Tandy 1000 Programmer's Reference Guide

Chapter 1 I System Calls
SetDate
Set Date Function Call 2BH
Sets the date to a valid date in binary given in CX and DX.
Entry Conditions:
AH = 2BH
CX = year (1980-2099)
DH = month (1 = January, 2 = February, etc.)
DL = day of the month (1 -31)
Exit Conditions:
If AL = 00H, the date was valid.
If AL
= FFH, the date was not valid and the function was
canceled.
Macro Definition:
set-date macro year ,month ,day
mov cx,year
mov dh ,month
mov dl ,day
mQV ah ,ZBH
Int 21 H
endm
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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