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

David Fish wrote:

>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.
>
>

The 18S42 was TI's new numbering for the 74S472 and the 28S42 was a
similar part. They should all be readable using the 74S472 codes.
Datasheets are here for the 18S42
<http://www1.cedar-rapids.net/00000028/IHS/18S42.pdf> (just tells you it
was a new part number for the 74S472), 28S42
<http://www1.cedar-rapids.net/00000028/IHS/28S42.pdf>, and 74S472
<http://www1.cedar-rapids.net/00000028/IHS/74S472.pdf>.

>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>
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>>>>
>>>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:
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>>>
>>--
>>Franklin Bowen (Franklin@Bowen.net)
>>http://fmbbowen.com:39353
>>

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Received on Thu May 6 03:31:31 2004