A.1.1 Main Board (C169 MAI N-B Board)Table A-2. CN2 Pin Assignments
Pin No. Signal Name I/O Description
1Vss —Ground
2DQ0 I/O Data bus bit 0
3DQ16 I/O Data bus bit 16
4DQ1 I/O Data bus bit 1
5DQ17 I/O Data bus bit 17
6DQ2 I/O Data bus bit 2
7DQ18 I/O Data bus bit 18
8DQ3 I/O Data bus bit 3
9DQ19 I/O Data bus bit 19
10 Vcc —+5 VDC
11 NC —Not connected
12 MA0 OMemory address bit 0
13 MA1 OMemory address bit 1
14 MA2 OMemory address bit 2
15 MA3 OMemory address bit 3
16 MA4 OMemory address bit 4
17 MA5 OMemory address bit 5
18 MA6 OMemory address bit 6
19 MA10 OMemory address bit 10
20 DQ4 I/O Data bus bit 4
21 DQ20 I/O Data bus bit 20
22 DQ5 I/O Data bus bit 5
23 DQ21 I/O Data bus bit 21
24 DQ6 I/O Data bus bit 6
25 DQ22 I/O Data bus bit 22
26 DQ7 I/O Data bus bit 7
27 DQ23 I/O Data bus bit 23
28 MA7 OMemory address bit 7
29 NC —Not connected
30 Vcc —+5 VDC
31 MA8 OMemory address bit 8
32 MA9 OMemory address bit 9
33 RAS3 ORAS 3
34 RAS2 ORAS 2
35 MP2 —Not used
36 MP0 —Not used
37 MP1 —Not used
38 MP3 —Not used
39 Vss —Ground
40 CAS0 OCAS 0
41 CAS2 OCAS 2
42 CAS3 OCAS 3
43 CAS1 OCAS 1
44 RAS0 ORAS 0
45 RAS1 ORAS 1
46 NC —Not connected
47 WE OWrite enable
48 NC —Not connected
49 DQ8 I/O Data bus bit 8
Appendix EPL-5500 Service Manual
A-4 Rev. A