|''Pin No. (Shugart)''||''Pin No. (CPC manual)''||''Signal Name''||''Description''
|-
|n/a||"35"||N/C||Schneider CPC6128 only|-|1 (red wire)||34||GND||Ground
|-
|2||33||N/C (/REDWC)||Density Select 1=Low/0=High
|32||3||/SIDE1||0=Side 1 Select
|-
|34||1(blue wire)||/DSKCHG (CPC: /RDY)||1=Disk Change/0=Ready (CPC: Won't check for 1)|}-|All others||Ground|)