40 Pin to 50 Pin SCSI Adapter wiring - BlueSCSI/BlueSCSI-v2 GitHub Wiki

Here is a simple wiring diagram to use the BlueSCSI desktop version to backup 2.5" 40 pin SCSI drives.

The wiring description is intended for modifying a simple 2.5" IDE cable that will be split up in several chunks and then inserted into a 2x25 pin 2.54mm IDC connector.

SCSI      SCSI
40pin     50pin     
   
 1   +5V      ext. Supply
 2   +5V      ext. Supply
                           i.e. Molex
 3   GND      ext. Supply
 4   GND      ext. Supply
      
 5   GND   1
 6   DB0   2  
 7   GND   3
 8   DB1   4
 9   GND   5
10   DB2   6
11   GND   7
12   DB3   8
13   GND   9
14   DB4  10
15   GND  11
16   DB5  12
17   GND  13
18   DB6  14
19   GND  15
20   DB7  16
21   GND  17
22   DBP  18
          19
          20
          21
          22
          23
          24
23   GND  25 
24   TERM 26  (or +5V supply on 40p side)
          27
          28
          29
          30
          31
25   ATN  32
          33
          34
          35
26   BSY  36
27   GND  37
28   ACK  38
          39
29   RST  40
          41
30   MSG  42
31   GND  43
32   SEL  44
          45
34   C/D  46
35   GND  47
36   REQ  48
          49
33   I/O  50  (yes, this pin is "out of order")
   
37   GND      ext. Supply
38   GND      ext. Supply
                           i.e. Molex
39   +5V      ext. Supply
40   +5V      ext. Supply