Scandoubler Pixel Colour Channel Shifted

Hi There,

Separate to my previous post, I have problem with the output from the scandoubler on my A2000. The red and perhaps blue+green colour channels appear offset with each other. This produces a colourful ghosting effect which is perhaps best described with an image:

I have this effect on two different A2000 motherboards (both Rev 6). What could be the cause of this and how could I solve this?

Many thanks!

  • Amiga model: A2000
  • 680x0 CPU: 68080/68000
  • RAM Configuration: 1 Mb CHIP/128Mb Fast
  • Kickstart, AmigaOS Versions: OS3.1
  • ZZ9000 Firmware version: 1.8
  • ZZ9000 Driver version: N/A (problem observable in early boot menu)
  • Monitor model: Various Samsung monitors
  • Other Zorro cards: None

I probably should have mentioned that I have an R2 board and the fix (drilling the hole at the specified place) has been done and the voltage is correct.

So I spoke to the guys on IRC regarding this problem. It seems like my denise chip needed some different “phase shift”. The user _Bnu was able to produce a firmware that worked with my denise chip and I all colours displaying correctly now…