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30 pins connector 
 2  4  6  8 10 12 14 16 18 20 22 24 26 28 30
-- -- -- -- -- -- -- -- -- -- -- -- -- -- --
-- -- -- -- -- -- -- -- -- -- -- -- -- -- --
 1  3  5  7  9 11 13 15 17 19 21 24 25 27 29
Pin Name Description
1 GND Ground
2 GND Ground
3 VCC +5 VDC
4 VCC +5 VDC
5 SD1 Data Bus 1
6 SD0 Data Bus 0
7 SD3 Data Bus 3
8 SD2 Data Bus 2
9 SD5 Data Bus 5
10 SD4 Data Bus 4
11 SD7 Data Bus 7
12 SD6 Data Bus 6
13 /SDREQ DMA Request
14 /INTX Interrupt Request
15 /CSS Chip Select
16 /SDACK DMA Acknowledge
17 /IOR I/O Read
18 /IOW I/O Write
19 A8 Address Bus 8
20 7M 7.16 MHz System Clock
21 A6 Address Bus 6
22 A7 Address Bus 7
23 A4 Address Bus 4
24 A5 Address Bus 5
25 A2 Address Bus 2
26 A3 Address Bus 3
27 /IFRST +5 VDC
28 A1 Address Bus 1
29 GND Ground
30 GND Ground
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Source(s) of this and additional information: Darren Ewaniuk"s CDTV Technical Information, from Hardware Book
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