;**	6821 PERIPHERAL INTERFACE ADAPTER 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

;	REGISTER DISPLACEMENTS

PIADATA	EQU	0			;PERIPHERAL DATA REGISTER A
PIADDRA	EQU	0			;DATA DIRECTION REGISTER A
PIACTLA	EQU	1			;CONTROL REGISTER A
PIADATB	EQU	2			;PERIPHERAL DATA REGISTER B
PIADDRB	EQU	2			;DATA DIRECTION REGISTER B
PIACTLB	EQU	3			;CONTROL REGISTER B

;	CONTROL WORD FORMAT

PIAC1	EQU	00000011B	;CONTROL OF CA1(CB1) INTERRUPT LINE
PIAC10	EQU	00H		; ACTIVE TRANSITION 1->0
				;  IRQ PIN IS DISABLED
PIAC11	EQU	01H		; ACTIVE TRANSITION 1->0
				;  IRQ PIN IS ENABLED
PIAC12	EQU	02H		; ACTIVE TRANSITION 0->1
				;  IRQ PIN IS DISABLED
PIAC13	EQU	03H		; ACTIVE TRANSITION 0->1
				;  IRQ PIN IS ENABLED

PIADDAC	EQU	00000100B	;DATA DIRECTION ACCESS CONTROL BIT
				; 0=DATA DIRECTION REG , 1=PERIPHERAL DATA REG

PIAC2	EQU	00111000B	;CONTROL OF CA2(CB2)
				; INPUT MODES
PIAC20	EQU	00H		;  ACTIVE TRANSITION 1->0
				;   IRQ PIN IS DISABLED
PIAC21	EQU	08H		;  ACTIVE TRANSITION 1->0
				;   IRQ PIN IS ENABLED
PIAC22	EQU	10H		;  ACTIVE TRANSITION 0->1
				;   IRQ PIN IS DISABLED
PIAC23	EQU	18H		;  ACTIVE TRANSITION 0->1
				;   IRQ PIN IS ENABLED
				; OUTPUT MODES
PIAC24	EQU	20H		;  0 ON R(W) OPERATION , 1 ON ACTIVE CA1(CB1)
PIAC25	EQU	28H		;  0 ON R(W) OPERATION , 1 ON E AFTER DESELECT
PIAC26	EQU	30H		;  RESET
PIAC27	EQU	38H		;  SET


PIAIRQ2	EQU	01000000B		;IRQ FOR CA2(CB2)
PIAIRQ1	EQU	10000000B		;IRQ FOR CA1(CB1)