🚀 go-pugleaf

>Bits 0 and 1 of the Control Register on the MIDI 6850 chip control a
>"divider" for the input clock, determining the baud rate.  The MIDI sets
>these bits to 01, meaning divide the clock signal by 16.  The clock to
>the 6850 is 500 Khz, which gives us the MIDI speed of 31250 bps.
>
>If you reprogram these bits with 00, it tells the chip not to divide the
>clock, giving you a clock of 500 Khz, which is adequate for a simple,
>small network (like AppleTalk).

Unfortunately, there is an opto-isolator in the circuit, and unless Atari
have been extremely generous, I doubt very much that this part will be
capable of running any faster than the original specification called for
(i.e. 30k-ish).

I don't think that you can simply bump up the clock frequency in order to
improve the networking performance of the MIDI port.

Aled Morris
systems programmer

    mail: awm@doc.ic.ac.uk    |    Department of Computing
    uucp: ..!ukc!icdoc!awm    |    Imperial College
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