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NAME

	port_handler -- standard serial/parallel/printer port handler.

SYNOPSIS

	Open("PRT:[RAW/TRANSPARENT/UNIT=<Unit number>]",...);
Open("SER:[BAUD=<speed>/CONTROL=<settings>/UNIT=<Unit number>]",...);
Open("PAR:[UNIT=<Unit number>]",...);

FUNCTION

	Port-handler allows AmigaDOS to interface to a standard parallel
device, a standard printer device, and a standard serial device.
Accessing "PAR:" connects AmigaDOS to the system's parallel port.
By default this will use parallel.device, unit 0. To use a
different unit number, such as 1, specify "PAR:UNIT=1" instead.
Accessing "PRT:" connects AmigaDOS to the system's printer. Data
written to PRT: is processed by the Amiga's printer device, handling
conversions of ANSI sequences, and sent to the printer. Accessing
"PRT:RAW" instead causes carriage return translation to be turned
off in the printer device while printing. To send data transparently
to the printer, without any translation or escape sequence substitution
whatsoever, use "PRT:TRANSPARENT". The TRANSPARENT and RAW switches
are mutually exclusive. By default "PRT:" will access printer.device,
unit 0. To use a different unit number, such as 1, specify "PRT:UNIT=1"
instead. The keywords can be combined, such as in "PRT:RAW/UNIT=1".
Accessing "SER:" connects AmigaDOS to the system's default serial port.
Following SER:, the baud rate and some control information can be
supplied. This is done in the form "SER:baud/control" where baud is
a number indicating the baud rate, and where control is a 3 letter
sequence denoting the number of read/write bits, the parity, and the
number of stop bits. For example, "SER:9600/8N1" connects to the
serial port, sets the baud rate to 9600, with 8 bit data, no parity,
and 1 stop bit. The possible control settings are:
1st character: 7 or 8
2nd character: N (No parity), O (Odd parity), E (Even parity)
M (Mark parity), S (Space parity)
3rd character: 1 or 2
Specifying no baud rate or control values when accessing SER: gives you
the values set in Serial preferences.
To override the default unit number, use the UNIT keyword, as with the
PRT: and PAR: devices described above. For example, to access unit 1
with 38400 bps you could use "SER:38400/UNIT=1".
PACKETS
ACTION_FINDINPUT
ACTION_FINDOUTPUT
ACTION_FINDUPDATE
ACTION_READ
ACTION_WRITE
ACTION_END
ACTION_IS_FILESYSTEM
MOUNTLIST ENTRIES
dos.library automatically mounts PAR:, PRT:, and SER: upon
system boot up. The mount entries used by dos.library are equivalent
to:
SER: Handler = L:Port-Handler
Priority = 5
StackSize = 800
GlobVec = 1
Startup = 0
#
PAR: Handler = L:Port-Handler
Priority = 5
StackSize = 800
GlobVec = 1
Startup = 1
#
PRT: Handler = L:Port-Handler
Priority = 5
StackSize = 1000
GlobVec = 1
Startup = 2
#
Starting with V40, you can also provide disk-based mount entries
which let you use port-handler as a serial handler on various devices
and units. The form of these mount entries is:
SER0: EHandler = L:Port-Handler
Priority = 5
StackSize = 800
GlobVec = 1
Device = serial.device
Unit = 0
Flags = 0
Control = "8N1"
Baud = 9600
#
The "Device", "Unit" and "Flags" keywords define the parameters
that the handler uses for OpenDevice(). "Baud" and "Control"
define the default values for baud rate and control information for
whenever that serial handler is accessed by name only, without
explicit baud rate and control information specified.

NOTES

	Prior to V40, the baud rate and control information for SER: were
only recognized if an A2232 multi-serial card was installed in the
system. Starting with V40, these values are always recognized.
The TRANSPARENT, UNIT, BAUD and CONTROL keywords were introduced
with Port-Handler V44. For the different devices, the argument
templates are:
PRT:RAW/S,TRANSPARENT/S,UNIT/K/N
SER:BAUD/N,UNIT/K/N,CONTROL/F
PAR:UNIT/K/N
Instead of blank spaces, keywords must be separated by slashes ("/").

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