Epson SQ-1170 Service Manual page 159

Table A-2. CN2 (C076 M A I N )
No. Signal Name
1 - + 5
2 - + 5
3 - + 5
4 - + 5
5 - + 5
6 - + 5
7 0
TXD
0 READY
8
9 I RXD
10 - NC
11 0 RST
12
0 INH
13 I
14 WRRDY
15
16
0 WR
0 RD
17
18
0 Cs
19 -
20 -
21 -
22 -
23 -
24 -
25 0 A3
26 0 A2
27 0 A l
28 0 AO
29 D7
30 D6
31 D5
32 D4
33 D3
34 D2
35
36 DO
Table A-3. CN3 (C076 M A I N )
No. Signal Name
1 - + 5
2 - + 5
3 - + 5
4 I ARE(3
5
0
6 0 PROG
7 0 RAM
8 0 CG
9 0 WR
10 0 CGA I 8
11 0 RD
12 0 CGA13
13
0 CGA I 4
14 0 RAM 14
15 0 CGA I 5
Function
+ 5 VDC
+ 5 VDC
+ 5
+ 5
+5 VDC
+5 VDC
Transmit data
Ready to receive data
Receive data
No connection
Reset
Inhibit
Command request
Write ready
Read request
Write
Read
chip select
Signal ground
Signal ground
Signal ground
Signal ground
Signal ground
Signal ground
Address bus bit 3
Address bus bit 2
Address bus bit 1
Address bus bit O
Data bus bit 7
Data bus bit 6
Data bus bit 5
Data bus bit 4
Data bus bit 3
Data bus bit 2
Data bus bit 1
Data bus bit O
Function
+5 VDC
+ 5 VDC
+ 5 VDC
Address request
P-ROM chip select
RAM chip select
CG ROM chip select
Write strobe
Read strobe
CG address bit 13
CG address bit 14
RAM address bit 14
CG address bit 15
Table A-3. CN3(C076 MAIN) (Cont.)
Signal Name
No.
16 0 RAM 15
17 0 CGA16
18 0 RAM 16
19 0 CGA17
20
0 AO
21 0 A l
22 0 A2
23 0 A3
24 0 A4
25 0 A5
26
0 A6
27 0 A7
28 0 A8
29 - + 5
30 - + 5
31 -
32 -
33 -
34 0
35 0 MREQ
36 0
37 0
38 0
39
0 CGA21
40 0
41
0 CGA I 9
42 0
43 0 RAMAl 3
44 0 A9
45 0 A lO
46 - NC
47 0 Al 1
48 - NC
49
0 Al 2
50 D7
D6
51
52 D5
53 D4
54 D3
55 D2
56
57 DO
58 -
59 -
60 -
A-3
Function
RAM address bit 15
CG address bit 16
RAM address bit 16
CG address bit 17
Address bit O
Address bit 1
Address bit 2
Address bit 3
Address bit 4
Address bit 5
Address bit 6
Address bit 7
Address bit 8
+ 5 VDC
+ 5 VDC
Signal ground
Signal ground
Signal ground
Program address bit 16
Memory request
Program address bit 15
Program address bit 14
CG address bit 22
CG address bit 21
CG address bit 20
CG address bit 19
Program address bit 13
RAM address bit 13
Address bit 9
Address bit 10
Not connect
Address bit 11
Not connect
Address bit 12
Data bus bit 7
Data bus bit 6
Data bus bit 5
Data bus bit 4
Data bus bit 3
Data bus bit 2
Data bus bit 1
Data bus bit O
Signal ground
Signal ground
Signal ground