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Tandy 1000 Programmer's Reference Guide

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Chapter
6
I
BIOS
Services
Line Printer
These routines provide an interface
to
the parallel line printer.
This device is labeled “PRN’ in the device list maintained by the
operating system.
Software Interrupts:
17
hex
(23
dec)
Function Summary:
AH
=
0:
Print Character
AH
=
1:
Reset Printer Port
AH
=
2:
Get Current Printer Status
Function Descriptions:
Print Character
Print a character.
Entry Conditions:
AH
=
0
AL
=
character to print
DX
=
printer to be used (0-2)
Exit Conditions:
OAH
=
printer status; see Get Current Printer Status
(AH
=
2)
below
(If
bit
0
is set, the character could not be printed be-
cause
of
a timeout error.)
Reset Printer Port
Reset (or initialize) the printer port.
Entry Conditions:
AH
=
1
DX
=
printer to be used
(0-2)
Exit Conditions:
AH
=
printer status/ see Get Current Printer Status
(AH
=
2)
below
207

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Tandy 1000 Specifications

General IconGeneral
ProcessorIntel 8088
Processor Speed4.77 MHz
RAM128 KB (expandable to 640 KB)
Operating SystemMS-DOS 2.11
ManufacturerTandy Corporation
Release Year1984
StorageSingle or double 5.25" floppy disk drive (360 KB), optional hard drive
SoundTandy 3-voice sound
PortsParallel, Serial
GraphicsCGA (Color Graphics Adapter)
Graphics Modes320x200, 640x200

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