IFND	HARDWARE_CIA_I
HARDWARE_CIA_I	SET	1
**
**	$Filename: hardware/cia.i $
**	$Release: 1.3 $
**
**	registers and bits in the Complex Interface Adapter (CIA) chip 
**
**	(C) Copyright 1985,1986,1987,1988 Commodore-Amiga, Inc.
**	    All Rights Reserved
**

*
* _ciaa is on an ODD address (e.g. the low byte) -- $bfe001
* _ciab is on an EVEN address (e.g. the high byte) -- $bfd000
*
* do this to get the definitions:
*    XREF _ciaa
*    XREF _ciab
*


* cia register offsets
ciapra		  EQU	$0000
ciaprb		  EQU	$0100
ciaddra		  EQU	$0200
ciaddrb		  EQU	$0300
ciatalo		  EQU	$0400
ciatahi		  EQU	$0500
ciatblo		  EQU	$0600
ciatbhi		  EQU	$0700
ciatodlow	  EQU	$0800
ciatodmid	  EQU	$0900
ciatodhi	  EQU	$0A00
ciasdr		  EQU	$0C00
ciaicr		  EQU	$0D00
ciacra		  EQU	$0E00
ciacrb		  EQU	$0F00

* interrupt control register bit numbers
CIAICRB_TA	  EQU	0
CIAICRB_TB	  EQU	1
CIAICRB_ALRM	  EQU	2
CIAICRB_SP	  EQU	3
CIAICRB_FLG	  EQU	4
CIAICRB_IR	  EQU	7
CIAICRB_SETCLR	  EQU	7

* control register A bit numbers
CIACRAB_START	  EQU	0
CIACRAB_PBON	  EQU	1
CIACRAB_OUTMODE	  EQU	2
CIACRAB_RUNMODE	  EQU	3
CIACRAB_LOAD	  EQU	4
CIACRAB_INMODE	  EQU	5
CIACRAB_SPMODE	  EQU	6
CIACRAB_TODIN	  EQU	7

* control register B bit numbers
CIACRBB_START	  EQU	0
CIACRBB_PBON	  EQU	1
CIACRBB_OUTMODE	  EQU	2
CIACRBB_RUNMODE	  EQU	3
CIACRBB_LOAD	  EQU	4
CIACRBB_INMODE0	  EQU	5
CIACRBB_INMODE1	  EQU	6
CIACRBB_ALARM	  EQU	7
 
* interrupt control register bit masks
CIAICRF_TA	  EQU	(1<<0)
CIAICRF_TB	  EQU	(1<<1)
CIAICRF_ALRM	  EQU	(1<<2)
CIAICRF_SP	  EQU	(1<<3)
CIAICRF_FLG	  EQU	(1<<4)
CIAICRF_IR	  EQU	(1<<7)
CIAICRF_SETCLR	  EQU	(1<<7)

* control register A bit masks
CIACRAF_START	  EQU	(1<<0)
CIACRAF_PBON	  EQU	(1<<1)
CIACRAF_OUTMODE	  EQU	(1<<2)
CIACRAF_RUNMODE	  EQU	(1<<3)
CIACRAF_LOAD	  EQU	(1<<4)
CIACRAF_INMODE	  EQU	(1<<5)
CIACRAF_SPMODE	  EQU	(1<<6)
CIACRAF_TODIN	  EQU	(1<<7)

* control register B bit masks
CIACRBF_START	  EQU	(1<<0)
CIACRBF_PBON	  EQU	(1<<1)
CIACRBF_OUTMODE	  EQU	(1<<2)
CIACRBF_RUNMODE	  EQU	(1<<3)
CIACRBF_LOAD	  EQU	(1<<4)
CIACRBF_INMODE0	  EQU	(1<<5)
CIACRBF_INMODE1	  EQU	(1<<6)
CIACRBF_ALARM	  EQU	(1<<7)
 
* control register B INMODE masks
CIACRBF_IN_PHI2	  EQU	0
CIACRBF_IN_CNT	  EQU	(CIACRBF_INMODE0)
CIACRBF_IN_TA	  EQU	(CIACRBF_INMODE1)
CIACRBF_IN_CNT_TA EQU	(CIACRBF_INMODE0!CIACRBF_INMODE1)


*
* Port definitions -- what each bit in a cia peripheral register is tied to
*

* ciaa port A (0xbfe001)
CIAB_GAMEPORT1	  EQU	(7)   * gameport 1, pin 6 (fire button*)
CIAB_GAMEPORT0	  EQU	(6)   * gameport 0, pin 6 (fire button*)
CIAB_DSKRDY	  EQU	(5)   * disk ready*
CIAB_DSKTRACK0	  EQU	(4)   * disk on track 00*
CIAB_DSKPROT	  EQU	(3)   * disk write protect*
CIAB_DSKCHANGE	  EQU	(2)   * disk change*
CIAB_LED	  EQU	(1)   * led light control (0==>bright)
CIAB_OVERLAY	  EQU	(0)   * memory overlay bit

* ciaa port B (0xbfe101) -- parallel port

* ciab port A (0xbfd000) -- serial and printer control
CIAB_COMDTR	  EQU	(7)   * serial Data Terminal Ready*
CIAB_COMRTS	  EQU	(6)   * serial Request to Send*
CIAB_COMCD	  EQU	(5)   * serial Carrier Detect*
CIAB_COMCTS	  EQU	(4)   * serial Clear to Send*
CIAB_COMDSR	  EQU	(3)   * serial Data Set Ready*
CIAB_PRTRSEL	  EQU	(2)   * printer SELECT
CIAB_PRTRPOUT	  EQU	(1)   * printer paper out
CIAB_PRTRBUSY	  EQU	(0)   * printer busy

* ciab port B (0xbfd100) -- disk control
CIAB_DSKMOTOR	  EQU	(7)   * disk motorr*
CIAB_DSKSEL3	  EQU	(6)   * disk select unit 3*
CIAB_DSKSEL2	  EQU	(5)   * disk select unit 2*
CIAB_DSKSEL1	  EQU	(4)   * disk select unit 1*
CIAB_DSKSEL0	  EQU	(3)   * disk select unit 0*
CIAB_DSKSIDE	  EQU	(2)   * disk side select*
CIAB_DSKDIREC	  EQU	(1)   * disk direction of seek*
CIAB_DSKSTEP	  EQU	(0)   * disk step heads*

* ciaa port A (0xbfe001)
CIAF_GAMEPORT1	  EQU	(1<<7)
CIAF_GAMEPORT0	  EQU	(1<<6)
CIAF_DSKRDY	  EQU	(1<<5)
CIAF_DSKTRACK0	  EQU	(1<<4)
CIAF_DSKPROT	  EQU	(1<<3)
CIAF_DSKCHANGE	  EQU	(1<<2)
CIAF_LED	  EQU	(1<<1)
CIAF_OVERLAY	  EQU	(1<<0)

* ciaa port B (0xbfe101) -- parallel port

* ciab port A (0xbfd000) -- serial and printer control
CIAF_COMDTR	  EQU	(1<<7)
CIAF_COMRTS	  EQU	(1<<6)
CIAF_COMCD	  EQU	(1<<5)
CIAF_COMCTS	  EQU	(1<<4)
CIAF_COMDSR	  EQU	(1<<3)
CIAF_PRTRSEL	  EQU	(1<<2)
CIAF_PRTRPOUT	  EQU	(1<<1)
CIAF_PRTRBUSY	  EQU	(1<<0)

* ciab port B (0xbfd100) -- disk control
CIAF_DSKMOTOR	  EQU	(1<<7)
CIAF_DSKSEL3	  EQU	(1<<6)
CIAF_DSKSEL2	  EQU	(1<<5)
CIAF_DSKSEL1	  EQU	(1<<4)
CIAF_DSKSEL0	  EQU	(1<<3)
CIAF_DSKSIDE	  EQU	(1<<2)
CIAF_DSKDIREC	  EQU	(1<<1)
CIAF_DSKSTEP	  EQU	(1<<0)

	ENDC	; HARDWARE_CIA_I