Amiga.org
Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: julzinka on August 12, 2008, 11:05:58 PM
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ok. did the 50mzhfpu hack that i found on aminet. And now the amiga dont boot. the powerled blinks 9-10 times fast.
dose the hack even work ?
have anyone but me ever tryed it ?
maybe i should have asked thous questions befor i tryed the hack. but but. hmm
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Overclocking an FPU by 100% is a little bit hefty. I can belive that it might have worked for the original creator of this hack by pure luck just because some chips can actually take this amount of torture without freaking out.
I have read through the reasoning why it should work without any problem and I guess the guy must have gotten something wrong. Motorola would never have checked all FPUs at double it's nominated speed and then sell it for half of it. I they could have made faster chips (up to 100 MHz is mentioned) they would have sold faster chips.
This must have been some confusion with clock doubleing or something that lead to his assumption.
The bottomline is: He was just lucky.
Usually 50% of the 25 MHz rated FPU go bonkers already at 33 MHz, about 10-20 % make it up to 40 MHz. Only verry few will run stable or at all at 50 MHz especially in a PLCC housing with it's bad heat transportation capeabilities.
If you haven't had your A3000 on for to long you might not have cooked your 68882.
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I succesfully did the 50mhz hack on 2 of my A3000's many years ago. (heat sink also recommended).
Try taking the hack off and hopefully the Ami will boot again.
Plaz
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I was able to restore the hack so the computer boots again.
Plaz:
have u got any pics or something of the hack u did ?
i soldred a wire on the top side of the pcb from pin 11 to the resostor leg.