Tandy 1000 Programmer's Reference Guide

Chawter 6 I BIOS Services
E xi t Conditions:
CX = high (most significant) portion of clock count
DX = low (least significant) portion of clock count
AL = 0 of the clock was read or written (via AH = 0,l) within
Set Time Of Day
Set (write) the time of day using binary format.
Entry Conditions:
AH = 1
CX = high (most significant) portion of clock count
DX = low (least significant) portion of clock count
Sound Multiplexer
Sets the multiplexer for audio source.
Entry Conditions:
AH = 80
AL = source of sound
the current 24-hour period; otherwise, AL > 0
00
= 8253 channel 2
02
= audio in
03 = complex sound generator chip
209

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