Difference between revisions of "V9938 Video Data Processor"

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Revision as of 23:23, 10 June 2019

Officially called the MSX-Video Data Processor V9938, this video chip is one of the main advantages of the Geneve 9640. The name already suggests that this VDP is typically used in MSX computer systems.

Video modes

Mouse and Lightpen support

Commands

Benchmarks

I wrote a couple of benchmark programs that run in native mode and use the clock chip for measuring the command execution times. The commands are repeated many thousand times so that in the end, an execution time in the range of several seconds up to minutes is measured; dividing by the iteration count and considering setup times, we get a good estimation of the single execution time.

This information is particularly important when using the VDP commands in time-critical situations, for instance, in games.