Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!ucsd!ucsdhub!esosun!seismo!uunet!frksyv!frk
From: frk@frksyv.UUCP (Frank Korzeniewski)
Newsgroups: comp.unix.xenix
Subject: Re: 8-port serial async cards??
Message-ID: <384@frksyv.UUCP>
Date: 7 Feb 89 10:47:46 GMT
References: <8417@dasys1.UUCP> <1135@netxcom.UUCP> <823@wb3ffv.ampr.org> <390@bilver.UUCP> <2870@ddsw1.MCS.COM> <8878@alice.UUCP>
Reply-To: frk@frksyv.UUCP (Frank Korzeniewski)
Organization: Frank Korzeniewski, Consulting
Lines: 22

In article <8878@alice.UUCP> debra@alice.UUCP () writes:
>You realize you are being very demanding (even for a board with an
>8Mz 80186). We used to have an old Altos, with controllers for 8 terminals.
>We used 1 port for 4800 baud uucp-input, and the others for 9600 baud
>terminals. Any uucp traffic (input) on the one port would visibly slow
>down output on the other terminals (even when using only one) to 1200 baud.
>Those boards used a 4Mhz Z80 I believe.

Several years back I ported CCPM to a multi-processor. The configuration was
a main processor 4MHz Z80 (yes that is 4). The passive satellites were 5Mhz
8088s. The console thruput with 8 satellites generating continuous console
output (1 direction - out) was about 75,000 baud. An 8Mhz 80186 should be
able to match this. All it takes is a lot of care in coding the routines
in assembler.

Frank

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