isgur2@physics.utoronto.ca (Daryl Scora) (06/04/91)
I recently bought an old (1988) Creative Microsystems Inc. 14MHz processor
accelerator for my Rev 5 A500, and installed a 68881 chip into the socket
available. It works fine at 7MHz, no acceleration both with and without
the 68881 enabled, it also appears to software toggle to 14MHz. However
when at 14MHz it will allow me to close, fronttoback etc the windows that
are open but dies upon doubleclicking an icon, or typing to a console
window. It either hangs, (ie. stops reading mouse, keyboard) or gurus
with a typical guru number B. Using NoFastMem seems to slows down the
speed at which the guru happens but does not stop it.
A more serious problem is that the system will not boot when my A590 hard
disk with 2Meg ram is plugged in, upon powerup the screen goes white and the
power light flashes. With no floppy in the drive (I have 1.2 ROM's) the
workbench prompt never appears.
Adding or removing A501 trapdoor memory expansion has no effect.
Any help would be appreciated, including the current address/phone/email
of CMI as the ones that came with the product no longer work. (or info
that the company no longer exists)
Thanks Daryl Scora
isgur2@physics.utoronto.ca
isgur2@utorphys.bitnet billsey@agora.UUCP (Bill Seymour) (06/06/91)
In article <1991Jun3.172141.25089@helios.physics.utoronto.ca>, Daryl Scora writes: > I recently bought an old (1988) Creative Microsystems Inc. 14MHz processor > accelerator for my Rev 5 A500, and installed a 68881 chip into the socket > available. It works fine at 7MHz, no acceleration both with and without > the 68881 enabled, it also appears to software toggle to 14MHz. However > when at 14MHz it will allow me to close, fronttoback etc the windows that > are open but dies upon doubleclicking an icon, or typing to a console > window. It either hangs, (ie. stops reading mouse, keyboard) or gurus > with a typical guru number B. Using NoFastMem seems to slows down the > speed at which the guru happens but does not stop it. Is the problem apparent without the 68881 installed? I'd guess so, but you never know... :-) Sounds like there's a problem with the E-Clock generation on your system. That will make several things act flakey, including double clicking on icons. It's been too long for me to remember what kinds of suggestions I would make to people who were having PA troubles way back then. :-( > A more serious problem is that the system will not boot when my A590 hard > disk with 2Meg ram is plugged in, upon powerup the screen goes white and the > power light flashes. With no floppy in the drive (I have 1.2 ROM's) the > workbench prompt never appears. > Adding or removing A501 trapdoor memory expansion has no effect. This sounds more like a noise or grounding problem. I'm assuming the socket is solidly plugged in... And that you're not trying to use a 2000 or 1000 version in your 500. If wosre comes to worst, you might try adding extra ground and power leads onto the board. Supply voltage fluctuations make a big difference in terms of the effectiveness of the clock doubler circuit. This could also be causeing the shakey E-Clock I think you're seeing. (see above) > Any help would be appreciated, including the current address/phone/email > of CMI as the ones that came with the product no longer work. (or info > that the company no longer exists) Although they're not doing direct CMI support, all the old CMI products have been picked up (except the KickStart Eliminator) by DigiFeX, in Oregon City, OR. Their phone number is (503) 656-8818. It can be a little tough getting a warm body, but I believe they do a fairly good job of responding to messages left on the machine... > Thanks Daryl Scora > > isgur2@physics.utoronto.ca > isgur2@utorphys.bitnet -Bill Seymour nesbbx!billsey@agora.uucp or nesbbx!billsey@agora.rain.com ***** American People/Link Amiga Zone Hardware Specialist NES*BILL ***** Bejed, Inc. NES, Inc. NAG BBS NES BBX BBS Home Sometimes (503)281-8153 (503)246-9311 (503)656-7393 (503)640-9337 (503) 640-0842