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 (503) 684-9300 (503) 656-7393 BBS (503) 640-0842