Sharp PC-4741 Service Manual page 66

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P C-4741
No.
Signal name 110 Description
No.
Signal name
110
Description
53
IROZ~
0
V40 channel 7 inter
nl
,onuo.' .;nnal
108 SA3 I
S~t~.'!1_
address bus 3
54 EXTM
0
External memory active signal (active low) 109 SA4 I System address bus 4
55
rnro
0
External
1/0
active signal (active low) 110 SA5 I System address bus 5
56
FIm
0
Floppy disk controller select signal (active
111 SA6 I
System address bus 6
low)
112 Vee +5Vsupply
57
oSI<ORG
I Input to disk change signal (active low)
113 GND
OV, ground
58
HID
0
(active low)
114 SA7 I System address bus 7
59 107A 0
7 AH
1/0
port select signal (active low)
115 SAB I System address bus 8
60
CSCOMA
0
COMA chip select signal (active high)
116 SAS I
System address bus 9
61 SIRQ I
Input to 82C50 interrupt request Signal
117
SAl a I System address bus 10
62
SiN'i'EFI
I
Input to 82C50 interrupt enable signal
118 SAil
I System address bus 11
63 CSCOMB 0 COMB chip select signal (active high)
119 SA12 I System address bus 12
64 COMII2 I
Input to COM 1, COM 2 select signal from
120 SA13 I System address bus 13
the sub-CPU
121 SA14
I System address bus 14
65 BUSY I
Input to printer busy signal
122 SA15 I
System address bus 15
66
ACR
I
Input to printer acknowledge signal
123 SA16 I System address bus 16
67
PE
I
Input to printer paper empty signal
124 SA17
I System address bus 17
68 SELECT I
Input to printer select Signal
125 SA18 I System address bus 18
69
1:Ri'il5R
I
Input to printer error signal
126 SA19 I
System address bus 19
70 SEL 0 Printer select signal
127
AEN 0 DMA refresh active signal
71 IN IT 0
Printer initialize signal
128
REf'RQ
I Input to refresh request signal from V40
72 AUTOFD 0
Printer lineteed enable signal
73 STROBE 0
Printer strobe signal
74
J>lS[j[Q
0
Data oulput 0 to printer
75
J5l5l5[1
0
Data output 1 to printer
76
PPDL2
0
Data output 2 to printer
77
J51'l)(3
0
Data output 3 to printer
78
1'I'D[4
0 Data output 4 to printer
79
pj5JJ[5
0 Data output 5 to printer
80 Vee
+5V supply
81 GND OV, ground
82
pj5JJ[5
0
Data output 6 to printer
83
>'I"OCf
0
Data output 7 to printer
84 TSTCLK I
Test clock input
85 S 0
LCD scan start signal
86 CPI 0 LCD data latch signal
87 CP2 0
LCD data shift clock
88
LCDUO
0 Upper row LCD data 0
89 LCDUI 0
Upper row LCD data 1
90
LCDU2
0
Upper row LCD data 2
91
LCDU3 0 Upper row LCD data 3
92 LCDLO 0
Lower row LCD data a
93 LCDLI 0
Lower row LCD data 1
94 LCDL2 0
Lower row LCD data 2
95
LCDL3 0 Lower row LCD data 3
96 VOSC I
LCD controller clock input
97 SDO I/O
System data bus a
98
SDI I/O System data bus 1
99 SD2 I/O System data bus 2
100 SD3 I/O
System data bus 3
101 SD4 I/O System data bus 4
102 SD5 I/O
System data bus 5
103 SD6 I/O System data bus 6
104 SD7 I/O System data bus 7
105
SAO I
System address bus a
106 SA1 I
System address bus 1
107 SA2 I
System address bus 2
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