Rairii, 3 months ago

<some looking at linux drivers and reversing of os9 drivers later, followed by memory pokes in OF>

where the base address is the second value in assigned-addresses, where OS9 detects this by lower bit of the first u32 (flags?) as 0x18:

U16LE base+0xb0 is index, then U32LE base+0xb4 is data (00rrggbb) - this is what linux uses, probably for wider device support

there's also 30-bit RGB (10:10:10) at U32LE base+0xb8, which is what OS9 uses

Rairii, 3 months ago

interesting. in OF the first 16 colours are definitely the VGA colours

not sure what the other 240 colours are

jernej__s, 3 months ago

@Rairii Can you post the palette?

Rairii, 3 months ago

@jernej__s I tried dumping the palette but I think that register is write-only.

I ended up filling the framebuffer and observing the colours appeared to be similar to the VGA ones.