There are a bunch of issues surrounding the older GPIB cards. You'd think you could get 488-1 functionality from 488.1 cards. But you'd be optimistic. It's as though NI purposely obsoleted them thru hardware and sw changes... Unless you get one of the 488-2 cards, you'll be stuck in dos mode.
I've had success bit banging a card with a 9914 chip. Never tried the ones with the NEC chip.
The cheapest solution for plots is a GPIB thinkjet printer. mike