IBM 9348 Service Information page 260

Diagnostic Test 163 (Forward Space File)
Blocks are spaced over until a file mark is detected.
Diagnostic Test 164 (Backspace File)
Blocks are spaced over until a file mark is detected. This test cannot be run from
BOT. Test 163 must be run first.
Diagnostic Test 165 (Load Tape)
Diagnostic Test 166 (Rewind)
Diagnostic Test 167 (Unload Tape)
Parameter Door Control
A
0
The door remains closed.
1 The door opens.
Note: Tests 170-175 are run by the controller card and will attempt the operation
again if a failure occurs.
Diagnostic Test 170 (Write Tape Mark to Buffer)
A tape mark entry is generated in the buffer without writing it to tape.
Diagnostic Test 171 (Create Record in Buffer)
Parameter A = pattern; parameter
B = record size.
A record is generated in the buffer without writing it to tape. The pattern parameter
indicates the type of data to be generated.
Parameter Pattern
A
0 All zeros
1 All ones
2 At ternating all zeros, all ones
3 Rotating data bytes (0
..
255)
4 Pseudorandom data
5
Use existing data in buffer storage
6 Rotating data with parity error on the last byte
Parameter Record Size
A
0 1 byte
1 256 bytes
8-18
Service Information