Tandy 1000 Programmer's Reference Guide

ChaDter 6 I BIOS Services
Attributes:
Color modes:
for e gr ound color
:
bit 0 = blue
bit
1 = green
bit
2 = red
bit
3 = intensity
All bits off
= black
background color:
bit
4 = blue
bit
5 = green
bit
6 = red
bit
7 = blink
All bits off = white
Scroll Down
Scroll active page down.
Entry Conditions:
AH = 7
AL = number of lines to scroll (0 means blank entire window)
CH = row of upper left corner of scroll window
CL = column of upper left corner of scroll window
DH = row of lower right corner of scroll window
DL = column of lower right corner of scroll window
BH = attribute (alpha modes) or color (graphics modes) to be
used on blank line. See Scroll. Up
(AH =6) for attribute
values
and Set Color Palette (AH = 11) for color values.
Read Attribute or Color/Character
Read a character and its attribute or color at the current cursor
position.
Entry Conditions:
AH = 8
BH = display page number (not used in graphics modes)
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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