Ron Natalie <ron@BRL-TGR.ARPA> (02/11/85)
I've seen adds for midi ports for McIntoshes. Since McIntoshes only interface though their balsted serial ports, you might be able to adapt that interface for your own needs. -Ron
ron@BRL-TGR.ARPA (Ron Natalie) (02/21/85)
Guess again chucko. 32000 bits/sec <=> 32000 baud (as baud is used in lay terminology). You don't really think your 4800 baud terminal is outputing 4800 characters per second do you? -Ron
RMS.G.HNIJ%MIT-OZ@MIT-MC.ARPA (John S. Labovitz) (02/22/85)
> From: dave%rocksvax.uucp@BRL-TGR.ARPA > Date: 20 Feb 85 16:35:00 GMT > > Typical asynchronous formats use 10 bauds to transmit 8 bits. (1 start > bit, 8 data, 1 stop bit) Assuming that the thing is async, I believe > it is, then, 30000/8= 3750 bytes/sec which would be sent at a rate of > 37500 baud. Most of the UART chips require a 16x clock to synchronize > the data to its internal shift register so the chip requires a 600Khz > clock. Most old UARTS just make this. I believe this was the reason > they picked that rate and the crystal for the oscillator is an off the > shelf value. > > Dave > > arpa: Sewhuk.HENR@Xerox.ARPA > uucp: {allegra,rochester,amd,sunybcs}!rocksvax!dave actually, midi uses 31.25 kbps. it comes out to a 500khz clock rate if used at X16. unfortunately, my cp/m box has a crystal the correct frequency to generate all the `standard' baud rates (300, 1200, etc), but i can't get it to do anything else. i wish i'd kept my heath h89 -- it had an 8250, and could do any rate (up to 56kpbs or so). @hnij@ -------
MRees.wbst@XEROX.ARPA (03/01/85)
Watch this space. The prototype MIDI<-->RS232 box is running. MRees.wbst@Xerox.arpa