[Oberon] paint.mod - support for colours

[Tomas Kral]

Hi,

Still thinking about Oberon-FPGA colours, while I am no expert on
u-electrocnics.

What if the resolution is decreased to keep the same memory buffer, and
perhaps make the bigger point size then (= twin, quad pixels). I am led
to believe this would be similar to ATARI ST / Sinclair QL, the higher
resolution the fewer colours, and vice versa? Or am I thinking of
something silly and complicated?

In Pepino-Oberon VID file, there is a change from 3-bit to 8-bit video,
does this mean that H/W already support more colours?

Many thanks.
Tomas  
-- 
Tomas Kral <thomas.kral at email.cz>

On Mon, 2016-03-28 at 13:24 -0700, Magnus Karlsson wrote:
> Also, the video circuit is stalling the processor when it needs to 
> access memory.  Today with 1 bit/pixel it is stalling the processor 
> 9.375% of the time.
> If you adapt the hardware to say 4 bits/pixel then it would stall the 
> processor 37.5% of the time.
> 
> Magnus
> 
> On 3/28/2016 12:13 PM, Jörg Straube wrote:
> > Tom
> > Having more than two colors needs at least the following
> > - adapt the Verilog code VID.v
> > - adapt Display.Mod
> >
> > For 4 colours, you obviously need double the video memory than today (today= 98304 byte = 9.3% of total memory)
> >
> > I think for a colour display it would be best to have more than 1 MB of memory.
> >
> > Jörg
> >
> >
> >
> > Gruss. Jörg
> >> Am 28.03.2016 um 20:45 schrieb Tomas Kral <thomas.kral at email.cz>:
> >>
> >> Hi,
> >>
> >> Thank you, I would like to try on Oberon FPGA Station.
> >>
> >> I am also interested in the original pictures and Paint.Tool. Not sure
> >> if these are preserved somewhere?
> >>
> >> Grapes.Pict Eschew.Pict New.Pict Clown.Pict Clown16.Pict
> >> Paint.Tool
> >>
> >> I am led to believe FPGA is currently configured for two-colour Display
> >> buffer, it would be therefore interesting to experiment with more
> >> colours, if at all could be supported by the chip.
> >>
> >> Many thanks so far.
> >>
> >>
> >> -- 
> >> Tomas Kral <thomas.kral at email.cz>
> >>
> >>> On Fri, 2016-03-25 at 12:48 +0100, scrutinizer wrote:
> >>> paint.mod attached
> >>> let me know if you need some sample .pict files
> >>>
> >>>> Date: Thu, 24 Mar 2016 21:26:47 +0100
> >>>> From: Tomas Kral <thomas.kral at email.cz>
> >>>> To: oberon at lists.inf.ethz.ch
> >>>> Subject: [Oberon] Oberon Paint.Mod
> >>>>
> >>>> Hi,
> >>>>
> >>>> I am curious about drawing programs for Oberon system as I am reading
> >>>> PO.Applications chapter, describing Draw.Tool implementation.
> >>>>
> >>>> I have also seen a Clown picture at
> >>>> https://en.wikipedia.org/wiki/Oberon_%28operating_system%29
> >>>>
> >>>> It shows Paint.Tool commands apparently coming from a Paint.Mod
> >>>>
> >>>> Paint.Mod does not seem part of Oberon System, I am just curious where
> >>>> it originates?
> >>>>
> >>>> Cheers Tom
> >>> --
> >>> Oberon at lists.inf.ethz.ch mailing list for ETH Oberon and related systems
> >>> https://lists.inf.ethz.ch/mailman/listinfo/oberon
> >> --
> >> Oberon at lists.inf.ethz.ch mailing list for ETH Oberon and related systems
> >> https://lists.inf.ethz.ch/mailman/listinfo/oberon
> > --
> > Oberon at lists.inf.ethz.ch mailing list for ETH Oberon and related systems
> > https://lists.inf.ethz.ch/mailman/listinfo/oberon
> 
> --
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