HP 13255 Technical Information page 14

13255
General Purpose Asvnchronous Data Comm Module
13255-91089/12
Rev AUG-01-76
Table 6.3 Module Bus Pin Assiqnments
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--~~------~-----~--~----------~---~--~-----------------~-------~----~-----~-----
Function
Pertorme~:
Read Rp.ceived Data Character
Poll Bit: Not Applicable
Module Address: (ADON 11,10,9,4)
=
(Al1,~10,A9,A4)
Switch selectable (OOOl)=Oata Comm
(OI01)=Printer
-
-
Function Specif.ier:
ADDR5 = 0
AODR6
=
0
Data Bus Bit Interpretation:
A7
Data lnout Ait 7
Ro
Data Jnput Bit 6
RS
Data Input Bit 5
84 DatA Jnput Rit 4
83 O~ta
Input Rit 3
82
Data Tnput Ait 2
~1
Data Tnout Hit 1
AO Data Input Bit 0
Bus
Value 5iqnal
---
...
-
...
-
-----
...
--~-----
-------
--_
...
_
.....
-----
X
ADDR
15
X
ADOR
14
x.
AOOR
13
X
ADOR
12
Atl
ADOR 11
A10
ADOR
10
A9
ADDR 9
X
ADOR
8
X
ADOR
7
0
ADDR
(,
0
ADOR
5
A4
ADOR
4
X
ADOR
3
X
ADOR
2
X
ADDR
1
X
ADDR
0
------ ...
--.- ..
----~-
...
--
-~-
...
---
--
....
---------
87 BUS 7
86
BUS
6
85
AUS
5
64
BUS
4
63 BUS l
B2 BUS
,
B1
BUS
1
BO AUS
0
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l=[,oqjcal l=P.us LOw
O=IJooical O=Bus Hiqh
X=Don-t Care
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