• Added support for a software 80 column screen mode
  • F8 now cycles: 40c PETSCII -> 40c ASCII -> 80c PETSCII -> 80c ASCII
  • All menus, transfers etc. temporarily switch back to 40 col screen. The 80 column contents will be preserved when temporarily switching.
  • In 80 color ASCII mode, the characters ^_`{|}~ are available, matching ASCII (unlike 40 col ASCII).
• Fixed ASCII-PETSCII conversion of codes 0x60 and 0x7B
• Changed some wording to be clearer (imho):
  • "Graphics" and "C/G" to "PETSCII"
  • "Anscii" to "ASCII"
  • "Author's Message" to "Instructions"
• Internal changes
  • rewrote RS232 driver model
  • cleaned up code memory layout

Additional changes since CCGMS 2021:

• Fixed timing for PAL in User Port and UP9600 drivers
• Implemented XMODEM-1K
• XMODEM-CRC autodetect on upload