Re: burning proms

Kevin,

On Mon, Mar 8, 2010 at 8:51 AM, Kevin Moore <talon.k@gmail.com> wrote:

> It's been suggested that you can use 93446 proms in place of the 74s287
> and 74s288,

Again, do you have a link or thread?

Was that a TI or Nat'l 74S287? ;-)

A 74S287 could be replaced by a 93446 in the manner you described, in some
applications. Fortunately, that would include most vector applications
(excluding Sega Spaceship).

A 74S288 is a completely different organization (i.e. x8), and does not have
the pins you described below. If you wanted to use a Fairchild part in place
of a '288, you'd need a 93448, which is in a 24 pin package, so you'd have
to "force it to fit and paint it to match", but it would work.

-Mark

> by burning the bin on the bottom half of the prom. Since pins 13 and 14 of
> a 74s28x are grounded, you would have no need for the CS, and A8 lines on
> the 93446.
>
> Since I'm still pretty new at burning stuff I thought I would inquire as to
> how to do this.
>
> I'm using a Data I/O to burn this stuff.
>
> My first attempt didn't work.
>
> I read the 74s288 into memory, checksum was good. I then burned the buffer
> onto the 93446 and tried it. No joy.
>
> So I'm hoping someone smarter than myself can teach me the mystical ways of
> doing this, as the 93446 chips are cheap, and readily available.
>
>
> Thanks,
>
> Kevin
>
>

---------------------------------------------------------------------------
** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
** Please direct other questions, comments, or problems to chris@westnet.com
Received on Mon Mar 8 13:14:56 2010