Atari Connection Machine
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Atari ST family connectors pinouts

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3.5" ST floppy internal

idc 34 Male

IDC 34 Male at floppy drive side
1 GND 2 /REDWC Density Select (MEGA STE/TT030/Falcon030)
3 GND 4 not connected
5 GND 6 not connected
7 GND 8 /INDEX Index
9 GND 10 /D0SEL Drive Select 0
11 GND 12 /D1SEL Drive Select 1 (STE/MEGA STE)
13 GND 14 not connected
15 GND 16 /MTRON Motor On
17 GND 18 /DIR Direction
19 GND 20 /STEP Step
21 GND 22 /WDATA Write Data
23 GND 24 /WGATE Floppy Write Enable
25 GND 26 /TRK00 Track 0
27 GND 28 /WPT Write Protect
29 GND 30 /RDATA Read Data
31 GND 32 /SIDE1 Head Select
33 GND 34 DCH Disk Change (TT030/Falcon030)

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