Disk Drive Port 
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Pin Signal name Signal description 
1 GND Signal ground 
2 GND Signal ground 
3 GND Signal ground 
4 GND Signal ground 
5 -12v -12 volts DC 
6 +5v +5 volts DC 
7 +12v +12 volts DC 
8 +12v +12 volts DC 
9 NC No connection 
1 PWM Motor speed control 
11 PH0 Register select CA0 
12 PH1 Register select CA1 
13 PH2 Register select CA2 
14 PH3 Register write strobe LSTRB 
15 WRREQ/ Write request 
16 SEL Register select line SEL 
17 ENBL/ Drive enable 
18 RD Read data 
19 WR Write data

- Connector type: DB-19

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