HP 12606B Operating And Service Manual page 55

Table 3A. Conll11and Select Codc (12606B)
OTA/B Olitputs track and sector address to Disc Controller:
LIA/B
.BIT 15: DIRECTION: "1" = 'WRITE DISC; "0 "= READ DISC
BITS 13-7: TRACK SELECTION: OCTAL 000-177
BIT 14: Not Used
BITS 6-0: STARTING SECTOR ADDRESS: OCTAL 000-131
Inputs status word:
BIT 15: SECTOR FLAG:
"1
u=
Sector indicated by bits 14-8.
is not accessible on this revolution.
BITS 14-8: Address of "NEXT SECTOR", OCTAL 000-131;
if BIT 15 is not
=
"1 ", this sector may be accessed
on the same revolution with the probability
indicated in Figure 2. .
BIT 7: "1"
=
Disc is up to speed.
BIT 6:
BIT 5:
BIT 4:
BIT 3:
BIT 2:
BIT 1:
BIT 0:
"1
I'
= Head change in progress; used only for
diagnostic purposes.
"lH Sector address coincidence; used only for
diagnostic purposes.
Not Used
"1" = Abort; transfer possibly not completed.
"1" = WRITE ENABLED; current track is not
protected.
"1"
=
READ PARITY ERROR.
"1" = BUSY; transfer has been initiated, is in
progress, or is being terminated.
Note: Initiation of a new transfer clcars all error status bits.
12606-9001
Added 3 Dec. 1969 8A