5 Mar
2014
5 Mar
'14
6:38 a.m.
Well, it does have color graphcs of a sort. 64x64 4-color to 256x192
2-color.
One stopper for you may be that the output of the 6847 is 1 luminance
pin and 2 multi-level chrominance pins, pretty much tailored to drive a
MC1372 RF modulator--not RGB.
A typical system would be a 68xx series MPU, MC6883 SAM, a little DRAM,
some ROM for the MPU, and the MC1372. It's pretty much tailor-made for
a low-end TV gaming setup.
--Chuck
On 03/04/2014 06:34 PM, Kyle Owen wrote:
On Tue, Mar 4, 2014 at 6:30 PM, Chuck Guzis <cclist
at sydex.com> wrote:
On 03/04/2014 03:32 PM, Kyle Owen wrote:
Looks related to the 6845 variant, but I imagine this 6847 board has more
So it sounds like for character display, it's basically worthless. What
about for bit-mapped displays? I'm afraid I don't know much about the
6845/6847 (I've not dealt with any sort of video generators yet), but is
the 6847 not more powerful than the 6845? I seem to see more computers
using the 6845, from best I can tell.
Thanks for the info. I imagine I'll build up this card only to rarely use
it if I'm limited to uppercase text.
Kyle
graphical capability.
For what it's worth, the 6847 is intended for use with NTSC TV sets.
Character display mode is only 32x16 making 512 characters per screen.
Characters are displayed in a 5x7 pixel format. If you use the internal
ROM, you get uppercase only. For a TV, this is fine, but is otherwise
pretty limiting.