CH1DMA	= 64H		; CHANNEL 1 DMA REGISTER (FDC)
CH1TC	= 65H		; CHANNEL 1 TERMINAL COUNT (FDC)
DMACTL	= 68H		; DMA COMMAND AND STATUS REGISTER
DMAMOD	= 6BH		; DMA MODE REGISTER
DMACLR	= 6DH		; DMA MASTER-CLEAR REGISTER
DMAMSK	= 6FH		; DMA MASK ALL CHANNELS REGISTER
DSKSEL	= 0A8H		; DISK SELECT PORT
FDCST	= 0A0H		; DISK CONTROLLER STATUS (uPD-765)
FDCDAT	= 0A2H		; DISK CONTROLLER DATA (uPD-765)
;
CH2EN1	= 10H		; DMA CHANNEL 2 ENABLE COMMAND #1
CH2EN3	= 0BH		; DMA CHANNEL 2 ENABLE COMMAND #3
DMAVFY	= 52H		; DMA VERIFY COMMAND
DMARD	= 56H		; DMA READ COMMAND
DMAWR	= 5AH		; DMA WRITE COMMAND
;
FDCSFY	= 03H		; FDC SPECIFY COMMAND
FDCSDS	= 04H		; FDC SENSE DRIVE STATUS COMMAND
FDCRCL	= 07H		; FDC RECALIBRATE COMMAND
FDCSIS	= 08H		; FDC SENSE INTERRUPT STATUS COMMAND
FDCRID	= 0AH		; FDC READ ID COMMAND
FDCFMT	= 0DH		; FDC FORMAT TRACK COMMAND
FDCSK	= 0FH		; FDC SEEK COMMAND
FDCWR	= 05H		; FDC WRITE COMMAND
FDCRD	= 06H		; FDC READ COMMAND
;
DSKENI	= 0F5H		; DISK CONTROLLER ENABLE INTERRUPTS
;
FDCMFM	= 6		; FDC DOUBLE-DENSITY BIT
FDCMT	= 7		; FDC MULTI-TRACK BIT
;
FDCBSY	= 4		; FDC BUSY STATUS
FDCSE	= 5		; FDC SEEK END
FDCOUT	= 6		; FDC OUTPUT MODE
FDCRDY	= 7		; FDC READY FOR DATA
;
SRT8Q	= 3		; 8 INCH FDD STEP RATE (3 MS-QUME)
SRT8S	= 8		; 8 INCH FDD STEP RATE (8 MS-SHUG)
SRT5P	= 1		; 5.25 INCH FDD STEP RATE (1 MS-PHIL)
;
HDLT	= 0   		; FDD HEAD LOAD TIME 
HDUT	= 0		; FDD HEAD UNLOAD TIME
;
ST0NR	= 3		; STATUS REGISTER 0 NOT READY
ST0EC	= 4		; STATUS REGISTER 0 EQUIPMENT CHECK
ST0SE	= 5		; STATUS REGISTER 0 SEEK END
;
ST1MA	= 0		; STATUS REGISTER 1 MISSING ADDRESS MARK
ST1NW	= 1		; STATUS REGISTER 1 NOT WRITABLE
ST1ND	= 2		; STATUS REGISTER 1 NO DATA
ST1OR	= 4		; STATUS REGISTER 1 OVER RUN
ST1DE	= 5		; STATUS REGISTER 1 DATA ERROR
;
ST3TS	= 3		; STATUS REGISTER 3 TWO SIDED
ST3T0	= 4		; STATUS REGISTER 3 TRACK 0
ST3RDY	= 5		; STATUS REGISTER 3 READY
ST3WP	= 6		; STATUS REGISTER 3 WRITE PROTECTED
;
TSD	= 2		; TWO-SIDED DISK BIT (TYPE CODE)
DDD	= 3		; DOUBLE DENSITY DISK BIT (TYPE CODE)
;
MINI	= 4		; MINI-FLOPPY DISK BIT (TYPE CODE)
;
