DIGITAL-LOGIC AG MSM586SEN/SEV Manual V1.5E
67
BIOS Data Area Definitions
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Location Description
50h - 5Fh Position of cursor for each video page. Current cursor po-
sition is stored two bytes per page. First byte specifies the
column, the second byte specifies the row.
60h - 61h Start and end lines for 6845-compatible cursor type. 60h
= starting scan line, 61h = ending scan line.
62h Current Video Display Page
63h - 64h 6845-compatible I/O port address for current mode
3B4h = Monochrome
3D4h = Color
65h Register for current mode select
66h Current palette setting
67 - 6Ah Address of adapter ROM
6Bh Last interrupt the occurred
6Ch - 6Dh Low word of timer count
6Eh - 6Fh High word of timer count
70h Timer count for 24-hour rollover flag
71h Break key flag
72h - 73h Reset flag
1243h = Soft reset. Memory test is bypassed.
74h Status of last hard disk operation
00h = No error
01h = Invalid function requested
02h = Address mark not located
03h = Write protect error
04h = Sector not found
05h = Reset failed
08h = DMA overrun error
09h = Data boundary error
0Ah = Bad sector flag selected
0Bh = Bad track detected
0Dh = Invalid number of sectors on format
0Eh = Control data address mark detected
0Fh = DMA arbitration level out of range
10h = ECC or CRC error
11h = Data error corrected by ECC
20h = Controller failure
40h = Seek operation failure
80h = Timeout
AAh = Drive not ready
BBh = Undefined error occurred
CCh = Write fault on selected drive
E0h = Status error or error register = 0
FFh = Sense operation failed
75h Number of hard drives
76h - 77h Work area for hard disk
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