Tandy 1000 Programmer's Reference Guide

Chapter 6 I BIOS Services
Video Display
These routines provide an interface to the video display, which is
the output
half of the console (CON) device. MS-DOS considers
the video display
to be the default standard output (STDOUT)
device.
Software Interrupts:
10 hex (16 dec)
Function Summary:
Control Routines:
AH
= 0: Set CRT Mode
AH
= 1: Set Cursor Type
AH
= 2: Set Cursor Position
AH
= 3: Get Cursor Position
AH
= 4: Read Light Pen Position
AH
= 5: Select Active Page
AH = 6: Scroll Up
AH = 7: Scroll Down
AH
= 8: Read AttributeKharacter
AH
= 9: Write AttributeICharacter
AH
= 10: Write Character Only'
AH
= 11: Set Color Palette
AH
= 12: Write Dot
AH
= 13: Read Dot
Other Routines:
AH
= 14: Write TTY'"
AH
= 15: Get CRT Mode
AH
= 16: Set Palette Registers
Text Routines:
Graphics Routines:
"Screen width
is determined by the mode previously set. Some
"control" characters (ASCII 00H-1FH) perform the usual spe-
cial terminal function. These include (but are not limited
to)
BEL (07H), BS (08H), LF (0AH), and CR (0DH).
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Tandy 1000 Specifications

General

Processor	Intel 8088
Processor Speed	4.77 MHz
RAM	128 KB (expandable to 640 KB)
Operating System	MS-DOS 2.11
Manufacturer	Tandy Corporation
Release Year	1984
Storage	Single or double 5.25" floppy disk drive (360 KB), optional hard drive
Sound	Tandy 3-voice sound
Ports	Parallel, Serial
Graphics	CGA (Color Graphics Adapter)
Graphics Modes	320x200, 640x200