[sdiy] Really Need Help this time!

[Benjamín Velasco]

Hi! Togday i gave it another try. I rewired everything, starting with the
8031 and then adding IC1 and IC2 but i still have the same problem. The WR
pin stays high all the time. Also, the 4 outputs for the MUX arent toggling
and stay HIGH. Im using a digital oscillocope and seems to me the pulses
arent very"square" or clean. Maybe because of the high frequencies??.

>  }
> then on the 8051 check:
> --------------
> Pin 31 - \EA - ensure it's low;
>
 It's low.

  Pin 30 - ALE - ensure it's toggling and also read it at the addrs latch
> IC1 pin 11;
> Pin 29 - \PSEN - ensure it's toggling and also read it @ IC2 #22;
>
>

They are toggling


  -----
> Pin 1 - \OC - is low;
>
>

It's low

  IC2
> ----
> Pin 1 & 27 are Hi
> Pin 20 is low
>

OK

I'm using the  Phillips P80C31X2BN for the processor. I'm quite sure the
EPROM programmed correctly. What else could be wrong? Mayube the processor?
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