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Agilent 54835A scope (4 channel 1GHz / 4Gs/s) repair & uphack

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Tony_G:

--- Quote from: nctnico on July 13, 2017, 10:30:06 pm ---Secondly and worse: Windows98 starts acting up if I connect the drive. This may have to do with the fact that it isn't a normal floppy drive but a combination between a floppy disk and a 120MB optical drive (pretty amazing how they put all that into such a small space).

--- End quote ---

All those drivers should be in images you got from my link. Mine doesn't have the super drive but I've been thinking of adding it.

TonyG

nctnico:

--- Quote from: Tony_G on July 14, 2017, 04:06:37 am ---
--- Quote from: nctnico on July 13, 2017, 10:30:06 pm ---Secondly and worse: Windows98 starts acting up if I connect the drive. This may have to do with the fact that it isn't a normal floppy drive but a combination between a floppy disk and a 120MB optical drive (pretty amazing how they put all that into such a small space).

--- End quote ---
All those drivers should be in images you got from my link. Mine doesn't have the super drive but I've been thinking of adding it.

--- End quote ---
I made a typo: Windows98 starts acting up when the drive is not connected.

Jwalling:

--- Quote from: nctnico on July 14, 2017, 09:16:59 am ---
--- Quote from: Tony_G on July 14, 2017, 04:06:37 am ---
--- Quote from: nctnico on July 13, 2017, 10:30:06 pm ---Secondly and worse: Windows98 starts acting up if I connect the drive. This may have to do with the fact that it isn't a normal floppy drive but a combination between a floppy disk and a 120MB optical drive (pretty amazing how they put all that into such a small space).

--- End quote ---
All those drivers should be in images you got from my link. Mine doesn't have the super drive but I've been thinking of adding it.

--- End quote ---
I made a typo: Windows98 starts acting up when the drive is not connected.

--- End quote ---

The IDE channel on those FIC motherboards is a bit flakey. It doesn't like some PATA SSD drives I've tried either. Maybe the added loading of the LS-120 compensates the bus a bit. One or more ringing signals maybe?

Wuerstchenhund:

--- Quote from: Jwalling on July 14, 2017, 09:23:49 am ---The IDE channel on those FIC motherboards is a bit flakey. It doesn't like some PATA SSD drives I've tried either.
--- End quote ---

The IDE controller in the buggy VIA chipset's Southbridge only supports (some buggy) UDMA-33 (UDMA-2) while most PATA SSDs require at UDMA-100/133 (UDMA-5/6). Also, if I remember correctly (and that's been a long time), only the primary IDE channel even supports UDMA (I think the secondary channel is PIO only).

Personally, I wouldn't bother with SSDs on this scope. Considering the poor performance of the VIA Apollo chipset and the limitations of the OS (Win98) I guess the best option would be an IDE-to-CF adapter. CF cards that support IDE mode usually support PIO modes which might be safer with this chipset than UDMA. Newer cards (Rev. 3 and newer) also support UDMA-33 and UDMA-66 modes (some Rev 2 cards support UDMA-33 as well). A Rev 3 card should be fast enough for this application.

A practical option would be one of the expansion cards that have a CF slot in the slot cover or a slimline CF reader so the card is accessible from outside. It would also allow to easily change between multiple copies i.e. for experimentation, or having a card for each project which contains only stored settings/screenshots/waveforms for that project. It also makes it easy to copy data to a PC.

nctnico:
The problem with IDE CF cards is that these are typically marked as removable media. Some biosses will not boot from these and some software won't install on a removable drive. I have used exactly the same mSata to PATA adapter in my Tektronix TLA715 because of these problems. Still I agree that the motherboard and CPU are rather poor choices. BTW UDMA is disabled in the VA-503A BIOS by default and probably for a good reason.

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