Scanlines patch for ZZ9000 firmware - need zz9000_ps.bd from 1.13

MNT ZZ9000
1

Hi,

I’ve been working on adding parametric scanlines to the ZZ9000 firmware for AGA scandoubler output, similar to what Indivision offers. The patch is minimal and verified.

What’s been done:

video_formatter.v — 4 modifications:

  • New input port scanline_intensity [7:0]

  • Two internal registers vga_scanline_intensity and pixout_sl

  • Synchronisation on dvi_clk

  • Attenuation applied on odd lines only when vga_scale_y=1 — AGA native mode only, RTG is fully protected

mntzorro.v — 4 modifications:

  • New output port scanline_intensity_out [7:0]

  • Internal register scanline_intensity initialised to 0 (scanlines off by default)

  • Zorro register 'h08 mapped to scanline_intensity

  • Output connected to video_formatter

The logic has been verified in Vivado 2025.2 simulation — 5/5 tests pass covering AGA/RTG discrimination, intensity=0, intensity=128 and intensity=255.

An Amiga-side 68k binary ZZScanlines writes the intensity value to register 'h08 via FindConfigDev — compiled, tested and working on a real A4000 with ZZ9000.

The problem:

The firmware 1.13 GitLab repo is missing zz9000_ps.bd. I used the block design from the older GitHub master repo as a workaround, which allowed synthesis and routing to complete successfully with 0 unrouted nets — but there is a pre-existing timing violation (WNS=-1.866ns) that I suspect comes from this version mismatch, not from my patch.

What I need:

The file zz9000_ps.bd from a clean firmware 1.13 build environment, or alternatively someone with a complete 1.13 Vivado project who could compile the two patched .v files and generate a clean BOOT.bin.

I can provide the patched video_formatter.v and mntzorro.v.

Thanks

1 Like