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it might not be permanently dead, but if it's not, it's not working.
one (or more) of the outputs of these two chips is probably shorted to
ground or shorted to +5v. the chips get hot when they try to drive
this output to a state other than the one it is shorted to.
with power off, get out your voltmeter and measure continuity from
each of the hc132 and ram pins to +5v and gnd. find the pin(s) that
stuck in one of these states and shouldn't be.
fred
In your message you said:
> I suspect that I fried my memory chip. The handyboard downloads
> Pcode perfectly, but when it tries to synchronize with interactive C,
> I get an error. While the board is off the 62256-12LP and the 74HC132
> chips stay hot. is there a good diagnostic that I can perform to see
> whether or not the chip is actually dead?
>
> thanks
> -Kevin Peterson
>
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Message is in Reply To:
 | | fried memory
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| I suspect that I fried my memory chip. The handyboard downloads Pcode perfectly, but when it tries to synchronize with interactive C, I get an error. While the board is off the 62256-12LP and the 74HC132 chips stay hot. is there a good diagnostic (...) (25 years ago, 26-Oct-99, to lugnet.robotics.handyboard)
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