Re: 9316 rom adapter.

Hanging head in shame... I guess there should be an address that isn't used
for ROM, hence the 'ninth' is "other": RAM, I/O etc.

John :-#)#

At 01:18 AM 08/02/2001, you wrote:
>Eight, not nine.
>
>(And you probably all thought I didn't read the messages any more!)
>
>
>John Robertson wrote:
>
> > The trick is that 9316's could be mask programmed to have the three chip
> > selects either high or low. So you can have up to nine ROMs sharing the
> > same data bus and selected just by their chip selects.
> >
> > John :-#)#
> >
> > At 06:52 PM 05/02/2001, you wrote:
> > >o.k. i got my old data out and found my old adapter.
> > >
> > >pin: 2716 9316
> > >21 Vpp(high=read) CS(active-low)
> > >20 OE(active-low) CS(active low)
> > >18 CE(active-low) CS(ACTIVE HIGH)
> > >
> > >get 3 24pin chipsockets(machined pin type)
> > >
> > >on the first socket file-off the pins until you reach the wide section of
> > >tube on pins 18 and 21.
> > >
> > >then using very fine wire connect pins 20 and 21 on the underside of the
> > >socket.
> > >next connect pins 18 to 24 using a small (1/8 watt) resister 1k,4k7,10k
> > >any of these will do.
> > >
> > >YOU HAVE JUST MADE THE UPPER SECTION.
> > >
> > >next take the second socket and drill-out pins 18 and 21 so you are left
> > >with holes in the plastic carrier.
> > >
> > >now plug the sockets into each-other with the un-assulted socket on the
> > >bottom and the jumpered socket on top.
> > >not forgetting the drilled socket in he middle.
> > >
> > >check with a meter to make sure it's ok, and put some epoxy on the sides
> > >between the layers to keep it together.
> > >
> > >CONGRATULATIONS, YOU HAVE MADE AN ADAPTER THAT WILL LAST FOREVER!
> > >
> > >I have used this method to make 7 different adapters for everything from
> > >16pin proms(to 2716) to plcc package to dip. it looks very professional!
> > >
> > >TO PAUL SOMMERS.
> > >I forgot to say in my post to you, that if you replace a 9316 with a 2716
> > >you will need to change the pins on the pcb-socket aswell as use an
> > >adapter to read the originals.
> > >i know it seems obvious but it's the obvious stuff that we allways
> overlook :)
> > >
> > >L8r.
> > >
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Received on Thu Feb 8 11:31:29 2001