Re: Introduction of myself!
I was referring to the "Firmware upgrade and ROM reliability improvement" part of the "Tek mod kits and parts replacement" page you sent me the link to for the 7T11/A mod parts list. I surfed thru it for a few minutes and looked at the parts that pertain to equipment I have - so I know what should have been done if they were properly updated before I obtained them.
That specific update for the 7854 sounds to me to be a fairly important, and possibly critical one after all the time that has passed since the year it should have been updated in.
This is the link to the specific Mod page I was speaking of:
Also, this is the specific unit I purchased. B030771 S/N - My guess is that this is of the early version production.
---In TekScopes@yahoogroups.com, <hewpatek@...> wrote :
> Were the memory boards changed as part of an upgrade to older models?
I don't know the answer to your question, i.e. I don't know if an upgrade was available from Tek.
For a full upgrade the rear panel (with the fan opening and keyboard socket) would have to be replaced as well, since the two backup power banana sockets would go and a switch installed to allow selecting either running on backup power (Li battery) or restarting with system test after power up. The difference is obvious between the original version and the new version rear panel.
I do know that it's quite easy to modify the computer main board to accomodate the new integrated ROM/RAM board: Only one power supply wire need be connected to an unused connector main board pin. The old boards will work in the new model but not vice versa without installing the (power) wire.
One of my 7854's is a late version separate ROM/RAM version with new GPIB software ("1.03") in non-Mostek ROMs. Apart from the apparently improved GPIB handling, replacing the deteriorating Mostek ROMs could be an advantage. So, the OP could be lucky on two levels: Old Mostek separate ROM/RAM, old non-Mostek separate ROM/RAM, new integrated Li-backup ROM/RAM board.