RetroPie forum home
    • Recent
    • Tags
    • Popular
    • Home
    • Docs
    • Register
    • Login
    Please do not post a support request without first reading and following the advice in https://retropie.org.uk/forum/topic/3/read-this-first

    Atari 8-bit emulator colour problem in Mode 9 - seen in demos. Atari800.

    Scheduled Pinned Locked Moved Help and Support
    1 Posts 1 Posters 651 Views
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • R
      RetroResolution
      last edited by

      Hi all,

      I've used the Atari800 emulator for Atari 8-bit / XL/XE emulation under RetroPie 2.x and currently 3.6.

      In all versions the colours are sometimes incorrect. I've seen this specifically in demos which use modified mode 9 graphics (natively 16 shades, 80 x 192).

      Generally the error appears as black pixels where the context requires the lightest shade of the current palette (generally as close to white as the luminance allows).

      The in-built menu has several options to control the display, including selecting PAL/NTSC, using CTIA or GTIA, changing to 'deep black' or 'vibrant' colours, etc. I've changed all of the available settings but still see the problem.

      It doesn't appear to be a simple 'off by one' or palette shift, as the issue isn't consistent, even within a single demo.

      I'll take take screen grabs later to illustrate the issue more clearly.

      Unfortunately Google has not been my friend in investigating this issue.

      Thanks in advance for any input.

      If a post has helped you, please encourage the author by up-voting via the ^ icon located in the bottom-right corner.

      RetroResolution.com - Adventures in retro gaming on original hardware and via emulation with RetroPie on the Raspberry Pi.

      1 Reply Last reply Reply Quote 0
      • First post
        Last post

      Contributions to the project are always appreciated, so if you would like to support us with a donation you can do so here.

      Hosting provided by Mythic-Beasts. See the Hosting Information page for more information.