prom replacements?

Question

I have a nice old HP 5340A counter that isnt working. A little peeking at signals shows that the two state-machine control PROMS are loopy. They output "1"s all the time. Luckily the service manual lists the data that used to be in them. So burning new ones is a possibility. But:

They're old old 16-pin proms, 5 address lines by eight bits out.

Inputs on 10-14, outputs on 1-8 and 9.

Does anyone know of anything with a similar pinout?

Our do I have to make a 27C16 to this pinout adapter?

Thanks,

A_H

**THE-RFI-EMI-GUY** · Accepted Answer

Try contacting this guy, he may have the PROM image for yours.Ancient_Hacker wrote:-- Joe Leikhim K4SAT"The RFI-EMI-GUY"©"Treason doth never prosper: what's the reason?For if it prosper, none dare call it treason.""Follow The Money"  ;-P

Mark Zenier · Answer

82S23 SN74S188 (open collector) 82S123 SN74S288 (tri-state outputs)

There's probably a dozen other part numbers from the various manufacturers in the mid 1970's, but these are probably the most common.

Mark Zenier snipped-for-privacy@eskimo.com Googleproofaddress(account:mzenier provider:eskimo domain:com)

JW · Answer

On Thu, 10 May 2007 09:16:55 +1000 Franc Zabkar:If they are, the OP should check pin 15 to be sure that the devices arebeing enabled. From my experiences, when a '288 goes south, it's outputstend to drive low.

Ancient_Hacker · Answer

Thanks to all for the info and kind offers.

One problem though-- the manual I got from the Agilent site seems to have been partly OCR'ed-- and the tables of data for the PROMS has a few garbled and missing bits!!! What a bummer!!

Does anyone have an actual manual for the 5340A? Or a PROM dump?

Multitudinous thanks in advance,

A_H

Franc Zabkar · Answer

On 10 May 2007 03:39:33 -0700, Ancient_Hacker put finger to keyboard and composed:

In the absence of a printed manual or a PROM programmer, why not verify the contents of your own PROMs using a little jig consisting of

5 DIP switches and, if necessary, 8 pullup resistors and 8 LEDs?

- Franc Zabkar

**THE-RFI-EMI-GUY** · Answer

Try contacting this guy, he may have the image and tools to build the proms.Ancient_Hacker wrote:

prom replacements?

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