• System Data Area (0xbfc00--0xbffff) - Offset: Meaning.
  • 0x09-0e: S3-Data (Start,Size/4?,0x00)
  • 0x0f-14: S2-Data
  • 0x15-1a: S1-Data
  • 0x27/8: Position on Display X/Y
  • 0x29: Bit 6: Do not interpret characters in Range 0x00--0x1f. Bit 5: Character 0x0a acts as Line-Feed only.
  • 0x2c: Bit 7: Ignore OFF-Key. Bit 5: Ignore Keys having 0x00 as prefix.
  • 0x46-51: Function-Key file.
  • 0x5c: Contains the Status of the DE/G/RAD-Display.
  • 0x84/5/6: Points to location of INSERT-Cursor.
  • 0x8a-95: Pointer to current font.
  • 0x97: BATT-Display
  • 0x99: CAPS-Display
  • 0x9a: PRINT-Display
  • 0x9d/e: Rows/Columns on Display.
  • 0xa1: Reverse-Display, if Bit 6 is set.
  • 0x11a/b/c: Lower Address of Area being reserved for Machine-Language. Upper Address is 0xbfc00 always?
• Keyboard Area? (Starting at [(0xe6)+0x00], Default: ?)
• Basic Data (Starting at [?], Default: 0xbf21b)

Firstly, the one where the Basic-Interpreter holds his Data (Defaults to 0xbf21b--0xbfbff). If you reserved some Memory for Machine-Language, the region will end at 0xbfbff-Bytes Reserved for Machine Language. Firstly, the region, where System-Data is held, is found at 0xbfc00--0xbffff. 0xbfe00--0xbffff can be used by the user (sometimes!). System-Data: