DIGITAL-LOGIC Microspace MSM586SEN Technical User Manual page 181

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BIOS Data Area Definitions
Location Description
15h - 16h Reserved
17h Keyboard Shift Qualifier States
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
18h Keyboard Toggle Key States
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
19h Scratch area for input from Alt key and numeric keypad
1Ah - 1Bh Pointer to next character in keyboard buffer
1Ch - 1Dh Pointer to last character in keyboard buffer
1Eh - 3Dh Keyboard Buffer. Consists of 16 word entries.
3Eh Diskette Drive Recalibration Flag
bit 7
bits 6-4 = Not used
bits 3-2 = Reserved
bit 1
bit 0
Continued...
Continued...
= Insert mode
= CAPS lock
= Numlock
= Scroll Lock
= Either Alt key
= Either control key
= Left Shift key
= Right shift key
0 = not set / 1 = set
= (1) Insert held down
= (1) CAPS lock held down
= (1) Num Lock held down
= (1) Scroll Lock held down
= (1) Control+Num Lock held down
= (1) Sys Re held down
= (1) Left Alt held down
= (1) Left Control held down
= (1) Diskette hardware interrupt occurred
= (0) Recalibrate drive B
= (0) Recalibrate drive A
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MSM586SEN/SEV Manual V1.5E