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Agilent 54835A scope (4 channel 1GHz / 4Gs/s) repair & uphack
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Converter:
I found 2 processor Pentium III 1000 MHz (see photo). One of them is a later release and has a heat-distributing cover. However, they are both with the Coppermine core, so I do not need to modify the socket and change the Bios to switch i440BX to Tualatin.
Both processors excellently bother at a bus frequency of 140 MHz, but not one of them could not work reliably at 150 MHz.

For cooling, I bought a cooler intended for Socket 462 (Socket A). When it was delivered, it was twice the size of what was in my Socket 370, but there was not the slightest obstacle to its easy installation in the motherboard.
It has a bifurcated bracket attached to the 4 protrusions of the socket, in contrast to the radiator for socket 370, which is attached to only 2 ledges. So it seems that this is kept much more stable.

The image from the hard disk was successfully transferred to the IDE SSD and the partition was increased to 16 GB using the alignment operation. This inexpensive drive showed sequential read speed of about 85MB/s, which is 1 order of magnitude greater than the old disc, but the most bottleneck here is Hard Disk Controller - PIO Mode 5/DMA Mode 3 (33.3MB/S).
Probably a better solution is to use a separate expansion card in a PCI slot with a sata controller. But then the loading of an individual BIOS for such a controller will be added during the start of the computer, which can again worsen the start time of the device.


Converter:

--- Quote from: Gerhard_dk4xp on December 28, 2017, 04:42:51 am ---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.

--- End quote ---
Hi,
I used these:
https://www.eevblog.com/forum/testgear/agilent-54835a-scope-(4-channel-1ghz-4gss)-repair-uphack/msg1347291/#msg1347291
JanNousiainen:
Well I got mine working again with clean install of 3.5 recovery CD:)

I had to borrow Mac G5 DVD drive that had IDE interface and use Rasp Pi GPIO extender ribbon cable to connect it to scope. After that it was smooth sailing and now my unit runs on Windows 98. I might install later updates if I feel brave someday.

Only problem was in calibration. I used too long BNC- BNC cable (1.5 - 2 m) to connect channels to AUX OUT and calibration would fail. I switched to 25 cm long better quality SMA + BNC adapter - BNC cable and no problems after that.

Now I just need to figure what I want to do with the scope...
Converter:

--- Quote from: JanNousiainen on January 04, 2018, 12:33:32 pm ---Only problem was in calibration. I used too long BNC- BNC cable (1.5 - 2 m) to connect channels to AUX OUT and calibration would fail. I switched to 25 cm long better quality SMA + BNC adapter - BNC cable and no problems after that.

--- End quote ---
It's strange. I used to calibrate the cables of different lengths and the process is always successful. I know that the instruction requires a short cable, just wondering, for what reason is the cable length important here?


--- Quote ---Now I just need to figure what I want to do with the scope...
--- End quote ---
You, like me, want to convert oscilloscope to Windows XP :)
Tony_G:

--- Quote from: Converter on January 04, 2018, 03:44:59 pm ---for what reason is the cable length important here?

--- End quote ---

The cable length will impact the rise time of the calibration pulses.

TonyG
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