[comp.sys.atari.st] Running the MIDI ACIA at 500KHz

dmb@wam.umd.edu (David M. Baggett) (03/05/90)

I notice that it's possible to change the clock divider value for the
ACIAs, meaning that, in theory, one could run the MIDI port at 500K
baud.  Normally, the divider is 16: 500KHz / 16 = 31250 baud.  Setting
the divider to 1 would give a 500KHz clock = 500K baud.

Has anyone experimented with this?  My initial attempt at this causes
the machine to hang, but that might be because the OS code to handle
the interrupts is not fast enough to handle that data rate (e.g., the
buffer may be too small).

Am I re-inventing the wheel, or attempting the impossible?


Thanks all,

Dave Baggett
dmb@cscwam.umd.edu