Re: [stella] TIA internals

Subject: Re: [stella] TIA internals
From: Mark De Smet <de-smet@xxxxxxxxxxxxxxx>
Date: Wed, 9 Jan 2002 22:37:49 -0600 (CST)
> I finally printed myself some original size (2'x3') TIA schematics at Kinko's 
> last week.  I've since spent a few days looking over them.  I'm starting to 
> understand a lot of what's going on in there now, and now I'm wondering if it's 
> worth putting together a "Guide to the TIA schematics" writeup.  Sort of a 

It's a reasonable idea.  I wonder however how useful it would be to
people.  It would only really be useful to those technically inclined to
digital logic.

If you decide to do this, I am interested it taking part.  I've figured
out the overview of just about the entire thing; and a fair chunk of the
gritty details.

My favorite parts are the playfield registers, and the divide by 3

> description of how the various uglier bits the polynomial counter 
> compares and the HMOVE stuff.  Like where those funny lines on the left 
> edge come from. :)

Kinda fun, ain't it?

> I've also discovered "TkGate", a digital logic simulator that runs on
> Linux.  I've been successful at putting some of the pieces in there to
> see how they work.

Cool.  Does it support the persistant effects of the MOS transistors?  Or
did you mimic that with some latches?

> Finally, I really think recreating a new TIA in a programmable logic
> chip really would make a lovely project for an EE student.

Quite so.  Care to take it on?


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