420 Series 2-15
Procedure 2 Diagnostic Test Program Execution Check
The Floppy Disk Drive Diagnostic Test program is stored on the 420 series Diagnostics Disk.
After loading Toshiba MS-DOS, run the diagnostic program. Refer to Chapter 3, Tests and
Diagnostics, for more information about the diagnostics test procedures.
Floppy disk drive test error codes and their status names are described in Table 2-3. Make
sure the floppy disk in the FDD is formatted correctly and that the write protect tab is dis-
abled. If any other errors occur while executing the FDD diagnostics test, go to Check 1.
Table 2-3 Floppy disk drive error codes and statuses
Code Status
01h Bad command
02h Address mark not found
03h Write protected
04h Record not found
06h Media removed on dual attach card
08h DMA overrun error
09h DMA boundary error
10h CRC error
20h FDC error
40h Seek error
60h FDD not in drive
80h Time out error (Not ready)
EEh Write buffer error
FFh Data compare error
Check 1 If the following message is displayed, disable the write protect tab on the floppy
disk.
Write protected
If any other message appears, perform Check 2.
Check 2 Make sure the floppy disk is formatted correctly. If it is, go to Procedure 3.
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