SUMMARY Table
Pin # Name Note
1 RDY- I/O ID and ready
2 DKRD- I MFM input
3 GRND G -
4 GRND G -
5 GRND G -
6 GRND G -
7 GRND G -
8 MTRXD- 0 Motor control.
9 SEL2B- 0* Select drive 2
10 DRESB- 0 Reset
11 CHNG- I/O Msk changed
12 +5v PWR 540 mA average 870 mA surge
13 SIDEB- 0 Side 1 if low
14 WRPRO- I/O Write protect
15 TK0- I/O Track 0
16 DKWEB- O Write gate
17 DKWDB- O Write data
18 STEPB- O Step
19 DIRB O Direction (high is out)
20 SEL3B- O* Select drive 3
21 SELlB- O* Select drive 1
22 INDEX- I/OO Index
23 +12v PWR 120 mA average 370 mA surge
KEY TO CLASS:
G ground, note connector shield grounded.
I input pulled up to 5v by 1K ohm.
I/O input in driver, but bidirectional input (1k pullup)
O output pulled though 1K to 5v
O* output, separates resources.
PWR available for external use, but currently used up by external drive.
- 354 Appendix I -
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