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 Apple II Disk Drive Port

Apple II Disk Drive port

Type: 20-pin edge

Pin Function Details
1 Gnd
2 Phi0 (Stepper motor phase 0)
3 Gnd
4 Phi1
5 Gnd
6 Phi2
7 Gnd
8 Phi3
9 -12V
10 WrReq/ (Write gate, essentially)
11 +5V
12 +5V
13 +12V
14 Enbl/ (Drive select and motor on)
15 +12V
16 RdData/ (Read data output)
17 +12V
18 WrData (Write data input)
19 +12V
20 WProt (Write protect switch)

(Thanks to Tony Duell on the ClassicCmp mailing list)



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