;**	Z207 EQUATES
;

	NOLIST
;
;		  RESTRICTED RIGHTS LEGEND
;		  ------------------------
;
;	     "Use, duplication, or disclosure by the
;	government is subject to restrictions as set forth
;	in paragraph (b) (3) (B) of the Rights in Technical
;	Data and Computer Software clause in DAR
;	7-104.9(a).  Contractor/manufacturer is Zenith
;	Data Systems Corporation of Hilltop Road, St.
;	Joseph, Michigan 49085.
;
	LIST

;	PORT ASSIGNMENTS

FDBASE	EQU	0B0H		;BASE PORT ADDRESS
FDCMD	EQU	FDBASE		;1797 COMMAND REGISTER
FDSTA	EQU	FDBASE		;     STATUS REGISTER
FDTRK	EQU	FDBASE+1	;     TRACK REGISTER
FDSEC	EQU	FDBASE+2	;     SECTOR REGISTER
FDDAT	EQU	FDBASE+3	;     DATA REGISTER
FDCON	EQU	FDBASE+4	;DISK CONTROL PORT
FDAS	EQU	FDBASE+5	;AUX STATUS PORT

;	COMMANDS

FDCRST	EQU	000H		;RESTORE
FDCSEK	EQU	010H		;SEEK
FDCSTP	EQU	020H		;STEP
FDCSTI	EQU	040H		;STEP IN
FDCSTO	EQU	060H		;STEP OUT
FDCRDS	EQU	080H		;READ SECTOR
FDCWRS	EQU	0A0H		;WRITE SECTOR
FDCRDA	EQU	0C0H		;READ ADDRESS
FDCRDT	EQU	0E0H		;READ TRACK
FDCWRT	EQU	0F0H		;WRITE TRACK
FDCFI	EQU	0D0H		;FORCE INTERRUPT

;	TYPE 1 COMMAND FLAGS

FDFUTR	EQU	00010000B	;UPDATE TRACK REGISTER
FDFHLB	EQU	00001000B	;HEAD LOAD AT BEGINNING
FDFVRF	EQU	00000100B	;VERIFY FLAGS

;	TYPE 1 COMMAND STEP RATE FLAGS

FDFSRM	EQU	00000011B	;STEP RATE MASK
FDFS6	EQU	00000000B	;STEP RATE  6(3) MS
FDFS12	EQU	00000001B	;          12(6)
FDFS20	EQU	00000010B	;          20(10)
FDFS30	EQU	00000011B	;          30(15)

;	TYPE 2&3 COMMAND FLAGS

FDFMRF	EQU	00010000B	;MULTIPLE RECORD FLAG
FDFSLF	EQU	00001000B	;SECTOR LENGTH FLAG
FDFDLF	EQU	00000100B	;30 MS DELAY
FDFSS1	EQU	00000010B	;SELECT SIDE 1
FDFDDM	EQU	00000001B	;DELETED DATA MARK

;	TYPE 4 COMMAND FLAGS

FDFINI	EQU	00000000B	;TERMINATE WITH NO INTERRUPT
FDFII0	EQU	00000001B	;NOT READY TO READY TRANSITION
FDFII1	EQU	00000010B	;READY TO NOT READY TRANSITION
FDFII2	EQU	00000100B	;INDEX PULSE
FDFII3	EQU	00001000B	;IMMEDIATE INTERRUPT

;	STATUS FLAGS

FDSNRD	EQU	10000000B	;NOT READY
FDSWPV	EQU	01000000B	;WRITE PROTECT VIOLATION
FDSHLD	EQU	00100000B	;HEAD IS LOADED
FDSRTE	EQU	00100000B	;RECORD TYPE
FDSWTF	EQU	00100000B	;WRITE FAULT
FDSSEK	EQU	00010000B	;SEEK ERROR
FDSRNF	EQU	00010000B	;RECORD NOT FOUND
FDSCRC	EQU	00001000B	;CRC ERROR
FDSTK0	EQU	00000100B	;FOUND TRACK 0
FDSLDT	EQU	00000100B	;LOST DATA
FDSIND	EQU	00000010B	;INDEX HOLE
FDSDRQ	EQU	00000010B	;DRQ
FDSBSY	EQU	00000001B	;BUSY

;	INFO RETURNED BY A READ ADDRESS COMMAND

FDRATRK	EQU	0		;TRACK
FDRASID	EQU	1		;SIDE
FDRASEC	EQU	2		;SECTOR
FDRASL	EQU	3		;SECTOR LENGTH
FDRACRC	EQU	4		;2 BYTE CRC
FDRAL	EQU	6		;LENGTH OF READ ADDRESS INFO

;	DISK HEADER SECTOR LENGTH VALUES

FDSL128	EQU	0		;SECTOR LENGTH 128
FDSL256	EQU	1		;SECTOR LENGTH 256
FDSL512	EQU	2		;SECTOR LENGTH 512
FDSL1K	EQU	3		;SECTOR LENGTH 1024

;	CONTROL REGISTER FLAGS

CONDS	EQU	00000011B	;DRIVE SELECT BITS
CONDS8	EQU	00000100B	;0=5 1/4" , 1=8"
CONDSEN	EQU	00001000B	;DRIVE SELECT ENABLE
CONPC	EQU	00010000B	;WRITE PRE-COMPENSATION
				; 5 1/4"  0=YES , 1=NO
				; 8"  0=ALL TRACKS , 1=TRACKS 44-76
CON5FS	EQU	00100000B	;5 1/4" FAST STEP
CONWE	EQU	01000000B	;ENABLE WAIT FOR DRQ OR IRQ
CONSD	EQU	10000000B	;ENABLE SINGLE DENSITY

;	AUXILARY STATUS REGISTER FLAGS

ASIRQ	EQU	00000001B	;1797 INTERRUPT REQUEST
ASMO	EQU	00000010B	;5 1/4" MOTOR ON
AS96T	EQU	00001000B	;5 1/4" DRIVES ARE 96TPI
AS5PC	EQU	00010000B	;5 1/4" DRIVES NEED WRITE PRE-COMPENSATION
AS2S	EQU	01000000B	;SELECTED 8" DRIVE CONTAINS 2 SIDED MEDIA
ASDRQ	EQU	10000000B	;1797 DRQ

;	MISCELLANEOUS VALUES

NTRKS37	EQU	40		;# TRACKS SINGLE DENSITY 5 1/4" (48 TPI)
NTRKD37	EQU	80		;# TRACKS DOUBLE DENSITY 5 1/4" (96 TPI)
NTRK837	EQU	77		;NUMBER OF TRACKS 8"
NSBT37	EQU	52		;NUMBER OF CP/M RECORDS TO BE LOADED AT BOOT