Zilog z80 to Motorola 6809 Transcode – Part 010 – Fixed IRQ interfering with character rendering

Well I figured out the problem with the characters not being displayed correctly.  It was a problem with the Interrupt.  While in regular mode the code was displaying the text characters and at the same time the IRQ would print CREDITS 0 over and over and if they hit at the same time the IRQ changed some screen pointers and blamo crappy text.

With the text problem fixed I also battled the different coloured ghosts and it looks pretty cool now.

screen-shot-2017-01-17-at-2-56-04-pm

The next part of the attract mode is Pac man moving across the screen being chased by the ghosts.  This is done with sprites and it’s the next thing I will be working on…

See you in the next post…

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