Epson PC AX Technical Manual page 251

Microcomputer system
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HEV.A
DIAGRAKS
AN»
REFERENCE MATERIALS
+----------+----------+---------------------------+
:
Bit no. :
PIN no. :
Signal Name
:
+----------+----------+---------------------------+
:
0
not use
:
1
not use
:
2
not use
:
3
15
Error
:
4
13
Se1ect
l
5
12
P.END (out of paper)
:
6
10
Acknow1edge
l
7
11
Busy
+----------+----------+---------------------------+
If an error is detected, the error message that identica1 to
that of Item 1) is disp1ayed.
b.
The test data "05h" is output to the contro1 port
(37~
and
the test data "OOh" is output to the data output port (378).
Next, input from the status port (379); the resu1t is OK if
Bits 7, 4, and 3 are "0" and Bits 6 and 5 are "1".
If an error is detected, the error message that identica1 to
that of Item 1) is diap1ayed.
c.
Test data is output to the contro1 port and data output port
so that each signal of the status port go es ON, then the
resu1ts are checked.
If an error is detected, the error message that identica1 to
that of Item 1) is disp1ayed.
7-77

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