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Agilent 54835A scope (4 channel 1GHz / 4Gs/s) repair & uphack
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dogbert:
I don't recall mentioning anything about 54850 series on my post, but I know the difference between the VP22 boards can be removed by upgrading the BIOS supplied by Agilent.

Nonetheless, I agree with you that the best way to tell which generation it is by whether it has Megazoom. Also note that the 54830 series might come with an ADlink motherboard instead of Motorola VP22. The ADlink board has only 3 PCI slots that you have to use the combo card if you don't want to lose the GPIB. The downside is that the combo card does not work on old acquisition board, and it's not easy to tell without trial and error (I don't have a list of serial number ranges to tell which Acq board works with the combo card).
Converter:

--- Quote from: eurofox on September 22, 2017, 02:09:25 pm ---Update on my scope:
USB: My motherboard support 2 USB connections on the motherboard.

I bought this unit: http://electromyne.de/Server-Parts-Supermicro-FPUSB813-Server-Front-Panel-2x-USB-Serial-COM-RS232-Silver-Silber.html
Fit perfectly in the place of the original floppy, com port as well on the front.
It is plug & play and no need to pray, cables, screws all fit perfectly, com2 is now connected to the front panel.  :-DD

Manage in the bios to disable the floppy and work without problem with the floppy removed.  :clap:

I added as well memory, very cheap from the same shop and was shipped in 2 days door to door from Germany.  :-+

Got the exact colour to repair the little scratches and blemish, now my scope is in a real mint condition.

Install a pdf printer emulator.  :popcorn:

Now hunting for probes.  |O

--- End quote ---

I made a plastic overlay for the usb front panel (https://www.ebay.com/itm/202029998994). It was easy and now it looks like the original part. The whole process is shown in the photo.











Converter:
I recommend using the trackball, as Agilent suggests.
I found this part (with the Compaq logo) at a very low price in China. I bought 2 pcs in almost new condition for 99 yuan per piece (approximately $ 15).
One of them I dyed in the color of the front panel of the oscilloscope, using colors of two shades of gray. In reality, it looks more harmonious than in the photo and most importantly, that it does not require free space on the table.
Converter:
In the supplied software, the Windows desktop is locked. If you want to have the usual access to the desktop in Windows 98 you can do this only by editing the system registry. You can use the built-in utility Registry Editor. For this go to "start->run" and enter "regedit". You need to change the value of NoDesktop to 0, as on the attached photo. Address in the register: HKEY_CURRENT_USER\Software\Microsoft\Windows\Current Version\Policies\Explorer\NoDesktop

I have added usb ports to the front panel, so I no longer use a floppy device (drive A, B). However, despite deactivating them in Bios, I've seen drives A and B in the file manager.
You can also hide them, if you do not use them, using the System Registry setting. Address in the register:
HKEY_CURRENT_USER\Software\Microsoft\Windows\Current Version\Policies\Explorer\NoDrives
Depending on the value, different drive letters are hidden, 00 00 00 00 - none is hidden.
Value 1 - hides disk A
Value 2 - hides the disk B
Value 3 - hides disks A and B.


Gerhard_dk4xp:
My 54846B motherboard also has a normal floppy controller, in addition
to the exotic 120MB combi drive. That could help if the special drive is
defective and cannot be found as a replacement part. The Plug is directly
at the front side of the motherboard.

What drivers do I need for USB sticks under Win98? I could live with
the built-in interfaces on the back side and an external extension cable.
Sticks do not work in my configuration.

regards, Gerhard
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