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Convert9918 - v166


If this software is cool or useful to you, consider a small donation to the programmer! There is *no* need to pay to download and enjoy this software! But it's a lot of work and I do it in my so-called spare time, so a couple of dollars would be really appreciated! :)
(Alternately, there's my Amazon Wishlist)

Click here to download:
2 downloads this week
140 downloads total
windows.gif Download Convert9918 for Windows. (1.1 mb)  

This program can convert most modern graphics into a form compatible with the TMS9918A bitmap mode. It supports a drag-and-drop interface and handles resizing and scaling, several forms of user-configurable dithering, adjustable color selection, and more.

It also supports multi-color (64x48) mode, a dual-multicolor mode with flicker, and a half-multicolor mode that flickers multicolor with bitmap to get more colors.

Finally, it also supports two palette modes for the F18A VDP replacement - a 16-color palette mode, and a per-scanline palette mode (this mode uses most of the VDP RAM and requires the GPU to update the palette every scanline, but because it runs on the GPU the host CPU is not impacted at all!)

Sample video at

Last Updates (max 5)

  • improvement to quality of ordered dither 1 - far less color shift
  • more minor speedups
  • fix order of palette output for F18A - to fix old files, remove index 2 and insert at index 14

    Fix crash bug when saving from GUI
  • 162 and 163 were not reading the last few palette entries correctly. Delete your INI if you have any color issues.

  • Completed command line interface and improved debug output

  • code cleanup, move all functions back into one to ease updates (#ifdefs to produce speed support)
  • faster decode (20%)
  • add true ordered dither, and modified true ordered dither which balances brightness change (but more likely to produce unpleasant color shift). Old ordered is now called 'pattern'.
  • change palette back to Classic99 unscaled palette, looks better these days (only 2% difference though)
  • add INI load/save (LOAD not tested 100%... the data comes in but not all tested to make it to GUI). Save includes the palette so you can in theory change the palette now. A [default_palette] entry will always contain the default values in case you need to revert (or just delete the ini).
  • tab order is fixed
  • allows saving result as PNG (paletted) - not sure if scanline palette F18A works so disabled for now.
  • re-enabled the ColecoVision RLE cart to support the PNG entry, but it's still not fixed

  • Title:Convert9918
    Last Update:2016-10-01

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