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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