DIGITAL-LOGIC AG MSM586SEN/SEV Manual V1.5E
65
BIOS Data Area Definitions
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Location Description
15h - 16h Reserved
17h Keyboard Shift Qualifier States
bit 7 = Insert mode
bit 6 = CAPS lock
bit 5 = Numlock
bit 4 = Scroll Lock
bit 3 = Either Alt key
bit 2 = Either control key
bit 1 = Left Shift key
bit 0 = Right shift key
0 = not set / 1 = set
18h Keyboard Toggle Key States
bit 7 = (1) Insert held down
bit 6 = (1) CAPS lock held down
bit 5 = (1) Num Lock held down
bit 4 = (1) Scroll Lock held down
bit 3 = (1) Control+Num Lock held down
bit 2 = (1) Sys Re held down
bit 1 = (1) Left Alt held down
bit 0 = (1) Left Control held down
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 = (1) Diskette hardware interrupt occurred
bits 6-4 = Not used
bits 3-2 = Reserved
bit 1 = (0) Recalibrate drive B
bit 0 = (0) Recalibrate drive A
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