Epson PX-8 - Page 324

REV.-A
Pin No. Signal Name
In/Out Function
8
SADO
In/Out
System (slave CPU 6303) address data bus 0:
Data is
input/output synchronizing to SE sig-
nals.
9
SAD 1
In/Out System (slave CPU 6303) address data bus 1 :
Data is
input/output synchronizing to SE sig-
nals. Pins
10- 14 missing
15
SAD 7
In/Out
System (slave CPU 6303) address data bus 7:
Data is
input/output synchronizing to SE sig-
nals.
16 SA8 In
System (slave CPU 6303) address data bus 8:
Data is
input/output synchronizing to SE sig-
nals.
17 SA9
In
System (slave CPU 6303) address data bus 9:
Data
is input/output synchronizing to SE sig-
nals.
18 SA 10
In
System (slave CPU 6303) address data bus 10:
Data
is input/output synchronizing to SE sig-
nals.
19
SA 11 In
System (slave CPU 6303) address data bus 11 :
Data
is input/output synchronizing to SE sig-
nals.
20
SA 12 In
System (slave
CPU 6303) address data bus 12:
Data is
input/output synchronizing to SE sig-
nals.
21
N/C
-
Not used.
--
22
PCS In Port chip select: Provided from GAH40H
--
23 PWR
In Port write (write port data 0 to 7):
Provided
from GAH40M.
24 PR 0
In Port read (read port data 0 to 7):
Provided
from GAH40M.
25
PAO
In Port address 0 (address 0 of main CPU):
Selects
port register.
26
PDO
In/Out Port data (data bus of main CPU) 0
27
PO 1
In/Out
Port data (data bus of main CPU) 1
28
PO 2
In/Out
Port data (data bus of main CPU) 2
7-53