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From: baxter@milano.UUCP
Newsgroups: net.micro.6809
Subject: CoCo III, 1.8 Mhz, Slow Peripherals
Message-ID: <2676@milano.UUCP>
Date: Thu, 23-Oct-86 15:25:12 EDT
Article-I.D.: milano.2676
Posted: Thu Oct 23 15:25:12 1986
Date-Received: Fri, 24-Oct-86 01:16:11 EDT
Sender: baxter@milano.UUCP
Organization: MCC, Austin, TX
Lines: 33
Keywords: CoCo III

Those of you having CoCo IIIs and some understanding of the hardware
can do a great service for those of us who don't.  CoCo III promises
compatibility of peripherals with CoCo II peripherals, presumably
including floppy disk controllers and modem cards.  It also promises
1.8 Mhz operation.  Usually faster processors won't work with
controllers designed for slower machines controllers (Motorola
supplies different versions of it 6809 family for different clock
rates); can someone explain why the CoCo III should be an exception?

For BASIC, I suppose that the following strategem might work: run at
1.8Mhz until I/O is necessary, slow down to .8Mhz, do the I/O, speed
back up again.  If this was done consistently, I don't understand the
CoCo III is delivered running at .8Mhz as the default (excuse my
ignorance if that's not the case... data on the CoCo III is really
hard to find right now).

Under OS-9, the strategem wouldn't work as well, especially if several
devices were busy at once.  Reducing OS-9 to running at .8Mhz as the
least common denominator would make a joke of the 1.8Mhz ability.
Anybody sane would automatically WANT the 1.8Mhz as the default, so I
presume that it is under OS-9... so there must be a different
strategy.

An aside: was the typeahead problem with OS-9 ever solved (i.e.,
I can't typeahead while the disks are spinning?

Replies should be to the net.  If I get personal replies, I will
summarize.

Sorry about the bungled message preceding.
-- 
Ira Baxter            arpanet: baxter@mcc.com
MCC Corporation       usenet:  ut-sally!im4u!milano!baxter