The 4•8 Card is an inexpensive 16 & 256 color video display adaptor.  It is unaccelerated and therefore has relatively slow redraw rates.

The card may be upgraded to an 8•24 Card with the addition of two Apple VRAM SIMMs.

To use a Rev A 4•8 card with a 16 inch monitor, upgrade to Rev B ROMs.  With Rev B ROMs the 16 inch monitor is supported to 8-bits (256 colors).