HAM/HAM8 Programming Documents needed...

[fatman2021]

Where can I find HAM/HAM8 Programming documents?

[Varthall]

Have you tried searching on aminet?

Varthall

[Thomas]

HAM6 is 6 bitplanes deep and HAM8 is 8 bitplanes deep. The upper two bits select the action:

0 -> the lower bits point to the palette
1 -> the lower bits set the red portion
2 -> the lower bits set the green portion
3 -> the lower bits set the blue portion.

As you can see, with HAM8 only 6 bits are available to modify colors, so you don't get real truecolor but only 262144 different colors (plus 64 from the palette). With HAM6 all 4096 colors can be reached.

What do you want to know more ?

Bye,
Thomas

[PiR]

I'm not sure, but I think that 'selecting bitplans' were changed from the upper ones in HAM to lower ones in HAM8.

[Karlos]

There were some interesting things done with HAM8 that worked by changing some of the 64 palette entries for each scanline using the copper (IIRC).

With this mechanism, millions of colours were possible in screen (not quite true colour but not far off).

[Thomas]

I'm not sure, but I think that 'selecting bitplans' were changed from the upper ones in HAM to lower ones in HAM8.

No.

Bye,
Thomas