[stella] Re: HMOVE lines

Subject: [stella] Re: HMOVE lines
From: "Eric Ball" <ericball@xxxxxxxxxxxx>
Date: Mon, 16 May 2005 22:41:35 -0400
> >And a quick explanation of the black HMOVE lines: what they are and how
to avoid them.

The HMOVE lines are an artifact of how HMOVE is implemented in the TIA.  (I
think the original TIA designers only meant to blank the graphics output,
but they accidentally did the playfield too.)

Ways of avoiding HMOVE bars:
1. Only do them offscreen, or during lines which are blank anyway.
2. Strobe it every line, whether needed or not (the Activision method).
Don't forget to do an HMCLR if you don't want things to move.
3. Strobe it at the end of the line.  This works predictably, but not
exactly the same as a normal HMOVE.  See

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