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Pin
I/O
SYMBOL
Signal name and Description
51
I
RFEND
RFEND1: Refresh end signal
52
I
FDRDY
FDRDY1: FDD ready
53
I
Vee
MVRAM: 5Vdc
54
I
lBAT
lBATO: low battery signal
55
0
A011: Sysgtem address bus
56
I
RPDA
RPDAT1: Receive PS data
57
I
ZRDIS
ZRDISO: V-RAM disable signal
58
I
MIRQ
MIRQO: Modem interrupt request
59
0
SPDA'
SPDATO:
Send PS data. Normally inverted data is output
60
0
PRTSl
PRTSlO: Printer select signal
61
I
CEl
CElO: V-RAM chip enable signal
62
I
AOO
AOB 1: System address
63
I
DACKO
DACKO: Memory refresh signal
64
0
FDDSl
FDDSlO: FDD select signal
65
GND
Ground
66
0
DGDIS
DGDIS 1: Display GA disable
67
I
lOR
10RDO: I/O read. When this is low, data is output
68
I
lOW
10WRO: I/O write
69
I
RESET
RESETO: System address bus
70
I
A19-15
A 191-151: System address bus
-
74
75
I
A13
A131: System address bus
76
I
A02
A021: System address bus
77
I
A14
A 141: System address bus
E - 5
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