Re: How do I read a TI 18S42 with a Data I/O 29b/2b?

Hmmm... 1980. The TI book I looked in was 1985. I'd guess
that the 18S42 was superceeded by the 28S42, the 28S42 is a
512 X 8 PROM w/3-state outputs and according to a enhanced
'Wiretap' file found at the link below, the 18S42 is the same. I
can't find any data on the 18S since my freetradezone account
expired.

http://wulfman.com/pdffiles/rom95f-10.pdf

The National Semiconductor 54/72S472 are ALSO 512 X 8
PROMs so there's a good chance that thier pinout is the same.
I don't have the data book for those handy right now.
The F/P code is 08/09 for these parts.

*IF* you are only reading the PROM, and not trying to program one
there is a VERY good chance that either F/P code will work. The F/P
codes set the pinout configuration for the programmer along with
the MORE critical programming algorithms (voltage levels, slew rates,
pulse widths, repetitions and more). But since you are JUST reading
the device you should be OK with either.

Standard static protection procedures (ground yourself before touching IC
and ground target through yourself before inserting IC) should be enough.
Although it never hurts to be MORE careful.

Dave
----- Original Message -----
From: "Franklin Bowen" <Franklin@Bowen.net>
To: <techtoolslist@flippers.com>
Sent: Wednesday, May 05, 2004 6:28 PM
Subject: Re: How do I read a TI 18S42 with a Data I/O 29b/2b?

> Thanks Dave!
>
> J8048A
> TBP18S42N
>
> I looked at the schematics (this is from Red Alert, the Character board)
> and they label the part "S472". I did a search in the device files and
> found these 2 entries. Do you think they are a closer match than the
28S42?
>
> NAT 54S472 PROM DIP 008/009 V07
C
> NAT 74S472 PROM DIP 008/009 V07
C
>
> This is my first foray outside of EPROMs. Do I need to be MORE careful
> about static with PROMs?
>
> Thanks!
>
>
> At 01:53 PM 5/5/2004, David Fish wrote:
> >I would try reading it as a TI 28S42 first, use F/P code 13/09.
> >I can't find the 18S42 in my old TI data books and it's not
> >listed on the D I/O wall charts either. It seems to be a very
> >obscure part. Is there a date code stamped on it?
> >
> >You're probably right about the 2B's revision being the last three
> >digits. Mine is 950-0086-006.
> >
> >Good luck,
> >Dave
> >
> >----- Original Message -----
> >From: "Franklin Bowen" <Franklin@Bowen.net>
> >To: <techtoolslist@flippers.com>
> >Sent: Wednesday, May 05, 2004 12:27 PM
> >Subject: How do I read a TI 18S42 with a Data I/O 29b/2b?
> >
> >
> > > How do I read a TI 18S42 with a Data I/O 29b/2b? I did a search
through
> > > the device files and found no match. A search on Google found this
> >article:
> > >
> > >
http://groups.google.com/groups?selm=leD3a.129288%24vm2.77578%40rwcrnsc54
> > >
> > > So can I read this as a AMD 27S29, a device that the 2b supports?
> > >
> > > A couple unrelated questions:
> > > 1) What is the A/C (last) column in the device lists?
> > > 2) How do I tell the version number of my 2B? On everything else it's
> > > obvious. Is it the last 3 digits of the part number? So 950-0086-011
> > > would mean I have a version 11?
> > >
> > > Thanks!
> > >
> > > --
> > > Franklin Bowen (Franklin@Bowen.net)
> > > http://fmbbowen.com:39353
> > >
> > >
> > > If you ever want to (un)subscribe yourself with TTL, you can send mail
to:
> > > <Majordomo@flippers.com>
> > > with the following command in the body of your email message:
> > > (un)subscribe techtoolslist
> > > or from another email account, besides xxx@yyy.com:
> > > (un)subscribe techtoolslist xxx@yyy.com
> >
> >If you ever want to (un)subscribe yourself with TTL, you can send mail
to:
> ><Majordomo@flippers.com>
> >with the following command in the body of your email message:
> >(un)subscribe techtoolslist
> >or from another email account, besides xxx@yyy.com:
> >(un)subscribe techtoolslist xxx@yyy.com
>
> --
> Franklin Bowen (Franklin@Bowen.net)
> http://fmbbowen.com:39353
>
>
> If you ever want to (un)subscribe yourself with TTL, you can send mail to:
> <Majordomo@flippers.com>
> with the following command in the body of your email message:
> (un)subscribe techtoolslist
> or from another email account, besides xxx@yyy.com:
> (un)subscribe techtoolslist xxx@yyy.com

If you ever want to (un)subscribe yourself with TTL, you can send mail to:
<Majordomo@flippers.com>
with the following command in the body of your email message:
(un)subscribe techtoolslist
or from another email account, besides xxx@yyy.com:
(un)subscribe techtoolslist xxx@yyy.com
Received on Wed May 5 22:01:53 2004