The C65 is lacking support for tape on all levels:
- no connector, not even conducting paths on the board
- the io-port $00/$01 was moved from 6510-CPU to VIC-III and only support the lowest 3 bits (ROM banking), bits 3-5 (which were used for tape) are "dropped"
- the C64 kernel got all tape routines removed
And why would you still want tape? You've got a floppy drive built in.