Tandy 1000 Programmer's Reference Guide

Chapter 6 I BIOS Services
Get Shift Status
Return the current shift status.
Entry Conditions:
AH = 2
Exit Conditions:
AL = current shift status (bit settings: set = true, reset = false)
bit 0 = RIGHT SHIFT key depressed
bit
1 = LEFT SHIFT key depressed
bit
2 = CTRL (control) key depressed
bit
3 = ALT (alternate mode) key depressed
bit
4 = SCROLL state active
bit
5 = NUMBER lock engaged
bit
6 = CAPS lock engaged
bit
7 = INSERT state active
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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