;**************************************************************************
;
; Filename : ACIA_TTY.D
; ---------------------
;
; (c) 1990 by Thomas Lehmann
;
;
; Jackophone V5.00
;
;
; Definition der ACIA bzw. Protokoll
;
;
;**************************************************************************



	; ==========================
	; ACIA 6551 Register Offsets
	; ==========================

ACIA_TXD	equ	0	; write, Transmit Data
ACIA_RXD	equ	0	; read, received Data
ACIA_RES	equ	1	; write, Reset
ACIA_STS	equ	1	; read, Status Register
ACIA_CMD	equ	2	; write/read, Command Register
ACIA_CTRL	equ	3	; write/read, Control Register


	; ACIA Status Register, Interrupt Quellen
	; ---------------------------------------

STS_PARITY	equ	%00000001	; Parity Error
STS_FRAMING	equ	%00000010	; Framing Error
STS_OVERRUN	equ	%00000100	; Overrun Error
STS_RXD	equ	%00001000	; Receiver Data Register full
STS_TXD	equ	%00010000	; Transmitter Data Register empty
STS_DCD	equ	%00100000	; Data Carrier Detect
STS_DSR	equ	%01000000	; Data Set Ready
STS_IRQ	equ	%10000000	; ACIA IRQ


STS_ERRMSK	equ STS_PARITY|STS_FRAMING|STS_OVERRUN


	; ACIA Control Register
	; ---------------------

CTRL_SBR0	equ	%00000001	; Select Baud Rate
CTRL_SBR1	equ	%00000010
CTRL_SBR2	equ	%00000100
CTRL_SBR3	equ	%00001000
CTRL_RCS	equ	%00010000	; Receiver Clock Source
CTRL_WL0	equ	%00100000	; Word Length
CTRL_WL1	equ	%01000000
CTRL_SBN	equ	%10000000	; Stop BIT Number


	; ACIA Command Register
	; ---------------------

CMD_DTR	equ	%00000001	Data Terminal Ready, enable IRQ`s
CMD_IRD	equ	%00000010	Disable receiver IRQ
CMD_TIC0	equ	%00000100	Transmitter IRQ Control
CMD_TIC1	equ	%00001000
CMD_REM	equ	%00010000	Receiver Echo Mode
CMD_PME	equ	%00100000	Parity Mode Enable
CMD_PMC0	equ	%01000000	Parity Mode Control
CMD_PMC1	equ	%10000000



	; Baud Raten
	; ----------
BAUD_50	equ CTRL_SBR0
BAUD_150	equ CTRL_SBR0|CTRL_SBR2
BAUD_300	equ CTRL_SBR1|CTRL_SBR2
BAUD_600	equ CTRL_SBR0|CTRL_SBR1|CTRL_SBR2
BAUD_1200	equ CTRL_SBR3
BAUD_2400	equ CTRL_SBR1|CTRL_SBR3
BAUD_4800	equ CTRL_SBR2|CTRL_SBR3
BAUD_9600	equ CTRL_SBR1|CTRL_SBR2|CTRL_SBR3
BAUD_19200	equ CTRL_SBR0|CTRL_SBR1|CTRL_SBR2|CTRL_SBR3

BAUD	equ BAUD_2400	; <<-- ist das höchste der Gefühle für RXD




	; =====================
	; Character für Console
	; =====================
CR	equ $0d		Code für Carrige Return
LF	equ $0a		Code für Line Feed



	; ====================
	; Protokoll Definition
	; ====================
STX	equ	$f0	Start bzw. Sync-Zeichen
ETX	equ	$f1	Ende Zeichen
XON	equ	$f2	Übertragungs Freigabe
XOFF	equ	$f3	Übertragungs Stop
ESC	equ	$f4	Sonderzeichen folgt
ACK	equ	$f5	positive Quittung
NACK	equ	$f6	negative Quittung