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For Testers: CGA/Tandy/PCJr palette patch

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First post, by h-a-l-9000

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Changes:
- implement Tandy special 4-color palette handling
- remove 3d8/3d9 from PCJr mode (PCJr didn't have it)
- update INT10 palette functions accordingly
- add a level of indirection to Tandy and PCjr palette deconding to fix video recording with on-screen palette changes
- enable line-by-line emulation for Tandy too
- machine-specific implementation of the color when display is disabled (vgaonly too)
- enable the light pen stub on all machines that it is documented for
- mask off a bank-selection bit that is not used under a specific circumstance

The results I've seen/worked forward to:
- Alley Cat palette on PCJr
- Gauntlet palette on Tandy
- Ghostbusters palette on Tandy, as well as video recording, and Tandy was changed to support line-by-line drawing
- Pirates! blue background on the map

As the modification is quite extensive it would be good if interested people would test CGA/PCJr/Tandy games for regressions. I'm attaching the patch (against r3637) and a Windows build.

Attachments

  • Filename
    cga_pcjr_tandy_palette2.diff
    File size
    21.38 KiB
    Downloads
    297 downloads
    File license
    Fair use/fair dealing exception
  • Filename
    DOSBox_PAL.zip
    File size
    1.2 MiB
    Downloads
    437 downloads
    File license
    Fair use/fair dealing exception

1+1=10

Reply 1 of 8, by Riyune

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I recall an EA game from 1988, Adventure Construction Set, that allowed a choice of any 4 of the 16 CGA colors when running on a Tandy. Would this be something to test this patch?

Also I was wondering if it would be difficult to enable CGA palette shifting in all CGA games, maybe with a small TSR program. Programmers?

Jesus loves you, unless you have tatoos. Then you are going to hell.

Reply 2 of 8, by h-a-l-9000

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Riyune wrote:

I recall an EA game from 1988, Adventure Construction Set, that allowed a choice of any 4 of the 16 CGA colors when running on a Tandy. Would this be something to test this patch?

Yes, sounds like a test case.

1+1=10

Reply 5 of 8, by Jamesapp

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Hello,
I am going through a book, written for Tandy computers. It is a gw-basic book, I have gw-basic 3.22 on my macbookpro laptop. I use it with dosbox.

Would this patch help me, some of the examples in the book don't match my computer, screens, color, palettes etc.

How do I install the patch?

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