Re: Guru Meditation Exact Visual Specs

Date: Thu, 11 Aug 2016 08:06:29 +0200
Message-Id: <>
> On 2016-08-10, at 23:41, Ethan Dicks <> wrote:
> On Wed, Aug 10, 2016 at 3:44 PM,  <> 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...

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,


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


> 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 :-)

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Received on 2016-08-11 07:00:04

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