BlowUp ... Something special

Hardware, coding, music, graphic and various applications

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Atari Super Hero
Atari Super Hero
Posts: 713
Joined: Thu Nov 13, 2003 4:09 am
Location: Top of the World - Australia

BlowUp ... Something special

Postby karlm » Sun Feb 13, 2005 9:12 pm

Hi peeps!

All that talk of the Falcon VGA adapter modification got me thinking about BlowUP so I thought I'd track down Georg Acher, the guy who made it ... and guess what ...

You have luck :-) I've made the sources now available. You can download them
under ... ources.tgz

They were developed with Pure-C. They contain a lot of german comments (some
of them really nonsense ;-), but they should be understandable with a little
bit bablefish...

Regarding the hardware: The Hard 1 was a simple 50MHz quarz oscillator
feeding the pixel clock input. The only trick was a resistor from the clock
signal to ground (depends on the oscillator, about 120 to 220 ohms, if its
wrong you see white or black streaks).

The Hard 2 had a variable pixel clock (33-55MHz), but contained no "real"
PLL. It was a VCO (NE564), its control voltage was generated by a CMOS
sample and hold circuit (CD4007) and a large foil capacitor. The paddle port
provided the up/down control of the voltage. There was a continous software
feedback loop measuring the vertical blank frequency and adjusting the
voltage accordingly. Sounds like an ugly hack, was ugly, but worked quite
good ;-) The only trick was to stabilize the 5V from the Falcon, which was
done by a TL497 switch converter and a 78L05 linear regulator.

Georg Acher,
"Oh no, not again !" The bowl of petunias


Now wasn't that nice of him!?

Maybe someone wants do draw up the schematics of the hardware!?



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Atari Super Hero
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Posts: 837
Joined: Mon Sep 08, 2003 3:50 pm
Location: Hannover, Germany

Postby jens » Mon Feb 14, 2005 2:14 pm

Well - the BlowUp was integrated into the FX-card and also available in a standalone version.
I heard the standalone is a nice thing whereas I had no big interest to build up configs for the version which accompanied the FX.
The guy who owned my falcon until I got it used to use it, but his setups were made for his monitor, not for mine.
Now I'm using the Videl Inside software which provides me with up to 800x608 in 256 colours. I just use 768x576 as that speeds up overall performance a bit as it does not need so much bus capacity I think.
Greetings, Jens

Falcon030 - TT030 - Mega/STe - 1040 STf - 520 ST+ - ST-Book - Milan 060

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