Tandy 1000 Programmer's Reference Guide

Chapter 6 i BIOS Services
Exit Conditions:
AL = character read
AH = attribute of character (alpha modes only)
Write Attribute or ColoriCharacter
Write a character and its attribute or color at the current cursor
position.
Entry Conditions:
AH
= 9
BH = display page number (not used in graphics modes)
CX = number of characters to write
AL = character to write
BL = attribute of character (for alpha modes) or color of character
(for graphics
modes; if bit 7 of BL is set, the color of the
character is XOR’ed with the color value). See Scroll Up
(AH = 6) for attribute values and Set Color Palette (AH =
11) for color values.
Write Character Only
Write character only at current cursor position.
Entry Conditions:
AH = 10
BH = display page number (valld for alpha modes only
CX = number of characters to write
AL = character to write
BL = color of character (graphics mode)
Set Color Palette [31
Select the color palette.
200

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