RE: ASTEROIDS DELUXE strange problem...

From: Alex Yeckley <ayeckley_at_elektronforge.com>
Date: Mon Nov 19 2007 - 09:30:22 EST

>I can't understand where this function is implemented.

There is no single part of the circuitry that draws the text. The text is
treated like any other vectors, except that the instruction set for each
character is contained in vector ROM rather than being assembled on-the-fly
and put in the vector RAM pages. A prerequisite to successfully accessing
the vector ROM instructions after DMAGO (might be called VGGO in Ast. Dlx)
is a properly working stack and program counter, so those might be something
to suspect. Good luck...

Alex

----
ayeckley@elektronforge.com
www.elektronforge.com
---------------------------------------------------------------------------
** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
** Please direct other questions, comments, or problems to chris@westnet.com
Received on Mon Nov 19 09:30:27 2007

This archive was generated by hypermail 2.1.8 : Mon Nov 19 2007 - 09:50:00 EST