linuxaudio.org

On Sunday 04 July 2010, Gordon JC Pearce wrote:

quoted text
>On Sun, 2010-07-04 at 22:16 +0100, Dan Mills wrote:

>> You could probably hack a multi serial port card to do multiple midi

>> ports (Change the rock to give a suitable divider for 31250 baud

>> (4MHz?), add current loop interfaces)...

>

>Been there, done that - when I was a penniless dole-scrounging scruffy

>university drop-out living on a farm in the middle of nowhere, I decided

>I needed a MIDI sequencer.  So, I modified an old serial card with a

>4MHz crystal which divides to 31250 baud, and wrote a simple

>tracker-style sequencer in a mixture of C and assembler on DOS.  It

>worked, kind of.  If you wanted to do anything really wild like change

>the tempo you needed to recompile.

>

>Gordon MM0YEQ

>

As for the serial card with a different crystal, BTDT, on a TRS-80 Color

Computer 3.  Not only that, but the software, Ultimuse-III, written by Mike

Knudsen could handle the serial card and the bitbanger at the same time, so

I actually had 2 ports and drove two different midi keyboards each with

their own midi voice assignments.  This on a machine with 60 ticks/second

IRQ's for a clock.  And neither port had any extra added buffers, it Just

Worked(TM).

--

Cheers, Gene

"There are four boxes to be used in defense of liberty:

 soap, ballot, jury, and ammo. Please use in that order."

-Ed Howdershelt (Author)

Any sufficiently advanced technology is indistinguishable from a rigged

demo.

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