DIGITAL-LOGIC Microspace MSM586SEN Technical User Manual page 298

DIGITAL-LOGIC AG
BIOS Data Area Definitions
Location Description
3Fh Diskette Drive Motor Status
bit 7
bit 6
bits 5-4 = Drive Select
bits 3-2 = Reserved
bit 1
bit 1
40h Diskette Drive Motor Timeout
Disk drive motor is powered off when the value via the INT 08h
timer interrupt reaches 0.
41h Diskette Drive Status
bit 7
bit 6
bit 5
bits 4-0 = Error Codes
42h - 48h Diskette Controller Status Bytes
49h Video Mode Setting
4Ah - 4Bh Number of Columns on screen
4Ch - 4Dh Size of Current Page, in bytes
4Eh - 4Fh Address of Current Page
Continued...
Continued...
= Current operation
0 = Write or Format
1 = Read or Verify
= Reserved
00 = Drive A
01 = Drive B
0 =
1 =
= Drive B Motor Status
0 = Off
1 = On
= Drive A Motor Status
0 = Off
1 = On
= Drive Ready
0 = Ready
1 = Not ready
= Seek Error
0 = No error
1= Error occurred
= Controller operation
0 = Working
1 = Failed
00h = No error
01h = Invalid function requested
02h = Address mark not located
03h = Write protect error
04h = Sector not found
06h = Diskette change line active (door
opened)
08h = DMA overrun error
09h = Data boundary error
0Ch = Unknown media type
10h = ECC or CRC error
20h = Controller failure
40h = Seek operation failure
80h = Timeout
66
MSM586SEN/SEV Manual V1.5E
Disable
Enabled