Monthly Archives: January 2017

First I have to give a big thanks to Mark McDougall who explained to me that I don’t have to have the video ram in the main 64k of addressable space the CoCo3 uses!  I should have realized this myself since working … Continue reading →

I’ve started implementing sprites and I’ve got the red ghost animating and Pac man moon walking a little across the screen.  You can’t see it from the picture below but you can see that I finally have Pac Man on … Continue reading →

Not much to report on, I’m still trying to figure out how the sprites get loaded in Pac Man and how to best implement my sprite engine with it.  While going through some more code I decided it would be … Continue reading →

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 … Continue reading →

A little more progress…  I still have to make the other coloured ghosts but at least I know where in the code it draws these ghosts so it should be relatively easy to draw the correct one at the correct … Continue reading →

I fixed up the DrawCharacter routine that now masks off the high bit of the screen address as some of the pointers were pointing to addresses in the C3D4 range which is not possible.  I also added a routine that … Continue reading →

I’ve made more progress over the last few days…  I have Pac Man text characters working and it runs as far as the test grid now all being displayed properly…  I’ve decided to not keep the original ROMS in their … Continue reading →

Today I managed to setup the palette info for the CoCo 3 to be an exact match for the Pac Man color Prom and then I converted all the existing characters and sprites to their proper colours according to the … Continue reading →

I now have the sprites converted to CoCo3 format… I’ve now converted the original 16 colours from the Pac Man Prom these are the colours that will be used for the RGB version using the info provided from this page.  I … Continue reading →