DIGITAL-LOGIC AG
PCCP5 Manual V2.3
62
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
