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- Path: sparky!uunet!dtix!darwin.sura.net!spool.mu.edu!olivea!hal.com!darkstar.UCSC.EDU!aaronf
- From: aaronf@cse.ucsc.edu (Aaron T. Ferrucci)
- Newsgroups: comp.sys.sgi
- Subject: Re: External sync on serial ports
- Keywords: external sync
- Message-ID: <18lv3jINN96v@darkstar.UCSC.EDU>
- Date: 9 Sep 92 22:50:27 GMT
- References: <18ir41INNedj@darkstar.UCSC.EDU> <pjp3rf4@rhyolite.wpd.sgi.com>
- Organization: University of California, Santa Cruz (CE/CIS Boards)
- Lines: 32
- NNTP-Posting-Host: arapaho.ucsc.edu
-
- ]] I am interested in generating the odd-ball baud rate of
- ]] 31.25 kHz for interfacing a 4d60 to MIDI devices. There's some
- ]] suggestion that it might be possible to use an external clock, for
- ]] example in the man page for stty. Is this actually possible? Thanks
- ]] to any and all who supply clues.
- ]
- ]
- ]The standard serial I/O ports for 4D/60's and other machines besides
- ]Indigos either use UART's and incapable of using external clocks or do
- ]not have a signal connected to the stupid DB-9 connector.
- ]
- ]There is a sync board used with the IBM and x.25 products, but
- ]you wouldn't want to buy it just for MIDI.
- ]
- ]The Indigo can talk to MIDI devices on its din-8 connectors.
- ]
- ]
- ]Vernon Schryver, vjs@sgi.com
-
- Well, if it's impossible to generate 31.25 kbaud, what about a baud
- rate converter? I have in mind a simple circuit I could design which
- would convert incoming MIDI data to 38.4 kbaud, and convert MIDI data
- coming out of the computer to 31.25 kbaud. The circuit would
- consist of 3 chips and a few analog components. It could be used with
- any computer which can run a serial port at 38.4 kbaud with hardware
- flowcontrol.
-
- Email me if you are interested in this idea (and also if it's already
- been implemented!). I could possibly produce a small number of boards
- for a small profit.
-
- -Aaron
-