;;	excbiose.lib
;
;	these are common equates for the BIOS
;

; 1983-06-23	set for 2nd release
; 1983-06-83	added equ's for device time-out

sys	equ	0	;	port to get/set crnt bank
sysb	equ	3	;	port to set clock frequency


;	equates for various drive types

dsks1	equ	5		; 256 byte sector sssd
dskd1	equ	0ch		; 1024 byte sector ssdd
xerox	equ	1		; 128 byte sector sssd
ibm	equ	8		; 512 byte sector ssdd
dec	equ	8		; 512 byte sector ssdd (+1/track)


;	equates for serial device table characteristics

devin	equ	1		; input device
devout	equ	2		; output device
devbaud	equ	4		; selectable baud rate
devser	equ	8		; serial device (xon possible?)
devxact	equ	16		; xon/xoff active


;	equates to rom routines used

rsec	equ	5ah		; bios level read sector
wsec	equ	5dh		; bios level write sector
senden	equ	60h		; sense denisty

;	serial device routines

setbaud	equ	24h		; set baud rate serial A or B

skey	equ	03h		; kbd status
ci	equ	06h		; kbd input
cout	equ	09h		; console output

serain	equ	18h		; modem input (A)
saistat	equ	0ch		; modem input status (A)
seraout	equ	1eh		; modem output (A)
saostat	equ	12h		; modem output status (A)

serbin	equ	1bh		; printer input (B)
sbistat	equ	0fh		; printer input status (B)
serbout	equ	21h		; printer output (B)
sbostat	equ	15h		; printer output status (B)

parinp	equ	51h		; centronics input
pistat	equ	4bh		; centronics input status
parout	equ	54h		; centronics output
postat	equ	4eh		; centronics output status


;	ieee 488 interface rom routines

ieistat	equ	3fh		; input device status
ieostat	equ	42h		; output device status
ieinp	equ	45h		; input char
ieout	equ	48h		; output char


;	the following are equates to absolute ram areas
;	used by the rom

dmabank	equ	0fd4ah	; bank for disk xfr
dmadr	equ	0fd4bh	; disk dma address
actsec	equ	0fd4dh	; sector
acttrk	equ	0fd4eh	; track
actdsk	equ	0fd50h	; disk unit
acttyp	equ	0fd51h	; sector size

rommove	equ	0fd44h		; address of rom's move routine
rsbank	equ	0fd56h		; 	source bank
rdbank	equ	rsbank+1	;	destination bank

ieadr	equ	0fd52h		; ieee device address

;	the following address defines an area in common
;	as follows:
;		ds	60	Only this many bytes ---> watch out
;	tbuf:	ds	100h	(for xmove use)
;
;	therefore, this area is being used cautiously for 
;	various stack usage.

tbuf	equ	0fddch		; start of xmove buffer

;	this stack is used by xmove or serial i/o

savesp	equ	tbuf-2		; place to save incoming sp
comnsp	equ	savesp		; and a common stack area

;	this stack is used by disk i/o routines
;	because of error messages it is a different stack

dsksave	equ	tbuf+64		; another 64 byte area
dsksp	equ	dsksave		; and its stack


;	these are areas in rom's ram which are really
;	primarily used during serial i/o and during
;	cold boot time for initialization.  They are
;	included here so that any changes to the rom
;	require only this file to be changed.

clkptr	equ	2000h		; ptr to seconds field of time-of-day
media	equ	clkptr+2	; ptr to media changed byte w/in scb
adrive	equ	media+2		; ptr to media change byte drive A (built-in)
bdrive	equ	adrive+2	; ptr to media change byte drive B (built-in)


kbdtbl	equ	200ah		; kbd masks and decode tables (11+320)
				; immediately followed by fcn key table (512)

hertz	equ	2355h		; clock frequency (50 or 60)
;				this is followed by cursor type, bg type
;				and key click.  These are init'ed differently.


;	these are the protocol bytes for the rom handling
;	the xon/etx protocol.

aproto	equ	2008h		; serial A protocol byte
bproto	equ	aproto+1	; serial B protocol byte
romxon	equ	1		; indicates xon protocol used
rometx	equ	2		; indicates etx protocol used


romver	equ	00feh		; 2 byte rom version number
				; of the form:  DW ydddH  (year day day day)
romprod	equ	romver-2	; rom's product code and feature code




;	special override equates
;	these specify the area on sector 5 track 1 (after ccp)
;	which allow the disk to override the assembly of
;	various tables.  The table begins with the 2 byte
;	version number of the bios.  No overrides are processed
;	unless the number from the diskette matches our own number.
;	This is because the tables being overriden contain
;	actual memory addresses.  The remainder of the table
;	is best described by the following equates.


ivers	equ	0			; version number must match

idrvtbl	equ	ivers+2			; drvtbl tbl of dph ptrs
idrvlen	equ	16*2			; length of data part

idevtbl	equ	idrvtbl+idrvlen		; devtbl serial device table
idevlen	equ	16*8			; primary table

idevshd	equ	idevtbl+idevlen		; devtbl serial device
ishdlen	equ	16*4			; sahdow table

idvini	equ	idevshd+ishdlen		;then comes init values
					;first is init re-direction
idvilen	equ	5*2

idvstr	equ	idvini+idvilen		; then init strings
idvslen	equ	16*16			; (total max length)


idelay	equ	idvstr+idvslen		; Device delay variables
idellen	equ	2


iexd	equ	idelay+idellen		; End (or next entry)

;
;
;;	-30-	excbiose.lib