[Coco] Orchestra 90cc High Speed Mode

[Rogelio Perea]

Well, I had been missing out for years. I had read about the O90cc high
speed mode a long time ago but I only tried it on the startup orange screen
banner - thought that would be enough, thanks Art for jolting my neurons to
do the Shift-Enter when PLAYING the musical piece... there it was the crazy
out of control video but a noticeable enhanced audio playback as well, less
aliasing on the high frequencies.

So that is the secret: SHIFT+ENTER on the orange startup banner, load your
song, score and upon issuing the PLAY command again: SHIFT+ENTER.

When the playback ends or the user interrupts it the screen goes back to
its normal self

:-)


-- RP


On Mon, Dec 10, 2012 at 7:40 PM, Bill Pierce <ooogalapasooo at aol.com> wrote:

>
> High Speed Orch90?
> Wow, didn' know about that one. I'll remember that when I get back to
> writing the Orch90 player for Sound Chaser. I had to take a break from
> working on it so I could get some other projects done but will continue
> after the first of the year.
> I was trying to disassemble the Orch90 rom but according to Jon Bokleman's
> email I recieved a while back, the code was writen on a Model I and cross
> assembled so it's all over the place. Instead, I've opted to write my own
> code based on the knowledge of how the original works. Which is basically
> like Musica but more in line with the way Lyra does TV play in the last
> incarnations of the program. The major difference is that both Lyra and
> Musica decode the music as they play, giving them a grainier sound. Orch90
> decodes (scores) the music first into playable code then plays. The other
> major difference being 2 8-bit dacs as opposed to 1 6-bit dac. Sweeeet.
> My "playmus2" player for Sound Chaser will play Musica files in full
> stereo through the Orch90 (real or VCC emulated). I think since it runs in
> Level 2 OS9, the high speed is already in effect. I know it sounds awsome.
>
> Bill
>
> Music from the Tandy/Radio Shack Color Computer 2 & 3
> https://sites.google.com/site/dabarnstudio/
> Bill Pierce
> ooogalapasooo at aol.com
>
>
>
>
> -----Original Message-----
> From: Rogelio Perea <os9dude at gmail.com>
> To: coco <coco at maltedmedia.com>
> Sent: Mon, Dec 10, 2012 6:41 pm
> Subject: [Coco] Orchestra 90cc High Speed Mode
>
>
> >From an old Delphi conversation:
>
> - - - - - - - -
>
> 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
> - - - - - - - -
>
> 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
>
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