RWC pin  Sig  Function
   1    - 5 V
 2      + 12 V
   3  
 4    
   5  
 6      GND
   7    PB3 P1B3   CS (Card Select)
 8      PB2 P1B2   CS
   9    PB4 P1B4   ICS (Internal Card Selection)
10      PB1 P1B1   CS
  11    PB5 P1B5   ICS
12      PB0 P1B0   CS
  13    PB6 P1B6   ICS
14      PC3 P2B3   
  15    PB7 P1B7   ICS
16      PC2 P2B2   Read
  17    PC1 P2B1   Write
18      PC0 P2B0   Bus expand
  19    PC4
20      PC5
  21    PC6
22      PC7
  23    PA7 P0B7   \
24      PA0 P0B0   |
  25    PA6 P0B6   | 
26      PA1 P0B1   | Data bus
  27    PA5 P0B5   |
28      PA2 P0B2   |
  29    PA4 P0B4   |
30      PA3 P0B3   /
  31    + 5 V



non-standard floppy-molex connector usage

   ____________
  /            \
  | 4  3  2  1 |
  +------------+

  4  - 5 V
  3  + 12 V
  2  GND
  1  + 5 V