Re: [stella] tutorial progress

Subject: Re: [stella] tutorial progress
From: Glenn Saunders <cybpunks2@xxxxxxxxxxxxx>
Date: Thu, 27 Jun 2002 22:54:34 -0700
You have 22 + 53 which is 75 cycles, not 76.

Wouldn't it be 54 cycles?

I also think it might be good to have an alternate diagram that is more WYSIWYG, in other words, superimposed onto a television screen. The reason being that on a real TV, horizontal blank expresses itself as being horizontal overscan on both the left and right side of the screen. As far as 2600 coding goes, it looks like all the overscan is on the left which isn't true in a visual sense.

Nobody has ever really made any detailed charts that show where the beam really is and when.

For instance, in a typical program, the beam is not quite at the right hand side when you issue a WSYNC. So to visualize this you could show a staggered set of scanlines to indicate the timing for when each scanline's code ends and the TIA's WSYNC function kicks in.

Also, you should visually chart out safe zones for when it's safe to store and rewrite each of the playfield registers in both reflected and repeated modes.

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