Date   : Mon, 28 May 1984 08:07:00 MDT (Mon)
From   : Ron Fowler <RFOWLER@Simtel20.ARPA>
Subject: [RFOWLER: MEX question]

Date: Sunday, 27 May 1984  15:42-MDT
From: Ron Fowler <RFOWLER>
To:   Stephen C. Hill <STEVEH at Mit-Mc.ARPA>
cc:   RFOWLER
Re:   MEX question

Somewhere in the documentation, I mentioned that phone-lib baud rates
require special support in the overlay (perhaps it was in the PMMI
overlay that I mentioned that).  There is a vector in the overlay
table called (in M7 parlance) JMP$NEWBAUD; MDM used it only in the
PMMI overlay, most others simply did a RET.  This routine gets a buad
code (0-9) in the A register, and must validate and set the rate
accordingly (also updating MSPEED if the code is one the overlay can
support).  

For more details, look at the code in MXO-PM1x.ASM, which has this
fully implemented.                     --Ron