Anyone have issues using certain 8M EPROMS?

[Jazman]

Hey guys,

I had been using what I think was an AMD part before I brain-farted
and blew it up. So, now I have some new, unused Atmel AT27C080-90
parts that don't boot. They program and verify just fine. They
behave as if no ROM is present at all.

I've used the parts in WMS Dotmation slots before so I know the parts
are OK. But, they don't seem to work here. I'm going to try a
different CPU from another machine tonight to see if it's maybe
marginal timing.

Anyone have wierd experiences with certain ROM brands?

Keith

[Ewan Meadows]

Are you sure the CPU board is jumpered correctly for 8MBit?

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[Cardona, James E.]

the jumper config is the same for 1, 2, 4mbit or 8mbit
Only different for 512k
jim

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[Ewan Meadows]

Ah of course, been farting around with DE sound boards today so I got
all confused. Having only used 4Mbit eproms I wouldn't be able to say
why, maybe timings as you mentioned.

[Jazman]

Well, definitely something about these parts and the WPC board I
have. I ended up finding a different part type and put that in just
fine. It's weird, because I then put these Atmel parts where I got
that one out of and it was no problem. So, I'm not sure exactly
what's going on. The -90 speed should be just fine. At some point I
will have to try these parts in a different WPC board to see if it's
something specific to this particular board...

Keith

On Mar 19, 7:56 am, Ewan Meadows <ewan.mead...@gmail.com> wrote:
> Ah of course, been farting around with DE sound boards today so I got
> all confused.  Having only used 4Mbit eproms I wouldn't be able to say
> why, maybe timings as you mentioned.
>

> On 19 March 2013 21:53, Cardona, James E. <James.Card...@pseg.com> wrote:
>
>
>
>
>
>
>
> > the jumper config is the same for 1, 2, 4mbit or 8mbit
> > Only different for 512k
> > jim
>
> > -----Original Message-----
> > From: fre...@googlegroups.com [mailto:fre...@googlegroups.com] On Behalf Of Ewan Meadows
> > Sent: Monday, March 18, 2013 10:10 PM
> > To: fre...@googlegroups.com
> > Subject: Re: Anyone have issues using certain 8M EPROMS?
>
> > Are you sure the CPU board is jumpered correctly for 8MBit?
>

> > On 19/03/2013, Jazman <cartra...@yahoo.com> wrote:
> >> Hey guys,
>
> >> I had been using what I think was an AMD part before I brain-farted
> >> and blew it up.  So, now I have some new, unused Atmel AT27C080-90
> >> parts that don't boot.  They program and verify just fine.  They
> >> behave as if no ROM is present at all.
>
> >> I've used the parts in WMS Dotmation slots before so I know the parts
> >> are OK.  But, they don't seem to work here.  I'm going to try a
> >> different CPU from another machine tonight to see if it's maybe
> >> marginal timing.
>
> >> Anyone have wierd experiences with certain ROM brands?
>
> >> Keith
>
> >> --
>
> >> ---
> >> You received this message because you are subscribed to the Google
> >> Groups "FreeWPC" group.
> >> To unsubscribe from this group and stop receiving emails from it, send
> >> an email to freewpc+u...@googlegroups.com.

> >> For more options, visithttps://groups.google.com/groups/opt_out.

>
> > --
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> > ---
> > You received this message because you are subscribed to the Google Groups "FreeWPC" group.
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> > For more options, visithttps://groups.google.com/groups/opt_out.

[the...@adinet.com.uy]

hi, really i suspect for the atmel brand, i have a willem programmer
and atmel paractically don't work, i use st thompson brand with no
problems, a sure bet, alex