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From: halkoD@batman.moravian.EDU (David Halko)
Newsgroups: comp.os.os9
Subject: High Speed OS9 Level II on a CoCo3
Summary: A little Speedup... to a CoCo3
Keywords: disk drive, high density, os9
Message-ID: <2566@batman.moravian.EDU>
Date: 4 Feb 91 02:06:01 GMT
References: <Jan.2.12.25.00.1991.24309@pilot.njin.net> <1991Jan3.011714.698@engin.umich.edu>
Distribution: usa
Organization: Moravian College, Bethlehem, PA
Lines: 42

OK... I tried the switch... I swapped crystals on the CoCo3 with 512K to get
a boost in speed... no problem, it worked most of the time <smile>... I did it
a week ago over my break, so I don't remember what I was running it at, but
I know I was getting a significant speed increase according to my calculations.

I figure, replace my 120ns DRAMS with 80ns drams, swap a 48MHz clock crystal 
for what is in there to get a full 3MHz, and the machine would operate ALMOST
reliably, right? (I will probably have to find faster 256x1Bit DRAMS from
somewhere to make it reliable... at 3MHz, I believe I will need 60ns DRAMS,
but I am sure I will be able to get by with 80ns...)

Now, would there be an easy way to SYNC up the CM-8 with the high speed CoCo3?
I took apart my VM2 and my CM-8 with little success... The CM-8 has a clock
crystal on the motherboard of the monitor somewhere under a metal shielding
case, but I can't get at it! It is secured somehow without screws or clips!
The VM2 has no crystal in it at all, but it STILL wouldn't sync up with the
CoCo3 after playing with horizontal and vertical hold...

I figured if I exactly doubled the speed of the CoCo3, I could adjust the
scan rate of the CM-8 by changing that crystal appropriately (but I can't get
at it right now since I do not want to cut the shielding away RIGHT NOW with
a small hack saw...) If I do change the crystal in the CM-8, would the two
sync up properly???

Could I just adjust the H and V holds and play with the adjustments on the
guns on the monitor???

I don't really mind if I will blow up the 6809 (I'll replace it with the
CMOS equivalent) or the GIME (I'll by some stock in Tandy! <smile>) or the
PIA's (I'll have a reason to socket them...) Just want some raw speed. I am
sure the Eliminator will handle the speed up without a problem... any help
at this point would be appreciated before I try stepping the clock rate
higher (my wishing point is 5MHz... that would bring me somewhere around the
speed range of an MM/1 or low line 68K Tomcat... I figured at 3-5 MHz, the
CoCo would turn RiBBS into a quick BBS and give me the ability to run it
on 4 or so lines without bogging down the 6809 too much... would like to
run a little UUCP as well... maybe test a serial networking interface that
has been in the works... the speed is a must...) When this project is 
complete, I will add the 1 Meg upgrade to the CoCo and I'll be ready to fly.

Any help would be appreciated... Thankyou.
	David J. Halko