On Wed, 10 Jul 2002, Manuel Polik wrote:
> >I'm missing a few timer registers, e.g. some of the disassembled games I
> >saw are using $285 (I call it TIMINT) instead of INTIM.
>
> And how would DiStella call it?
The following is taken from the memory maps I created. The full maps can
be found at http://web/ecwilkso/www/VCS_hardware
$0284 = (RIOT $06) - INTIM (read), edge detect control (write)
$0285 = (RIOT $05) - read interrupt flag (read), edge detect control (write)
PA7 of the RIOT can be used to generate an interrupt. Unfortunately, the
6507 has no interrupt inputs. So the /INT pin of the RIOT is left unconnected.
But an internal flag is still generated and can be read and cleared normally.
I haven't thought of a specific use for it yet, but I'm sure *someone* would
like to know that player 0 moved the joystick to the right (or stopped) or
pressed the paddle 0 button (or stopped) since the last check.
Maybe we can call address $285 "INTFLG"?
-Chris
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