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Pinouts for connecting an internal SCSI-2 connector
(50 pin header) to an external DB25 connector.

Function     DB25        SCSI
DB0            8           2
DB1           21           4
DB2           22           6
DB3           10           8
DB4           23          10
DB5           11          12
DB6           12          14
DB7           13          16
DB Parity     20          18
Gnd            7          20
Gnd            9          22
Gnd           14          24
Termpwr       25          26
Gnd           16          28
Gnd           18          30
ATN           17          32
Gnd           24          34
BSY            6          36
ACK            5          38
RST            4          40
MSG            2          42
SEL           19          44
CO            15          46
REQ            1          48
IO             3          50

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