[sdiy] Really Need Help this time!

[Benjamín Velasco]

Maybe this is an stupid question but the only thing you program is the Eprom
right?

2006/5/26, Benjamín Velasco <guatis at gmail.com>:
>
> 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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