JMP	IOINIT		;Skip past initialization table
;
	eject
DS0INI	EQU	offset $
    DSEG 0
	ORG	DS0INI
;********************************************************
;*	INPUT/OUTPUT DEVICE INITIAL SELECT TABLE	*
;********************************************************
BIOTBL	RS 0	;I/O byte (IOBYTE) value, Aux I/O control byte (IOCNTL) value
; Switch = 0
   DB	10000001b	;LST:=LPT:, PUN:=TTY:, RDR:=TTY:, CON:=CRT:
   DB	01000010b	;LPT:=Interfacer I UART 1, CRT:=Interfacer I UART 0
; Switch = 1
   DB	10000001b	;LST:=LPT:, PUN:=TTY:, RDR:=TTY:, CON:=CRT:
   DB	00000100b	;LPT:=Interfacer 3 USER 4 xon/xoff, CRT:=USER 0
; Switch = 2
   DB	10000001b	;LST:=LPT:, PUN:=TTY:, RDR:=TTY:, CON:=CRT:
   DB	00000101b	;LPT:=Interfacer 3,4 USER 4, CRT:=System Support I
; Switch = 3
   DB	00000011b	;LST:=TTY:, PUN:=TTY:, RDR:=TTY:, CON:=UC1:
   DB	00000101b	;LPT:=Interfacer 3,4 USER 4, CRT:=System Support I
;
; IOBYTE value is the first entry for each switch selection, and --
; IOCNTL =	ww$xx$yy$zzb	selects the following:
;(second byte	ww xx yy 00	CRT:=Interfacer 3 USER 0.
;of each entry	ww xx yy 01	CRT:=System Support I.
;in BIOTBL).	ww xx yy 10	CRT:=Interfacer 1,2 UART 0.
;		   xx yy 11	CRT:=Interfacer 1,2 UART 1 (Custom Routine).
;		00 xx yy --	LPT:=Interfacer 3,4 USER 4.
;		01 xx yy --	LPT:=Interfacer 1,2 UART 1.
;		10 xx yy --	LPT:=Interfacer 1,2 UART 2 (Custom Routine).
;		11 xx yy --	LPT:=	"	"	"	"	"
;		-- xx -- --	Interfacer 3,4 USER 5 list routine select,
;		-- -- yy --	Interfacer 3,4 USER 4 list routine select,
;Where xx and/or yy = 00	Straight output, no software protocol.
;		      01	XON/XOFF software protocol active.
;		      10	ETX/ACK software protocol active.
; And (always):	UC1:= Interfacer 3,4 USER 7
;		TTY:= Interfacer 3,4 USER 6
;		UL1:= Interfacer 3,4 USER 5 at all times.
;<=========  If CON:=BAT: then --
;/==|	BAT:=	RDR:= Interfacer 3,4 USER 3 when RDR:=UR2: on input.
;\==|__	BAT:=	PUN:=	"		" 3 when PUN:=UP2: on output.
;/==|	BAT:=	RDR:= Interfacer 3,4 USER 2 when RDR:=UR1: on input.
;\==|__	BAT:=	PUN:=	"		" 2 when PUN:=UP2: on output.
;/==|	BAT:=	RDR:= Interfacer 3,4 USER 1 when RDR:=PTR: on input.
;\==|__	BAT:=	PUN:=	"		" 1 when PUN:=PTP: on output.
;x /--|	BAT:=	----- Interfacer 3,4 USER 0 when RDR:=TTY: on input.
;x \--|	BAT:=	-----	"		" 0 when PUN:=TTY: on output.
; and for reader/punch vectors only --
;x --	------	RDR:= Interfacer 3,4 USER 6 when RDR:=TTY: on input.
;x --	------	PUN:=	"		" 6 when PUN:=TTY: on output.
	eject
;************************************************************************
;* INTERRUPT CONTROLLER AND RELATED INPUT/OUTPUT DEVICE INITIALIZATION	*
;************************************************************************
INISEQ	RS 0	;Port,	Value to transmit sequence until Port = 0FFh.
;
    if FALSE
      if INTERFACER3
   DB	IF3UX,	0	;Select Uart 0
   DB	IF3UM,01011010b ;Async, 16x, 7 bits, odd parity, 1 stop
   DB	IF3UM,01111110b ; 9600 baud
   DB	IF3UC,00100111b	;Trans. on, DTR low, rec. on, no break/ reset, RTS low
;
   DB	IF3UX,	1	;Select Uart 1
   DB	IF3UM,01011010b ;Async, 16x, 7 bits, odd parity, 1 stop
   DB	IF3UM,01111110b ; 9600 baud
   DB	IF3UC,00100111b	;Trans. on, DTR low, rec. on, no break/ reset, RTS low
;
   DB	IF3UX,	2	;Select Uart 2
   DB	IF3UM,01011010b ;Async, 16x, 7 bits, odd parity, 1 stop
   DB	IF3UM,01111110b ;9600 baud
   DB	IF3UC,00100111b	;Trans. on, DTR low, rec. on, no break/ reset, RTS low
;
   DB	IF3UX,	3	;Select Uart 3
   DB	IF3UM,01011010b ;Async, 16x, 7 bits, odd parity, 1 stop
   DB	IF3UM,01111110b ; 9600 baud
   DB	IF3UC,00100111b	;Trans. on, DTR low, rec. on, no break/ reset, RTS low
;
   DB	IF3IR,00000000b	;Interrupt on data received control port (disabled)
   DB	IF3IT,00000000b	;Interrupt on xmit ready control port (disabled)
      endif
      if INTERFACER3 or INTERFACER4
   DB	IF3UX,	4	;Select Uart 4
   DB	IF3UM,01011010b ;Async, 16x, 7 bits, Odd parity, 1 stop
   DB	IF3UM,01111110b ; 9600 baud
   DB	IF3UC,00100111b	;Trans. on, DTR low, rec. on, no break/ reset, RTS low
;
   DB	IF3UX,	5	;Select Uart 5
   DB	IF3UM,01011010b ;Async, 16x, 7 bits, odd parity, 1 stop
   DB	IF3UM,01111110b ; 9600 baud
   DB	IF3UC,00100111b	;Trans. on, DTR low, rec. on, no break/ reset, RTS low
;
   DB	IF3UX,	6	;Select Uart 6
   DB	IF3UM,01101110b ;Async, 16x, 8 bits,  no parity, 1 stop
   DB	IF3UM,01110111b ; 1200 baud
   DB	IF3UC,00100111b	;Trans. on, DTR low, rec. on, no break/ reset, RTS low
;
   DB	IF3UX,	7	;Select Uart 7
   DB	IF3UM,01011010b ;Async, 16x, 7 bits, odd parity, 1 stop
   DB	IF3UM,01111110b ; 9600 baud
   DB	IF3UC,00100111b	;Trans. on, DTR low, rec. on, no break/ reset, RTS low
      endif
      if (INTERFACER3 and INTERFACER4)
   DB	IF3UX,	8	;Select Uart 4
   DB	IF3UM,01011010b ;Async, 16x, 7 bits, odd parity, 1 stop
   DB	IF3UM,01111110b ; 9600 baud
   DB	IF3UC,00100111b	;Trans. on, DTR low, rec. on, no break/ reset, RTS low
;
   DB	IF3UX,	9	;Select Uart 5
   DB	IF3UM,01111111b ;Async, 16x, 8 bits, even parity, 2 stop
   DB	IF3UM,01110101b ;  300 baud
   DB	IF3UC,00100111b	;Trans. on, DTR low, rec. on, no break/ reset, RTS low
;
   DB	IF3UX,	10	;Select Uart 6
   DB	IF3UM,01011110b ;Async, 16x, 8 bits, odd parity, 1 stop
   DB	IF3UM,01111110b ; 9600 baud
   DB	IF3UC,00100111b	;Trans. on, DTR low, rec. on, no break/ reset, RTS low
;
   DB	IF3UX,	11	;Select Uart 7
   DB	IF3UM,01011110b ;Async, 16x, 8 bits, odd parity, 1 stop
   DB	IF3UM,01111110b ; 9600 baud
   DB	IF3UC,00100111b	;Trans. on, DTR low, rec. on, no break/ reset, RTS low
;
   DB	IF3IR,00000000b	;Interrupt on data received control port (disabled)
   DB	IF3IT,00000000b	;Interrupt on xmit ready control port (disabled)
      endif
;
; System Support I UART initialization.
      if SYSUP1
   DB	SS1UM,01011010b	;Async, 16x, 7 bits, Odd parity, 1 stop
   DB	SS1UM,01111111b	;19200 baud
   DB	SS1UC,00100111b	;Xmit on, DTR low, rec. on, no break, run, RTS low
;
; System Support I timer initialization.
   DB	SS1TC,00110110b		;Timer 0, 16 bit load, square wave, binary
   DB	SS1T0,TIMEBASE and 0FFh	;Get divisor for time base for other 2 timers
   DB	SS1T0,TIMEBASE shr 8	;Set up timer 0
;
   DB	SS1TC,01110000b		;Timer 1, 16 bit, interrupt on count, binary
   DB	SS1T1,TIME1 and 0FFh	;Get divisor for time base for other 2 timers
   DB	SS1T1,TIME1 shr 8	;Set up timer 1 (Real Time Clock tick)
;
   DB	SS1TC,10110000b		;Timer 2, 16 bit, interrupt on count, binary
   DB	SS1T2,TIME2 and 0FFh	;Set interrupt interval in units of time base
   DB	SS1T2,TIME2 shr 8
      endif
    endif
;
; Initialize Slave 8259A Interrupt Controller.
   DB	SS1SP0,00011101b	;Level trig, 4X interval, cascade, ICW4 -- ICW1
   DB	SS1SP1,INTBASE + 8	;Base Number of Slave interrupts	-- ICW2
   DB	SS1SP1,00000111b	;Slave ID is interrupt 7		-- ICW3
   DB	SS1SP1,00000001b	;Non-buffered, normal EOI, 8086		-- ICW4
   DB	SS1SP1,SMASK		;Slave PIC initial Active Interrupt Mask - OCW1
   DB	SS1SP0,EOI		;Clear controller of pending interrupts	-- OCW2
   DB	SS1SP0,SETPRI+6		;Set CRT transmit to lowest priority	-- OCW2
   DB	SS1SP0,READISR		;Set to read interrupt service register	-- OCW3
   DB	SS1SP0,SMMOFF		;Special mask mode off			-- OCW3
;
; Initialize Master 8259A Interrupt Controller.
   DB	SS1MP0,00011101b	;Level trig, 4X interval, cascade, ICW4 -- ICW1
   DB	SS1MP1,INTBASE		;Base Address of Master interrupts	-- ICW2
   DB	SS1MP1,10000000b	;Only interrupt 7 is a slave		-- ICW3
   DB	SS1MP1,00010001b	;Full nest, non-buffered, norm EOI, 8086 - ICW4
   DB	SS1MP1,MMASK		;Master initial Active Interrupt Mask	-- OCW1
   DB	SS1MP0,EOI		;Clear controller of pending interrupts	-- OCW2
   DB	SS1MP0,READISR		;Set to read interrupt service register	-- OCW3
   DB	SS1MP0,SMMOFF		;Special mask mode off			-- OCW3
;      endif
   DB	0FFh	;End of I/O port initialization string
;      if I8086
MSTRMASK EQU  11111111b	;Use masks that place controller in benign state
;
; Initialize 80130 Interrupt Controller.
   DB	I86MP0,00111001b	;ICW6, Level trig, 4X interval,
   DB	I86MP1,INTBASE * 8	;Base Address of Slave interrupts	-- ICW2
   DB	I86MP1,11111111b	;All IRs are slaves		        -- ICW3
   DB	I86MP1,00011101b	;Special Fully nested, norm EOI, 8086	-- ICW4
   DB	I86MP1,00000000b	;All IRs are non-local	                -- ICW6
   DB	I86MP1,MSTRMASK		;Mask off all IRs                       -- OCW1
;
   DB	0FFh	;End of I/O port initialization string
;
	eject
;****************************************************************
;*	INTERRUPT VECTOR TABLE FOR RELOCATION TO LOW MEMORY	*
;****************************************************************
;    Master PIC interrupt vectors:
INTVEC	DW  offset ITRAP	;VI0 --
	DW  offset ITRAP	;VI1 -- Disk 2, Disk 3 service request
	DW  offset ITRAP	;VI2 -- Interfacer 1-4 transmit request
	DW  offset ITRAP	;VI3 -- Interfacer 1-4 receive request
	DW  offset ITRAP	;VI4 -- Disk 1 (Disk 1A) service request
	DW  offset ITRAP	;VI5 --
	DW  offset ITRAP	;VI6 --
	DW  offset ITRAP	;Slave interrupt (inactive vector)
;    Slave  PIC interrupt vectors:
	DW  offset ITRAP	;VI7 --
	DW  offset ITRAP	;Timer #0
	DW  offset ITRAP	;Timer #1
	DW  offset ITRAP	;Timer #2
	DW  offset ITRAP	;Math chip service request
	DW  offset ITRAP	;Math chip end of process
	DW  offset CRTXMIT	;System Support I UART transmit data request
	DW  offset CRTRCVR	;System Support I UART receive data request
;
INTRRAM	DW  (INTBASE * 4),0000h	;Base address of interrupt vectors to load
;
CS0INI	EQU	offset $
    CSEG 0
	ORG	CS0INI
;****************************************************************
;*	INPUT/OUTPUT DEVICE INITIALIZATION SEQUENCE ROUTINE	*
;****************************************************************
;
IOINIT0:MOV	AL,1[BX]	;Get corresponding data byte to xmit
	OUT	DX,AL		;Send data to specified port
	ADD	BX,2		;Point to next pair to xmit
IOINIT1:MOV	DL,[BX]		;Get output port to use for this data byte
	CMP	DL,0FFh		;See if final port of sequence
	JNZ	IOINIT0		;Send next data byte to I/O port if not
	RET
;
IOINIT:	MOV	CX,16		;Sixteen interrupt vectors to initialize
	PUSH	ES		;Save the current extra segment
	LES  DI,Dword ptr INTRRAM ;Set destination index at base of interrupts
	MOV  SI,offset INTVEC	;Point to table of vectors to relocate
IOINIT2:MOVSW			;Put table vector into corresponding interrupt
	ADD	DI,2		;Point to next interrupt vector offset location
	LOOP	IOINIT2		;Loop until all 16 vectors relocated
	POP	ES		;Restore the extra segment

	MOV	DH,0		;Clear the high byte of the I/O port to use
	LEA	BX,INISEQ	;Point to the initialization sequence table
	CALL	IOINIT1		;Transmit port, data byte pairs of entire table
;      if I8086	;Lets always turn off 80130
	INC	BX		;Move past first end of table marker
	MOV	DH,0FFh		;Set the high byte of the I/O port for 80130
	CALL	IOINIT1		;Transmit port, data byte pairs of entire table
;      endif
	MOV  Word Ptr DATASEG,DS ;Set current data segment as data seg for interrupts 
	STI			;And enable interrupts