Technical data

Table 4–10: TSZ07 Configuration Parameters
Configuration Parameter Default Options
Unit address (UNIT) 4 0 to 7
Host supplied parity (HOST PAR) yes yes or no
Default density (DFLT DEN) 6250 bpi 1600 or 6250 bpi
Write sync option 2 file marks No sync, 1 file mark, 2 file marks, always
Synchronize on reverse (SYNC
REV). When "yes", only the second
WRITE in a WRITE, BACKSPACE,
WRITE string is recognized.
no yes or no
Read error retries (RD RETRY) 8 0, 1, 2, 4, 8, 16
Write error retries (WR RETRY) 16 0, 1, 2, 4, 8, 16
Allows one track write errors in
GCR (1 TRKWER)
no yes or no
Block size (BLK SIZE) 0 0, 4, 8, 16, 32, . . . 32K, 64K
Return ready status during rewind
immediate (RWD RDY)
yes yes or no
Synchronous data transfer request
initiation (SDTRINIT).
1
When "yes",
the target will attempt synchronous
data transfer negotiation with the
host.
no yes or no
Two’s Compliment (2’s COMP)
1 2
When "yes", makes the drive a
bootable device from the host.
no yes or no
Note: Two’s compliment will be supported in a later version of VMS.
1
This configuration is not selectable in some early models, depending on the two firmware chips installed (in
sockets) on the interface circuit board (see Figure 5-15 for location of the board). If the chips are P/N 967018-xxx
or 967019-xxx, the feature is selectable.
2
Earlier versions of the tape drive will not have the two’s compliment as part of the NOVRAM.
For example, assume that you want to change the host supplied parity (HOST PAR) from
yes—the default—to no (refer to Table 4–10).
1. Select Service Aid 142. This places the drive in Review Mode.
2. Press switch 1 two times to view the host supplied parity (HOST PAR).
3. Press switch 3 to enter the Change Mode (refer to Table 4–9) to change the current
parameter being viewed.
4–14 Troubleshooting