;I/O port definitions

;DMA controller (i8237-2) ports
DMAC_BADD0	EQU	00H	;Channel 0 - base & current address (write)
DMAC_CADD0	EQU	00H	;   "    " - current address (read)
DMAC_BCNT0	EQU	01H	;   "    " - base & current word count (write)
DMAC_CCNT0	EQU	01H	;   "    " - curent word count (read)
DMAC_BADD1	EQU	02H	;Channel 1 - base & current address (write)
DMAC_CADD1	EQU	02H	;   "    " - current address (read)
DMAC_BCNT1	EQU	03H	;   "    " - base & current word count (write)
DMAC_CCNT1	EQU	03H	;   "    " - curent word count (read)
DMAC_BADD2	EQU	04H	;Channel 2 - base & current address (write)
DMAC_CADD2	EQU	04H	;   "    " - current address (read)
DMAC_BCNT2	EQU	05H	;   "    " - base & current word count (write)
DMAC_CCNT2	EQU	05H	;   "    " - curent word count (read)
DMAC_BADD3	EQU	06H	;Channel 3 - base & current address (write)
DMAC_CADD3	EQU	06H	;   "    " - current address (read)
DMAC_BCNT3	EQU	07H	;   "    " - base & current word count (write)
DMAC_CCNT3	EQU	07H	;   "    " - curent word count (read)
DMAC_STAT	EQU	08H	;Status register (read)
DMAC_CMD	EQU	08H	;Command register (write)
DMAC_REQ	EQU	09H	;Request register (write)
DMAC_MASK_SR	EQU	0AH	;Single mask register bit (write)
DMAC_MODE	EQU	0BH	;Mode register (write)
DMAC_FLOP	EQU	0CH	;Clear byte pointer flip/flop (write)
DMAC_TEMP	EQU	0DH	;Temporary register (read)
DMAC_CLR	EQU	0DH	;Master clear (write)
DMAC_MASK	EQU	0FH	;All mask register bits (write)

;Programmable interrupt controller (i8259A) ports
PIC_STAT	EQU	010H	;Interrupt request/serviced status
PIC_ICW		EQU	010H	;Initialization control words
PIC_IMR		EQU	011H	;Interrupt level masks
PIC_OCW		EQU	011H	;Operational control words

;DIP switch and diagnostic LED display
DIP_SW		EQU	020H	;DIP switch
LED_DSPY	EQU	020H	;LED display	

;Bank select registers
DMAC_BANK	EQU	30H	;general - before separate ones used
FDC_BANK	EQU	31H	;Floppy bank
REFRESH_BANK	EQU	30H	;Refresh bank
SIO_BANK	EQU	32H	;SIO bank - for networking
WINCH_BANK	EQU	33H	;Winchester bank
Z80_BANK	EQU	30H	;Z80 bank

;CRT controller
CRT_ADDR	EQU	040H	;Address/status register
CRT_STAT	EQU	040H
CRT_DATA	EQU	041H	;Register file
CRT_CHAR	EQU	020H	;Character latch

;Floppy disk controller ports
AUX_CMD		EQU	050H	;Floppy disk select/handshake
FDC_CMD		EQU	060H	;Command port
FDC_STAT	EQU	060H	;Status register
FDC_TRK		EQU	061H	;Track register
FDC_SEC		EQU	062H	;Sector register
FDC_DATA	EQU	063H	;Data register

;Keyboard
KYBD_DATA	EQU	051H	;Keyboard data
KYBD_STAT	EQU	052H	;Keyboard Status
KYBD_CNTL	EQU	053H	;Mode control 8255
BUZZER		EQU	050H	;Buzzer

;Hard disk registers
ADP_STAT	EQU	071H
ADP_CMD		EQU	071H
ADP_DIAG	EQU	072H
ADP_DATA	EQU	073H

;Programmable interval timer (i8253) ports
PIT0_CT0	EQU	080H	;PIT 0, counter 0
PIT0_CT1	EQU	081H	; "  0,    "    1
PIT0_CT2	EQU	082H	; "  0,    "    2
PIT0_CTL	EQU	083H	; "  0, control
PIT1_CT0	EQU	090H	; "  1, counter 0
PIT1_CT1	EQU	091H	; "  1,    "    1
PIT1_CT2	EQU	092H	; "  1,    "    2
PIT1_CTL	EQU	093H	; "  1, control

;Serial input/output (Z80-SIO) ports
SIO0A_DATA	EQU	0A0H	;SIO 0, channel A, data
SIO0A_STAT	EQU	0A1H	; "  0,    "    A, status
SIO0A_CNTL	EQU	0A1H	; "  0,    "    A, control
SIO0B_DATA	EQU	0A2H	;SIO 0, channel B, data
SIO0B_STAT	EQU	0A3H	; "  0,    "    B, status
SIO0B_CNTL	EQU	0A3H	; "  0,    "    B, control
SIO1A_DATA	EQU	0B0H	;SIO 1, channel A, data
SIO1A_STAT	EQU	0B1H	; "  1,    "    A, status
SIO1A_CNTL	EQU	0B1H	; "  1,    "    A, control
SIO1B_DATA	EQU	0B2H	;SIO 1, channel B, data
SIO1B_STAT	EQU	0B3H	; "  1,    "    B, status
SIO1B_CNTL	EQU	0B3H	; "  1,    "    B, control

SIO_INT_VEC	EQU	0E0H	;Interrupt vector - SIO or DART

;Centronics compatible parallel printer ports
PTR_DATA	EQU	0F0H	;Printer data out
PTR_STAT	EQU	0F1H	;   "    status
PTR_CNTL	EQU	0F2H	;   "    control
PTR_MODE	EQU	0F3H	;   "    port mode control
PTR_FLAG	EQU	PTR_MODE

;LED display constants
led_0		equ	0c0h
led_1		equ	0f9h
led_2		equ	0a4h
led_3		equ	0b0h
led_4		equ	099h
led_5		equ	092h
led_6		equ	082h
led_7		equ	0f8h
led_8		equ	080h
led_9		equ	098h

led_0p		equ	040h
led_1p		equ	079h
led_2p		equ	024h
led_3p		equ	030h
led_4p		equ	019h
led_5p		equ	012h
led_6p		equ	002h
led_7p		equ	078h
led_8p		equ	000h
led_9p		equ	018h

;Others
LINE_LENGTH	EQU	80	;Length of CRT character line
CR		EQU	13
LF		EQU	10
BS		EQU	08
ESC		EQU	1BH
NULL		EQU	0
BELL		EQU	7
INT3		EQU	0CCH
CNTL_X		EQU	'X'-'A'+1
CNTL_Q		EQU	'Q'-'A'+1
CNTL_Z		EQU	'Z'-'A'+1
CNTL_S		EQU	'S'-'A'+1
TRUE		EQU	-1
FALSE		EQU	0

RD_CMD		EQU	20H		;Read command for FLOPALL
WR_CMD		EQU	50H		;Write with verify

BIT0		EQU	00000001B
BIT1		EQU	00000010B
BIT2		EQU	00000100B
BIT3		EQU	00001000B
BIT4		EQU	00010000B
BIT5		EQU	00100000B
BIT6		EQU	01000000B
BIT7		EQU	10000000B

;Equivalent to JNZ $+3 ; RET

CodeMacro RZ
  DB  75H
  DB  01H
  DB 0C3H
EndM

;Equivalent to JZ $+3 ; RET

CodeMacro RNZ
  DB  74H
  DB  01H
  DB 0C3H
EndM

RE		EQU	RZ
RNE		EQU	RNZ
JC		EQU	JB
JNC		EQU	JNB
JNBE		EQU	JA