Apple //e 80 Column & 64K Memory Card

To enter 80 column & 40 column switch mode,
: PR#3

1) 40 Column mode switch
: ESC + 4
2) 80 Column mode switch
: ESC + 8

To exit 80 column & 40 column switch mode,
: ESC + Ctrl-Q ; You must type "PR#3" to reactivate.