Studio.
• ... all the developers of VICE.
• ... STYLE for DirMaster.