Scali wrote:In fact, we have even encountered some later IBM CGA cards, which use a HD6845 chip rather than the original Motorola 6845, which also does not work properly (although we can probably change some settings in our code to fix that).
So you really REALLY need an early IBM PC (5150/5155/5160) and early IBM CGA card to run the demo as intended.
The capture was from a 1987 IBM 5160 with an early IBM CGA card with original Motorola 6845.
Great Hierophant wrote:My "early" CGA card did not have a jumpy picture and it has an MC6845.
mr_bigmouth_502 wrote:That was a crazy demo, although the last part where they drew those polygonal objects didn't seem that impressive for the 5150. I could swear there have been a number of games made back in the 80s for that thing that pushed more polygons at once, albeit probably at a lower framerate.
MobyGamer wrote:The polygons seem to get 100% love or 100% hate. I'll say this: Showing large polys without any double-buffering at that framerate must mean something fishy is going on. It is -- only the deltas that need to be drawn are calculated and put into video RAM.
Tell that to CPC users who have to bother with 3 variants of the 6845 + 2 licensed clonesScali wrote:Great Hierophant wrote:My "early" CGA card did not have a jumpy picture and it has an MC6845.
Yes, it really DOES work on the right hardware
We were not aware of the HD6845 issues, since apparently all the cards we used during development were using MC6845s.
shock__ wrote:Tell that to CPC users who have to bother with 3 variants of the 6845 + 2 licensed clones
HSync pulse width in characters (0 means 16 on some CRTC), should always be more than 8; VSync width in scan-lines. (0 means 16 on some CRTC. Not present on all CRTCs, fixed to 16 lines on these)
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