There is a compromise available, if one were to really want to proceed with
a project like this.  The video timing and generation would have to be
written in assembler.  Once that is under control, C can then be used to
layer "features" on top.  Things such as the input of text, fomatting,
scrolling, keeping score, managing clocks, and so on.

Using a faster processor, more of the timing generator could be moved over
C.

Somewhat less adventurous approaches would substitute hardware in place of
the "must be done in assembler" parts.

Barry
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