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Uploaded on Nov 14, 2010
Last weekend it was audio, this weekend it's video! I have the 6809 connected to a TMS9918A video chip.
The TMS9918A was used a number of early-'80s computers and consoles, like the ColecoVision, the TI-99/4a, and the MSX1. It's quite underpowered, and not as nice as the chips in the NES or Commodore 64, but there are plenty of them for sale on eBay.
Capabilities: 16 colors (actually, 15 plus transparent), 32 sprites, 32x24 tiles in graphics mode and 40x24 in text mode. No hardware scrolling, unfortunately.
This is a simple simulated "splash screen" that uses graphics mode II. The color cycling is achieved by changing the values in the Color Table during the vertical blanking interval.