At 06:17 PM 9/17/2015, you wrote: >Hi all, > >I proudly own 3 128DCR's just last year I >attached my V2 Super CPU MMU adapter and its >jumper clips clip to certain pins on the 8502 >CPU of course using the CMD installation guide. > >This all seemed to work okay I had the computer >on for a few hours and then out of the blue¬ >some random fine dots appeared on the screen and it locked up completely. >This was intermittent so I never knew when computer would lockup. ¬ > >I asked Ray Carlsen about this he suggested >isolating each chip with a piece of thick >cardboard heat each chip this way and maybe the lockup might happen. > >I heated the MMU chip BAM it locked up the same way. > >I removed the MMU chip out of the MMU adapter, >installed MMU chip in MB socket heated¬ >again, Bam same lockup. > >I robbed an MMU chip out of a dead Flat 128 >installed in socket heated it but finally no >lockup this time.¬ I wonder if the Super CPU >MMU adapter if that is installed wrong if this >might damage the MMU chip.¬ I had always >installed mine correctly anyway and rechecked¬ >a few more times before applying any power. > >I just wanted to pass this info on maybe some >know of isolating chips in this way >this sure made my day to figure this problem out. ¬ > >Im just wondering if anybody else has had the same MMU problem or bad MMU,¬ >intermittent lockups? > >I like the V2 SCPU for the 128 but it seems to >be a bugger to get it to run correctly I have >always had problems occur with the MMU adapter >itself, the Super CPU unit has always¬ >performed good. > >Positive SUPER CPU comments only I really like >the unit, but really concerned about the MMU >design.¬ The MMU I believe has something to do >with the timing on the MMU so the¬ >Super CPU can run in 128 mode I may have missed other details. > >Terry Raymond I soldered the wires from the MMU board directly to the CPU, I had no more problems. Those clips suck! --- WWW: http://www.commodoredungeon.com QUOTE : "A Clean bench is a sign of a weak mind." Message was sent through the cbm-hackers mailing listReceived on 2015-09-17 23:00:07
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