Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!uwm.edu!ogicse!emory!hubcap!ncrcae!sauron!wescott
From: wescott@Columbia.NCR.COM (Mike Wescott)
Newsgroups: comp.sys.ncr
Subject: Re: Telebit modem on ttya or ttyXX ???
Keywords: tower telebit modem ttya
Message-ID: <2032@sauron.Columbia.NCR.COM>
Date: 4 Mar 90 23:23:38 GMT
References: <500@gpstwr.UUCP>
Sender: news@sauron.Columbia.NCR.COM
Reply-To: wescott@micky.Columbia.NCR.COM (Mike Wescott)
Organization: E&M-Columbia, NCR Corp, W Columbia, SC
Lines: 18

In article <500@gpstwr.UUCP> merv@gpstwr.UUCP (Merv Graham) writes:
> We are now installing a Telebit T2500 modem on our tower (400).
> It is now running just fine at 9600 baud on ttya.

> 	If I try to run it at 19.2kb on ttya will it put more of a load on
> the main CPU (68020) slowing the system down more than if I put it on
> another port (HPSIO) which has a 6809 to handle some of the I/O
> interface?

Yes, it will slow the cpu down significantly.  That's why the hpsio's
were developed (they have a 68010, not the 6809).

Moreover an ordinary 400 probably can't drive a telebit at 19.2kbps on
ttya or ttyb.

--
	-Mike Wescott
	 mike.wescott@ncrcae.Columbia.NCR.COM