Tandy 1000 SL Technical Reference Manual page 558

BIOS Services
Diskette Change Line Status
Return the status of the diskette change line.
Entry Conditions
AH
=
16H
DL
=
drive
number (0-2 if Tandy 1000 TL; 0-1 if Tandy
1000 SL)
Exit Conditions
CF
=
0: I f A H = O
CF
=
1 : IfAHisnonO
AH
=
0: Diskette change signal not active
=
1 : Invalid diskette parameter
=
6: Diskette change signal active
=
80: Diskette drive not ready (drive door is open)
Exits From All Calls
AH
Error Code Condition
01H Illegal Function
02H
Address Mark
Not
Found
03H Write Protect Error
04H Sector Not Found
06H Diskette Change Line Active
08H DMA Overrun
09H
10H
20H Controller Failure
40H Seek Failure
80H
[NC]
[C]
=
Status of operation, where set
=
true
Attempt to DMA Across a 64K Boundary
Bad CRC on Disk Read
Device Timeout, Device Failed to Respond
=
operation successful (AH
=
0)
=
operation failed (AH
=
error status)
37.