26 Oct
2013
26 Oct
'13
6:32 p.m.
On Sat, 26 Oct 2013, Fred Cisin wrote:
CGA was 640x200 pixels, so the 80x25 characters were
5x7, within 8x8 box.
MDA was 720x348 pixels, so the 80x25 pixels were 9x12.
CORRECTION: MDA (and hercules) was 720 x 350, NOT 348 (348 was
macintosh). MDA was text only, without pixel addressable graphics
capability - that was what Hercules exploited.
The Hercules card was a clone of the MDA, with the addition of pixel
addressable graphics. But Hercules was itself widely copied, and had lots
of nasty advertising around that, including at least one ad implying that
imitations of Hercules' board (which was unarguably a [slightly improved]
imitation of IBM's board) would destroy the computer and monitor.