Indivision AGA MK1

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Indivision AGA 4000D/CD32 Flickerfixer for Amiga 4000 and CD32
Indivision AGA 1200 Flickerfixer for Amiga 1200 Computers

Flickerfixer for Amiga

During the 1980s, it was common use to build computers in a way that they can output their picture on a TV set. This was done in order to reduce the overall system cost for the user. TV sets work with lower frequencies compared to today's monitors, therefore the picture flickers. A flickerfixer (aka de-interlacer) converts the signal in a way that a modern VGA monitor or TFT-display can be used. The name flickerfixer was mainly created because the problem of a flickering picture is solved.

The first flickerfixers for the Amiga have already been available since the beginning of the 1990s. Since that time, all flickerfixers have been using the same principle: The picture frequency was doubled. This is not enough for most modern VGA monitors and TFT displays, as the picture of a computer with PAL standard was only displayed at slightly less than 50 Hz. Most monitors require 60 Hz or more these days.

Indivision AGA goes a new path. As the name suggests, it's a flickerfixer that is very closely tied to the AGA chipset. This could only be achieved by putting the flickerfixer inside of the computer. The product is mounted over the video chip "Lisa". The VGA display is connected directly to the flickerfixer. Further connections are not necessary.

Indivision AGA's most notable features are:

  • 24 Bit colour resolution in all screenmodes
  • support for super hires modes
  • Highgfx support up to 1024x768 pixels
  • all screenmodes can be displayed at 60 Hz or more
  • no adjustments necessary

Two options have been added for retro-gaming enthusiasts that allow a step-by-step approximation to the display of an old TV set: Vertical synchronisation allows reducing the output frequency down to 49.9 Hz, which will eliminate tearing effects. In addition to that, a scanline emulation can be switched on. This will simulate the dark lines between the scanlines of a TV screen.



Pinout of the IDC-VGA cable

IDC pin# VGA pin# Signal name
1 1 Analogue red
2 6 Analogue GND
3 2 Analogue green
4 7 Analogue GND
5 3 Analogue blue
6 8 Analogue GND
7 10+5+shield Digital GND
8 13 HSync
9 14 VSync
10 4 Reserved, not connected.
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