DIGITAL-LOGIC AG MSM586SEN/SEV Manual V1.5E
69
BIOS Data Area Definitions
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Location Description
92h - 93h Scratch area for diskette media. Low byte for drive A, high
byte for drive B.
94h - 95h Current track number for both drives. Low byte for drive A,
high byte for drive B.
96h Keyboard Status
bit 7 = (1) Read ID
bit 6 = (1) Last code was first ID
bit 5 = (1) Force to Num Lock after read ID
bit 4 = (1) Enhanced keyboard installed
bit 3 = (1) Right ALT key active
bit 2 = (1) Right Control key active
bit 1 = (1) Last code was E0h
bit 0 = (1) Last code was E1h
97h Keyboard Status
bit 7 = (1) Keyboard error
bit 6 = (1) Updating LEDs
bit 5 = (1) Resend code received
bit 4 = (1) Acknowledge received
bit 3 = Reserved
bit 2 = (1) Caps lock LED state
bit 1 = (1) Num lock LED state
bit 0 = (1) Scroll lock LED state
98h - 99h Offset address of user wait flag
9Ah - 9Bh Segment address of user wait flag
9Ch - 9Dh Wait count, in microseconds (low word)
9Eh - 9Fh Wait count, in microseconds (high word)
A0h Wait active flag
bit 7 = (1) Time has elapsed
bits 6-1 = Reserved
bit 0 = (1) INT 15h, AH = 86h occurred
A1h - A7h Reserved
A8h - ABh Pointer to video parameters and overrides
ACh - FFh Reserved
100h Print screen status byte
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