IBM System/360

7340 HYPERTAPE DRIVE (Continued)
Byte 3, Bits 0-5 - Reserved for diagnostic information.
Byte 3, Bit 6 - Last Operation Low Density will be set whenever
the last operation affecting the tape drive included a Low
Density modifier. If the last drive operation was a Control,
this bit will never be present since low density is not specified
for Control. If the last drive operation was a Read or Write,
this bit will reflect the density setting at which the operation
was performed.
Byte 3, Bit 7 - IRG Control Latch On is set whenever a Write
Continuous is programmed and remains on as long as program
reinstruct is possible. This bit is included so that the timing
of the rein$truct singleshot can be checked by program means
to insure that it is not too short, which will shorten the pro-
gram re instruct interval, nor too long, which exceeds the
specification of the tape drive.
108 S/360
IBM CONFIDENTIAL