Re: Commodore 8296GD

From: Michał Pleban <*lists_at_michau.name*> Date: Sat, 13 Oct 2012 13:06:03 +0200 Message-ID: <50794B1B.2010704@michau.name> · lists_at_michau.name

> I have yet to figure out the correct way to switch on the display mode -
> apparently the CRTC initialization sequence I found earlier is not
> enough. I will keep looking in the ROM.

OK, this is actually not true. I tried initializing the CRTC in a BASIC
program which gave me strange results. But when we perform directly a
SYS 35859 (which changes the five CRTC registers I wrote about before),
the graphics display is correctly turned on. So the suspicion was
correct - writing #$02 into CRTC register #$0C should turn on the
graphics display.

I think these are enough information to re-implement the HRE in VICE -
as it turns out, the board usage is pretty straightforward. I will try
to post ROMs on Zimmers later today.

Regards,
Michau.

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