DIGITAL-LOGIC AG
PCCP5 Manual V2.3
60
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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