Zach's Projects

That's a really nice diagram, Zach.

 

It might be nice to add arrows (or something) for when graphics writes need to happen. E.g., I'm pretty sure that you need at least a cycle lead time when writing to PF0, PF1, or PF2. In other words, writing to PF1 at cycle 28 will be too late; the write to PF1 needs to happen by cycle 27. This also applies to GRP0 and GRP1.

 

That doesn't apply to color writes, as far as I've been able to tell.

What I've done in the past is to put it in a simple spreadsheet which then makes it easier to shift sections of code around.

What I've done in the past is to put it in a simple spreadsheet which then makes it easier to shift sections of code around.

 

Once upon a time I used a Macintosh paint program to draw up a timing sheet with 76 cycles across, and with the playfield pixels marked. I may somewhere have a paper timing diagram from my first kernel which I did back in 1995 or thereabouts.

There is another nice timing diagram in this thread on the newbies forum.

 

Chris

I like your diagram. I like seeing the tools and techniques other people come up with to solve similar problems. Its a great way to see a problem from a new angle. For comparison, I posted my own timing diagram on the stella mailing list a while ago. Here's the link:

 

http://www.biglist.com/lists/stella/archiv...2/msg00180.html

 

Cheers!