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From: cem@intelca.UUCP (Chuck McManis)
Newsgroups: net.micro.cpm
Subject: Re: Help needed with 8251 USART
Message-ID: <163@intelca.UUCP>
Date: Fri, 3-Jan-86 17:15:10 EST
Article-I.D.: intelca.163
Posted: Fri Jan  3 17:15:10 1986
Date-Received: Sun, 5-Jan-86 01:18:26 EST
References: <1098@brl-tgr.ARPA>
Organization: Intel, Santa Clara, Ca.
Lines: 23

> Does anyone out there have any experiece programming the 8251 USART?  I
> am using a Royal Alphatronic PC with CP/M 2.2, and want to be able to
> set and change the baud rate.  I have the data sheets for the 8251, and 
> through much experimentation, I am able to change the baudrate to suit
> my needs.  Unfortunatly, as soon as I try to send data out the port,
> the chip locks up.  Data coming in works fine.  Anyone know anything
> about this?  I can send you the code that I am using if you think
> that you can help me out...
> 
>                                Thanks...
>                                 Mike Spitzer
>                                 mjs@purdue-ecn
>                                 [decvax,ucbvax,ihnp4,inuxc]!pur-ee!mjs

Make sure the CTS (clear to send) line is either disabled or tied high.

--Chuck

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