Path: utzoo!utgpu!watmath!att!chinet!mcdchg!ddsw1!ddsw1!point!wek
From: wek@point.UUCP (Bill Kuykendall)
Newsgroups: comp.sys.ibm.pc
Subject: Re: 16450/16550 UART question
Message-ID: <[1499.2]comp.ibmpc;1@point.UUCP>
Date: 16 Aug 89 13:00:04 GMT
References: <89081106353440@masnet.uucp> <123@fiver.UUCP>
Lines: 24

>> The 16550A is a teriffic UART, It will replace the 16450 or 82450 and
>> give you a 6K buffer that is supported by Telix. It has allowed my USR
>             ^^^ This is a 16 byte FIFO.
>
>> HST 14.4 to work properly @ 38400bps without errors.
>                              ^^^^^^^
>              If this is a V32 modem I doubt that this is the real
>              bps effective out the modem. Most likely it's the 
>              throughput of the modem measured with compression done
>              on the data. Just think if your sending compressed data
>              to the modem already. If you really want to spec a modem
>              modem fairly state:
>              cps/sec uncompressed data
>              cps/sec compressed data.
>              
Good point, but he wasn't spec'ing the modem, he was spec'ing the uart.  In
fairness, neither had 38.4k throughput though.  The HST 14.4 has an
effective throughput of about 26k with max compression.  Your mileage will
vary.  The HST is not V.32 standard.  USRobotics makes a V.32, and a Dual
Standard with V.32 *and* HST 14.4, but word has it that they're not ready for
prime time yet.

Bill Kuykendall
...ddsw1!point!wek