Path: utzoo!attcan!uunet!tektronix!percival!parsely!agora!billsey
From: billsey@agora.UUCP (Bill Seymour)
Newsgroups: comp.sys.amiga
Subject: Re: CMI board causing the Green Screen?
Message-ID: <1170@agora.UUCP>
Date: 25 Sep 88 07:12:58 GMT
References: <696@mailrus.cc.umich.edu:
Organization: Advanced Solutions, Hillsboro, OR
Lines: 50

From article <696@mailrus.cc.umich.edu:, by mike@shogun.cc.umich.edu (Michael Nowak):
: 
: My board didn't come with documentation describing the jumpers on the
: CMI board.  What are the various jumper settings?  Also, do new 1.3
: ROMS work better at the higher speed?  If I take the J1 jumper off, can
: I still use ToggleSpeed to increase the speed and not get the Green
: Screen?
: 
	There were a few shipped without the little extra page that told
about the jumper settings. Sorry 'bout that! Anyway, here they are:

                               |  U2.PAL                 |
                               ---------------------------
                                           o  o  o  o  o
                                           1  2  3  1  2
                                           -------  ----
                                             J2      J1

When J1 is shorted (Default on the 500/2000 boards) the FastROM mode is
enabled. (We called it the 500/2000 <-> 1000 setting on that sheet.) It 
is possible that this was causing your problem, although I've never seen
one that failed. When J2 is shorted between pins 1 & 2 you're in the 14M
Forced mode. This means that the board powers up at 14Mhz and is *not*
toggleable. Some of the newer Rev 3 board don't have this option (Look on
the back of the board for a blue jumper wire under J2 on the older Rev 3s
and a 560 Ohm resistor on the newer Rev 3s.) If you have the newer Rev 3,
a 2000 and wish the 14M Forced mode, give me a ring and I'll explain how 
to change it. When J2 is shorted between pins 2 & 3 on the older Rev 3
boards you're in the standard mode. You power up and warm boot at 7Mhz and
use ToggleSpeed (or the newer PA) to change to 14Mhz.
	The Rev 4 boards (not shipping yet, but RSN...) will allow you to
have both 7 or 14Mhz default with all machines and they have a jumper for
the 500 or 2000 selection. This mainly helps us tune the board better for
all those Amiga/peripheral combos out there. It's possible that the 1000
Rev 4 board will allow a 14Mhz forced mode also. But not tested yet...
: 
: ------------------------------------------------------------------------------
:  In Real Life:	Michael Nowak
:  		Workstation Consultant
:  		U of M Computing Center User Services
:  Via Internet:	mike@shogun.cc.umich.edu
:  Via UUCP:	mailrus!shogun!mike 
: 
:  Working for but in no way representing the University of Michigan.
: ------------------------------------------------------------------------------
-- 
     -Bill Seymour             ...tektronix!reed!percival!agora!billsey
                               ...tektronix!sequent!blowpig!billsey
     Creative Microsystems   Northwest Amiga Group    At Home Sometimes
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