8 DB0/ Data bit 0
9 GND Signal ground
10 DB3/ Data bit 3
11 DB5/ Data bit 5
12 DB6/ Data bit 6
13 DB7/ Data bit 7
14 GND Signal ground
15 C/D/ Common/Data
16 GND Signal ground
17 ATN/ Attention
18 GND Signal ground
19 SEL/ Select
20 DBP/ Data parity
21 DB1/ Data bit 1
22 DB2/ Data bit 2
23 DB4/ Data bit 4
24 GND Signal ground
25 TPWR Terminator power
- Connector type: DB-25
- Total length of all cables not to exceed 6 m (20 ft.)
!! WARNING: The SCSI port uses the same type of connector as a standard RS-
232, DB-25 serial interface, but it is electrically very different. Do not
connect any RS-232 device to this connector. Doing so can result in damage to
both the device and the Macintosh Classic. !!
Disk drive port
Pin Signal name Signal description
1 GND Signal ground
2 GND Signal ground
3 GND Signal ground
4 GND Signal ground
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