v9958 problem - how much different sprite colors possible?

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By Grauw

Ascended (8386)

Аватар пользователя Grauw

09-03-2019, 13:23

Have you tried the YJK mode yet? It is nice for photographic images.

The YJK+YAE mode can potentially also be nice for pixel art (expanding the colour count while being able to avoid attribute clash), but is a bit difficult to draw for. I posted some thoughts here, though I’ve yet to try at length to see if it’s a usable workflow. That’s a nice thread to read btw. I posted a nice YJK video here.

By vossi

Rookie (24)

Аватар пользователя vossi

11-03-2019, 09:09

Pictures are on github.com/vossi1/cbm2-v9958-card in pictures folder!

I didnt tried the 19k colors mode till now...
First I modified the kernal to use the 9958-card (dual monitor in basic).

By vossi

Rookie (24)

Аватар пользователя vossi

11-03-2019, 09:15

By DarkSchneider

Paladin (862)

Аватар пользователя DarkSchneider

11-03-2019, 10:28

vossi wrote:
Grauw wrote:

If bits 0-2 of r#5 are not 1, it will introduce mirroring. If the colours repeat after sprite 8, this sounds like bit 0 (A7) is zero, causing it to mirror after the first 128 bytes of the table. Are you absolutely sure that r#5 is 3FH and not 3EH or 3CH?

THANKS - that was ist!!!

At first I had $3C (A9=1 correct) and I recently changed to $3F - but only in the comments and not in the real vdp-init-data-table!
Why to hell must bit 0+1 = 1 ???

Depending the mode some bits are forced to a value. Take a look at the manual:
http://map.grauw.nl/resources/video/yamaha_v9938.pdf
If not we get unexpected behaviours.

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