[Coco] Orchestra 90cc High Speed Mode

[Rogelio Perea]

>From an old Delphi conversation:

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10024 1JUL86-1959 Hardware Hacking
RE: POKE65497,0 (Re: Msg 10012)
From: ARTFLEXSER To: MARTYGOODMAN

Actually, that double-speed mode does work pretty nicely with the
Orchestra-90 rompack, which has an undocumented command (shift-enter) for
throwing it into that mode. So long as the code being executed is not in a
tight loop (which can be planned for by the designer), the all-ram
double-speed mode does a nice job in enhancing the music quality. Though,
of course, not every CoCo will run properly with it. (Memory will get
refreshed okay in the course of executing instructions
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Always been intrigued about the details on this high speed mode, now that I
have been playing with the O90cc pak for the Holidays music the thought
came up again: what exactly does that SHIFT-ENTER sequence engage when done
at the pak's boot screen? is it supposed to throw a CoCo 1/2 into the all
ram double speed?

It apparently does nothing in my F board setup... need to record and play
back head to head two music renditions to see if any HF aliasing smooths
out or not when in that mode.

>From Basic the F board's video goes bonkers as expected on the POKE&HFFD9,0


-- RP