10 Aug
2012
10 Aug
'12
2:42 p.m.
On 10 Aug 2012 at 16:09, Andrew Lynch wrote:
Hi! The goal for the S-100 VGA board is to make a
register compatible
SVGA that uses commonly available VGA monitors. The application would
be an X server for the upcoming S-100 80386 CPU board. Also to
provide a greater degree of PC/XT/AT compatibility for the S-100
80286, S-100 8086, and S-100 8088 CPU boards. Presumably, an S-100
SVGA board would also be usable by non-Intel x86 CPU boards as well
but that is optional. If VGA is not viable then we need to explore
other options to provide a bitmap display for the X server.
Hi Andrew,
It's not hard to get to VGA scan frequencies without using a VGA
chip. The AT&T 6300 did it using nothing more than a modified CGA
card. Your design might be limited to 16 colors using nothing more
than a 6845 CRTC, but if the goal was a simple 640x480 display, that
might be enough.
It all depends upon what you're willing to settle for.
--Chuck