User`s manual

DIGITAL-LOGIC AG MSLB-P5 Manual V0.3
PRELIMINARY 205
Continued
BIOS Data Area, Continued
8 Not used
9-11 Number of serial adapters
12 Game Adapter installed
13 Not used
14,15 Number of parallel adapters
Offset Size Description
12 1 Interrupt flag (POST)
13 2 Memory size (K bytes)
15 1 Reserved
16 1 Control flag
Keyboard Data Area
Offset Size Description
17 1 Keyboard flag 0:
Bit .... Definition
0....... Right shift key pressed
1....... Left shift key pressed
2....... Control key pressed
3....... Alt key pressed
4....... Scroll lock on
5....... Num lock on
6....... Caps lock on
7....... Insert mode on
18 1 Keyboard flag 1:
Bit .... Definition
3....... Freeze state
4....... Scroll lock pressed
5....... Num lock pressed
6....... Caps lock pressed
7....... Insert mode pressed
19 1 Keypad input byte
1A 2 Key buffer head
1C 2 Key buffer tail
1E 20 Key buffer
Diskette Data Area
3E 1 Seek/recalibrate status
3F 1 Drive motor status
40 1 Motor on time
41 1 Diskette status:
BitDefinition
7....... 1 = Drive not ready
6....... 1 = Seek error occurred
5....... 1 = Diskette controller failed
4-0.... Error codes:
... 01h = Illegal function request
... 02h = Address mark not found
... 03h = Write protected error
... 04h = Sector not found
... 06h = Diskette change line active
... 08h = DMA overrun on operation
... 09h = Data-boundary error (64k)
... 0Ch = Media type not found
... 10h = Uncorrectable ECC or CRC error
... 20h = General controller failure
... 40h = Seek operation failed
... 80h = Device did not respond
42 7 Controller status
Video Data Area
Offset Size Description
49 1 Video mode
4A 2 Video columns
4C 2 Video length
4E 2 Video start
50 10 Cursor locations
60 2 Cursor size
62 1 Active page
63 2 6845 address
65 1 Mode register value
66 1 Video palette