HP 13255 Technical Information page 16

13255 13255-91032/14
Cartridge Tape ~Odlll~ Rev AUG-Ol-76
Table
5.2
Module Bus Pin Assignments
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Function
Performed: Input Status From eTU
Poll Bit: Bit 7
Module Address: (AODR
11,10,9,4)
=
(1011)
Function Specifipr: ADDR5 = 0
Data Bus 8it Interpretation:
B7 - Not APplicable
80 -
BYTE ROY 1s set to "1" in Read mode when the
preamble is detected or a byte Is ready to be
read from the eTU Module or can be accepted for
recording. BYTE RDY is set in Record mode when
a byte has been encoded.
B!:> - GAP
is the output of toe
qap
detector on the
Read/Write PCA.
84 - HOLE is set to "1" whenever a hole is detected
on the tape and is cleared when status is read.
B3 - TAK is the frequency ot the tachometer divided
by
2. There are
58.4
transitlorts of the
TA~
status per inch of tape movement.
Bus I
Value Signal I
======= ============1
X AODR 15 I
X ADDH 14 I
X ADDF 13 ,
X
ADDR
12 I
1
ADDR
11 I
o
ADDR 10 I
1 ADDR 9 ,
X
ADDF
8 I
X ADDR 7
X
ADDR
6
o
ADDR 5
1
ADDR
4
X ADDR 3
X ADDR 2
X AODR 1
X
ADOR
0
----~-- -~----~~~~~-
-~----- -~~---~-~---
87 BUS 7
86 BUS 6
tl5 BUS 5
84 FHJS 4
83 BUS 3
82
BUS 2
Bl BUS 1
BO BUS 0
====================
l=Logical l=Bus LOW
O=Logical O=Bus High
X=Don't Care
--~~~-~~~---~-~~~~~~~
--~---~~--~~~-~~~-~~~
Bi - RIP indicates the presence of head current while recording a gap.
The state of this signal Is not defined during read operations or
while data Is being recorded.
o
= No write current (tape protected)
1
= Write current present while in gap
B1 - eIR indicates that a cartridge is inserted in the right CTU
Transport Assembly and is cleared when the cartridge is removed.
o
= No cartridge in rioht eTU Transport Assembly
1
= Cartridge inserted in rignt CIU Transport Assembly
80 - elL indlc~tes that a cartridge is inserted in the left eTU
Transport Assembly and is cleared when the cartridge is removed.
o
= No cartridge in left CTU Transport Assembly
1
=
Cartridge inserted 1n left CTU Transport Assembly
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