; I/O port definitions for Monroe "Monty" microcomputer
;

IO$FDCTL EQU	0C0H		; Floppy external control
IO$FDST	 EQU	0B0H		; Floppy status
IO$FDCMD EQU	0B0H		; Floppy command
IO$FDTRK EQU	0B1H		; Floppy track register
IO$FDSEC EQU	0B2H		; Floppy sector register
IO$FDATA EQU	0B3H		; Floppy data register

FSBUSY	 EQU	1		; FD busy
FSDRQ	 EQU	2		; Data request
FSDLOST	 EQU	4		; Data lost
FSCRC	 EQU	8		; CRC error
FSRNF	 EQU	16		; Record not found
FSWFLT	 EQU	32		; Write fault
FSWPROT	 EQU	64		; Write protect
FSNRDY	 EQU	128		; Not ready

FDSEL	 EQU	00FH		; Select bits
FDSIDE	 EQU	010H		; Side select
FDMON	 EQU	020H		; Motor on
FDPREC	 EQU	040H		; Precompensation on
FDENAB	 EQU	080H		; FD 179X enable (un-reset)

FCRZS	 EQU	000H		; Return to zero seek
FCSEEK	 EQU	018H		; Seek
FCSTIN	 EQU	038H		; Step in
FCSTOT	 EQU	078H		; Step out
FCREAD	 EQU	080H		; Read sector
FCWRIT	 EQU	0A0H		; Write sector
FCRADR	 EQU	0C0H		; Read address
FCFMT	 EQU	0F4H		; Format track
FCFINT	 EQU	0D0H		; Force interrupt
FCVERF	 EQU	004H		; Verify option
FCSID0	 EQU	002H		; Verify side 0

IO$DMA	 EQU	0ACH		; DMA control register

IO$PMAPA EQU	0C4H		; Program map A base
IO$PMAPB EQU	0C5H		; Program map B base
IO$DMAPA EQU	0C6H		; DMA map A base
IO$DMAPB EQU	0C7H		; DMA map B base

IO$HSTRT EQU	0D8H		; Hi-res start
IO$HCOL	 EQU	0D4H		; Hi-res color

IO$SYS	 EQU	0C8H		; Map and system control

IO$CRTA	 EQU	0B8H		; CRT register select
IO$CRTD	 EQU	0B9H		; CRT data register

IO$PIOAD EQU	0B4H		; PIO A data
IO$PIOAC EQU	0B5H		; PIO A command

IO$DRTAD EQU	0A0H		; DART A (printer) data
IO$DRTAC EQU	0A1H		; DART A command
IO$DRTBD EQU	0A2H		; DART B (keyboard) data
IO$DRTBC EQU	0A3H		; DART B command

IO$SIOAD EQU	0A4H		; SIO A (comm) data
IO$SIOAC EQU	0A5H		; SIO A command
IO$SIOBD EQU	0A6H		; SIO B (RS-232C) data
IO$SIOBC EQU	0A7H		; SIO B command

IO$CTC0	 EQU	0A8H		; CTC CHANNEL 0 - Communications baud rate
IO$CTC1	 EQU	0A9H		; CTC CHANNEL 1 - AUX RS-232C baud rate
IO$CTC2	 EQU	0AAH		; CTC CHANNEL 2 - Printer baud rate
IO$CTC3	 EQU	0ABH		; CTC CHANNEL 3 - Real-Time Clock