AT&T 3B2 Off-Line Diagnostic Manual page 93

- - - - - - - - - - - - - - - - - - - - - Version 2 Hardware System Board Diagnostics
Test Numbers: 4 and 5
Function: These tests verify that the entire disk is formatted and that all tracks can be
read.
Procedure: The Identification (ID) field of each track is read, beginning with track 0 and
proceeding to the end of each side, comparing the actual track number read
against the expected track number.
Hardware Tested: The WD2797 Floppy Disk Controller/Formatter is tested.
Data Returned: The failing test number (last number displayed on the system console before
failure) is returned.
Notes: None
Test Numbers: 6 through 8
Function: These tests check the ability to write and read back a sector.
Procedure: Side 1, track 70, sector 1 is written with an increasing data pattern. The track
is read back, and the data is compared.
Hardware Tested: The WD2797 Floppy Disk Controller/Formatter is tested.
Data Returned: The failing test number (last number displayed on the system console before
failure) is returned.
Notes: None
Test Numbers:
Function:
Procedure:
9 through 11
These tests check the step, step in, and stepout commands.
The test procedure is as follows:
1. The heads are moved to track 35, and the head movement is
confirmed.
2. The step command is issued, and the head is confirmed to be located
over track 36.
3. The stepin command is issued, and the head is confirmed to be located
over track 37.
4. The stepout command is issued, and the head is confirmed to be
located over track 36.
Hardware Tested: The WD2797 Floppy Disk Controller/Formatter is tested.
Data Returned: The failing test number (last number displayed on the system console before
failure) is returned.
Notes: None
SYSTEM BOARD DIAGNOSTICS 3-53