12(0C) |
4 |
DCBBLKCT |
Number of blocks in the file on the current volume to the current
position. |
16(10) |
1 |
DCBTRTCH |
Tape recording technique for 7-track tape. |
|
|
|
Code |
|
|
0010 0011 |
- E
- Even parity.
|
|
|
0011 1011 |
- T
- BCD/EBCDIC conversion.
|
|
|
0001 0011 |
- C
- Data conversion.
|
|
|
0010 1011 |
- ET
- Even parity and conversion.
Tape recording technique for a magnetic tape subsystem
with Improved Data Recording Capability. Use TRTCH to override the
system default value.
|
|
|
0000 1000 |
- COMP
- Record data in compacted format.
|
|
|
0000 0100 |
- NOCOMP
- Record data in standard format.
|
17(11) |
1 |
DCBDEVT |
Device type. |
|
|
1000 .... |
Class of device. This code means magnetic tape. |
|
|
.... xxxx |
Type of magnetic tape. |
18(12) |
1 |
DCBDEN |
Tape density—3400 series magnetic tape units. |
|
|
|
Code |
|
|
0100 0011 |
- 1
- 556 BPI (7-track) N/A (9-track) N/A (18-track)
|
|
|
1000 0011 |
- 2
- 800 BPI (7-track) 800 (9-track) N/A (18-track)
|
|
|
1100 0011 |
- 3
- N/A BPI (7-track) 1600 (9-track) N/A (18-track)
|
|
|
1101 0011 |
- 4
- N/A BPI (7-track) 6250 (9-track) N/A (18-track)
|