drives/
  Disk drive firmware

schematics/
  VIC-20 and VIC-20CR schematic diagrams

README
  VIC-20 parts and firmware versions

basic.901486-01.bin
  Commodore VIC-20 BASIC V2.  The first and only version.

characters.901460-03.bin
  Commodore VIC-20 character generator ROM.

characters.NecP22101-207.bin
  Commodore VIC-20 character generator ROM for Swedish/Finnish character set.

kernal.901486-06.bin
  Commodore VIC-20 KERNAL ROM, revision 6.  Intended for NTSC-M systems.
  Probably not the first revision.  But not the sixth revision either,
  since the BASIC ROM has the same part number.

kernal.901486-07.bin
  Commodore VIC-20 KERNAL ROM, revision 7.  Intended for PAL-B systems.
  Probably the last revision.

kernal.NecP22081-206.bin
  Commodore VIC-20 KERNAL ROM, 901486-07 version patched for Swedish/Finnish
  keyboard and character set.  Chip markings: NEC JAPAN P22489-207 /
  D2364C 689 UE12 (Yes, it is a 8kb*8 mask-programmable ROM!).

kernal.differences
  Lists the differences between the VIC-20 KERNAL ROMs 901486-06 and
  901486-07.