Mostly from UserGuide 00 Floppy PIO CS0 (data signalling?), Data Register, Ch A 01 Floppy PIO CS0, Command Register, Ch A 02Floppy PIO CS0, Data Register, Ch B 03 Floppy PIO CS0, Command Register, Ch B 04 Floppy PIO CS1 (command signalling?), Data Register, Ch A 05 Floppy PIO CS2, Command Register, Ch A 06Floppy PIO CS3, Data Register, Ch B 07 Floppy PIO CS4, Command Register, Ch B 08 CTC 0 (Takt for SIO) , Ch 00 09 CTC, Ch 01 0A CTC, Ch 02 0B CTC, Ch 03 0E SIO 0 (keyboard/printer/V24), Commands, Cha A 0F SIO, Commands, Ch B (V24/RS232) 0C SIO, Data, Ch A 0D SIO, Data, Ch B (V24/RS232) 10 CTC 1 (Takt for SIO 1IFFS?) , Ch 00 11 CTC, Ch 01 12 CTC, Ch 02 13 CTC, Ch 03 14 SIO 1 (IFFS?), Commands, Cha A 15 SIO, Commands, Ch B 16 SIO, Data, Ch A 17 SIO, Data, Ch B 18 CRT Parameter Register 19 CRT Command Register 1A CRT Parameter Register 1B CRT Command Register 20H-23H UG says: /KRFD, some other command FD command signalling 24h Turn on ROM (also 25,26,27) 28h Turn off ROM (also 29,2a,2b) 2Dh Smth strange called Abfrage LT107 (also 2F) 2Dh Smth strange called Abfrage LT107 (also 2F) 34h Video ROM switching (also 35,36,37) XEPb.org,
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