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HP 70K/HP 70000 Modular Measurement System Thread

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pquadrat:

--- Quote from: Paul B on January 24, 2022, 07:06:10 pm ---Hi all
My name is Paul Bicknell and I live on the south coast in England

Although I am new to this site I have been playing with HP 70 K for a few years now
And I might know a few of you from the Groups IO site 

I am presently trying to decide on the replacement capacitors to rebuild the power supplies in
3 off 70900 A local oscillators that have failed

My next project is to modify a 70900 B local oscillators to have
The latest firmware and 512 K of memory upgrade
also the receiver personality could anyone please help me with the following

Dear PQUADRAT  Could I take you up on your offer of how you did your upgrade
Also could you please let me have the make and part numbers of the sockets you used
For your upgrade of the firmware memory ?
Also What equipment do I require to program the firmware / ROM chips for the 70900B ?

Could you also explain the memory upgrade hopefully a picture before and after the 512 K memory upgrade

I have a 8705A 512K memory card how can I find out what is on it  ?
Can anyone help me with putting the receiver personality onto the 8705A 512K memory card ?

Regards Paul   PS sorry about the long list

--- End quote ---
Hi Paul,

For the capacitors I use good quality Panasonic ones, working perfect.

All my picture of the upgrade are in this thread. I don't have more.

the RAM Chips are: TC551001BFL-70
The EPROMs are  Intel N27C010-150, AMD AM27C010-150, or Flash chips 28F010 also work.
ROM content is on the net, You will have it.

I did use sockets on the first one, PLCC28 sockets should fit. But I had more problems with the sockets, so I soldered the other two boards without sockets.

For the RAM Upgrade, You have to change one PAL. Type is PALCE16V8. Not many programmers can programmers can program it. File is attached.

Soldering the ROMs is not that easy, I had to improve my soldering skills. RAMs are easier.

-Peter

pquadrat:
This is the PAL content for the 1MB Upgrade.
In the previous thread it was the version for the 256kB version.

Paul B:
Hi Peter

Thank you for your return email unfortunately i am not that good with software and computers and dealing with the firmware
so i might require a bit of help so could we possibility exchange email addresses ? as i am also new to this site

Regarding memory up grades from HP documentation on 70900B withe date code 901008 and later
RAM memory is 128 K and 700K  with the Option 512 but you refer to 256 K and 1024 K could you please explain the difference 

Best Regards Paul

pquadrat:
Paul: PM sent.

Paul B:
Hi Peter
just a line to create a bit of traffic
regarding the Groups IO site and the HP 70000 group hopefully you would agree that the site holds more data on HP 70000 than any other site available

Regards Paul

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