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Agilent 54835A scope (4 channel 1GHz / 4Gs/s) repair & uphack
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Converter:
In some miraculous way, my Agilent 54845A turned into 54845B (at least so it is now shown).



I made a motherboard update and a software update v.4.5 for 54845B. I tried different versions of software, but only with this I got success.

Previously, there was an Atlas PCI-III Series 757 motherboard based on Socket 7 and AMD K6-2 300 MHz processor and 64 MB RAM.

Now the most advanced motherboard for AT-form factor with Intel 440BX chipset and Socket 370, with 133MHz bus, where the Coppermine core Pentium III processor can be installed, up to 1133MHz (or with a small upgrade of Tualatin 1400MHz) and 3x256 MB of RAM max.

The new motherboard is designated Tomato (ZIDA) 60-cbxict1
Next to her on the photo is an old motherboard Atlas Series 757


I also had to replace the Ethernet controller for the PCI slot








At the moment I used a P III - 733MHz processor.
Subjectively, now I noticed a significantly smaller loss of the frequency of updates to the oscillogram in the mode of activation of measuring functions, than it was before.







p.s.
Now I found information that the manufacturer installs in the 54845B motherboard "VP22 Motorola" (Socket 370) and processor Celeron/Pentium III - 866 (Coppermine). Thus, we can assume that I received the same without changing the form factor AT. The only difference is that I still do not have a built-in CD-ROM, but it's not required too often.
Jwalling:

--- Quote from: Converter on November 10, 2017, 10:38:13 pm ---In some miraculous way, my Agilent 54845A turned into 54845B (at least so it is now shown).

I made a motherboard update and a software update v.4.5 for 54845B. I tried different versions of software, but only with this I got success.

Previously, there was an Atlas PCI-III Series 757 motherboard based on Socket 7 and AMD K6-2 300 MHz processor and 64 MB RAM.

Now the most advanced motherboard for AT-form factor with Intel 440BX chipset and Socket 370, with 133MHz bus, where the Coppermine core Pentium III processor can be installed, up to 1133MHz (or with a small upgrade of Tualatin 1400MHz) and 3x256 MB of RAM max.

The new motherboard is designated Tomato (ZIDA) BXv98-CU/v693


--- End quote ---

Are you sure about the new motherboard part #? I ask because the images for it all show a Via chipset: https://www.google.com/search?q=BXv98-CU/v693&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwit6P26rbbXAhWKy4MKHSNOBswQsAQILg&biw=1518&bih=934

One on eBay has a Via chipset as well: https://www.ebay.com/itm/Tomato-Board-ZIDA-BXv98-CU-V693-Socket-370-Motherboard-4-PCI-2-ISA-AGP-slots/182114467065?hash=item2a66de3cf9:g:JG4AAOSwIjNXJcE3

Converter:
Hi Jwalling,
It looks like there really is a ZIDA motherboard with exactly the same external design, but with VIA chipsets. But on my board a set of Intel chips is actually installed. On my board there is only an inscription: 60-cbxict1 30-00 (I edited my previous post).
The manual was not found, but the display shows: -440BX-
BIOS allows to overclock the processor bus up to 150 MHz, which corresponds to the specification 440BX.
Jwalling:

--- Quote from: Converter on November 11, 2017, 02:41:54 pm ---Hi Jwalling,
It looks like there really is a ZIDA motherboard with exactly the same external design, but with VIA chipsets. But on my board a set of Intel chips is actually installed. On my board there is only an inscription: 60-cbxict1 30-00 (I edited my previous post).
The manual was not found, but the display shows: -440BX-
BIOS allows to overclock the processor bus up to 150 MHz, which corresponds to the specification 440BX.

--- End quote ---

Thanks for the clarification. Have you thought about upgrading it to a 2.25GHz 54846A/B?  :popcorn:
Converter:

--- Quote from: Jwalling on November 11, 2017, 04:51:28 pm ---Thanks for the clarification. Have you thought about upgrading it to a 2.25GHz 54846A/B?  :popcorn:

--- End quote ---

Yes, I want to follow your example. In any case, I will try. Has someone succeeded in the calibration procedure after changing 54845 to 54846?

I also have a couple of questions: how to get access to the Windows desktop in this device? What drivers are needed to use usb flash memory to save screenshots in it?
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