Re: Guru Meditation Exact Visual Specs

From: silverdr_at_wfmh.org.pl
Date: Thu, 11 Aug 2016 08:06:29 +0200
Message-Id: <0A09D78E-4AE5-433C-903C-ED388806E0A9@wfmh.org.pl>
> On 2016-08-10, at 23:41, Ethan Dicks <ethan.dicks@gmail.com> wrote:
> 
> On Wed, Aug 10, 2016 at 3:44 PM,  <silverdr@wfmh.org.pl> wrote:
>> Do we know the exact visual specs of the Guru (and the "recoverable" counterpart)?
>> 
>> Especially:
>> 
>> - exact flash timings
>> - exact colour values
>> - exact dimensions
>> 
>> In the worst case, I guess it should be possible to analyse those if not from ROM disassembly (which would be the best option) then at least from some uae screen dumps/recordings. But maybe somebody has already analysed those in details?
> 
> Starting from here...
> 
> http://wandel.ca/homepage/execdis/exec_disassembly.txt

I know this one. But... 

> From here... one would need to dig into DisplayAlert() for details.

... DisplayAlert (AFAIR) sits in intuition, not in exec. And I haven't found that one.

> If anyone happens to have any version of source for intuition.library,

Exactly.

> start reading at DisplayAlert(), but at least there's some stuff from
> exec/Alert() to show what gets fed into it.

True.

> I remember knowing that stuff off the top of my head 25 years ago, but
> ISTR there's some details in the RKMs based on specific symbol names
> used by the ROM code.  From ancient memories, once you know you are
> going to be throwing up a guru meditation, the code instantiates a
> 640x40 (non-interlaced) 1-bit bitplane and sets the colors to red and
> black and drops all front Intuition screens down "the right amount" (a
> named constant in the RKMs, I'm pretty sure), but I don't recall the
> precise thickness of the framing box.  The blink is somewhere around
> 1Hz or 0.5Hz, but I couldn't say if it's some precise divide of the
> video clock that's approx 1Hz or so (I've never run a PAL Amiga, for
> example, and I don't know how they are measuring time - with VBIs or
> with a CIA timer or what).
> 
> So...

So - we look further :-)
-- 
SD!


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