Below is a diagram of the cable I am using. Dashed lines indicate changes. The 1581 information comes from the 1581 service manual. The PC information comes from the IBM PS/Valuepoint Hardware Maintenanve Manual, except for pins 1, 3, and 5. There does not appear to be any agreement on what should be on these pins, so I have listed what I have found on a number of HD drives. PC Drive B 1581 Gnd/NC 1 1 NC -Density Select 2 <---------, ,------> 2 -Disk Chg (pulled up to 5V) Gnd/NC/no pin 3 '-- | -------3 Gnd NC 4 | 4 NC Gnd/NC 5 | 5 Gnd NC 6 | 6 NC -Index 8 > | > 8 -IP (pulled up to 5V) -Motor Enable 0 10 < | < 10 Gnd -Drive select 1 12 <------------ | --, < 12 NC Gnd 13 | '--- 13 Gnd -Drive Select 0 14 < | < 14 NC -Motor Enable 1 16 < | < 16 -Motor On -Direction 18 < | < 18 -Dirc -Step 20 < | < 20 -Step -Write Data 22 > | > 22 -WD -Write Enable 24 < | < 24 -WG -Track 0 26 > | > 26 -Tr00 (pulled up to 5V) -Write Protect 28 > | > 28 -WPrt (pulled up to 5V) -Read Data 30 > | > 30 -RD (pulled up to 5V) -Select Head 1 32 < | < 32 Side 0 Gnd 33 ------------- | --, 33 Gnd -Disk Change 34 >-------------' '--> 34 -Rdy (pulled up to 5V) Gnd 7,9,11,15,17,19,21,23,25,27,29,31 Gnd Message was sent through the cbm-hackers mailing listReceived on 2016-08-20 05:00:34
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