; Basic I/O System definition - INCLUDEd in each module
; Assumes a CPU Support card at F0 hex for character I/O

; Select whether console input is interrupt-driven or polled.
INTINP		EQU	1
QSIZE		EQU	100		; Input queue size.

; Select whether the auxiliary port is the Support Card parallel port
; or the second channel of a Multiport Serial card addressed at 10H.

PARALLELAUX	EQU	0
SERIALAUX	EQU	1

; Select whether the printer is connected to the Support card parallel
; output port (standard) or the first channel of a Multiport Serial card
; addressed at 10H.

PARALLELPRN	EQU	0
SERIALPRN	EQU	1

; If the Multiport Serial was chosen for either the auxiliary or the
; printer, select the baud rate here, using a hex value from this table:
;
;	  50	0	 150	4	1800	8	4800	C
;	  75	1	 300	5	2000	9	7200	D
;	 110	2	 600	6	2400	A	9600	E
;	 134.5	3	1200	7	3600	B      19200	F

PRNBAUD EQU	0EH		; 9600 baud
AUXBAUD EQU	0EH		; 9600 baud


; Disk options for MS-DOS 2.0 selected here
;************************************************************

; If you have a hard disk select it here. If you want the driver
; to be installable (installed at boot time) then select INSTALL
; also. 

IMI	EQU	0
SCRIBE	EQU	1
HARD	EQU	IMI OR SCRIBE 

INSTALL	EQU	1

;************************************************************

; Select disk controller here.

SCP		EQU	0
TARBELL 	EQU	1	;Select only LARGE below

; Select disk configuration:

LARGE	EQU	1		; Two large drives.
COMBIN  EQU	0		; Two 8-inch and one 5-inch.
SMALL	EQU	0		; Three 5-inch drives.

MAXLARGE	EQU	2	;Number of 8" when LARGE is selected
MAXSMALL	EQU	3	;Number of 5" when SMALL is selected
MAXLARGECOMB	EQU	2	;Number of 8" when COMBIN is selected
MAXSMALLCOMB	EQU	1	;Number of 5" when COMBIN is selected

LARGDRV	EQU	LARGE OR COMBIN
SMALLDRV EQU	SMALL OR COMBIN

LDRVMAX	EQU	MAXLARGE*LARGE+MAXLARGECOMB*COMBIN	; # of 8" drives
SDRVMAX	EQU	MAXSMALL*SMALL+MAXSMALLCOMB*COMBIN	; # of 5" drives
HDRVMAX	EQU	HARD		; # of hard disk drives

;************************************************************

; If your disk drives support DISKCHANGE signal and 2 SIDED signal and 
; you have a SCP disk controller, then select these options here.
; MS-DOS will use these signals to automatically select single or
; double sided drives.  These are ignored for PerSci drives.

DISKCHG	EQU	0
TWOSIDE	EQU	0

;*************************************************************

; Select double-sided operation of 8-inch disks in double-density mode.
; Select this option only if TWOSIDE is not used (or PERSCI is set).

LARGEDS	 EQU	1

;************************************************************

; Select whether FORMAT defaults to single- or double-sided for 5" disks.
; (This can always be overridden with the /1 or /2 switches.)

SMALLDS	 EQU	1

;***********************************************************
; If 8-inch drives are PerSci, select here:

PERSCI	EQU	0

;************************************************************


; Use table below to select head step speed. Step times for 5" drives
; are double that shown in the table. Times for Fast Seek mode (using
; PerSci drives) is very small - 200-400 microseconds.
;
; Step value	1771	1793
;
;	0	  6ms	3ms
;	1	  6ms	6ms
;	2	 10ms	10ms
;	3	 20ms	15ms

STPSPD  EQU	0

;************************************************************

SIDECHK	EQU	TWOSIDE AND (PERSCI-1) AND SCP AND LARGDRV
DSKCHG	EQU	DISKCHG AND (PERSCI-1) AND SCP AND LARGDRV

BIOSSEG EQU	40H		; I/O system segment.
BASE	EQU	0F0H
SIOBASE EQU	10H
STAT	EQU	BASE+7
DATA	EQU	BASE+6
DAV	EQU	2
TBMT	EQU	1
SERIAL  EQU	SERIALPRN+SERIALAUX
STCDATA EQU	BASE+4	  ; Ports for 9513 Timer chip.
STCCOM  EQU	BASE+5

	IF	SERIALAUX
AUXSTAT EQU	SIOBASE+3
AUXDATA EQU	SIOBASE+2
	ENDIF

	IF	PARALLELAUX
AUXSTAT EQU	BASE+13
AUXDATA EQU	BASE+12
	ENDIF

	IF	SERIALPRN
PRNSTAT EQU	SIOBASE+1
PRNDATA EQU	SIOBASE+0
	ENDIF

	IF	PARALLELPRN
PRNSTAT EQU	BASE+13
PRNDATA EQU	BASE+12
	ENDIF

;define offsets for IO data packet
IODAT	STRUC
CMDLEN  DB	?	;LENGTH OF THIS COMMAND
UNIT	DB	?	;SUB UNIT SPECIFIER
CMD	DB	?	;COMMAND CODE
STATUS  DW	?	;STATUS
	DD	2 DUP (?)
MEDIA	DB	?	;MEDIA DESCRIPTOR
TRANS	DD	?	;TRANSFER ADDRESS
COUNT	DW	?	;COUNT OF BLOCKS OR CHARACTERS
START	DW	?	;FIRST BLOCK TO TRANSFER
IODAT	ENDS