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Accessing 80-column mode from CP/M



Any ideas from how I tell CP/M software to use an 80 column card?
Display is 40 col from motherboard, all I get from 80 col card is a
blinking cursor.

No switches or id on 80 col card; it has 3 EPROM sockets,
but only ROM2 & ROM3 are present. No reason why ROM1 should
have been removed, so I'm hoping it was an option.