I wanted to post some info for others that stumble upon this thread via Google.
My SMART Table 442i came with an embedded PC made by Advantech, model ARK-DS262. It's a 3rd gen Intel Core i3-3217IE at 1.6Ghz. It has an Intel QM77 chipset, Intel CPU-integrated graphics, AMI 64 Mbit BIOS, two SODIMM slots for up to 8 gig PC3-10600 ram in each slot. It came populated with 4gig of ram.
I'll attach the specs on it direct from the manufacturer (the whole user manual from their site). You can find the Win7/XP drivers for it on the Advantech site as well:
Advantech ARK-DS262 Driver Page
One the key factors with this device is that it connects to all the peripherals (except the LAN) via an Intel OPS port. Also attached is the doc from Intel describing the OPS port and it's pinouts, should you want to try to connect something else to this port. You can purchase the male/female connectors from most major electronics suppliers (Digikey, Mouser, etc.). It is a JAE TX24A/25A Connector. The 25A is the male, and the 24A is the female.
Digikey link to female connector
Digikey link to male connector
I haven't tested it, but its likely that this can be replaced by any other PC that supports the Intel OPS (Open Pluggable Specification) connector. (also knows as a JAE TX25-80P-LT-H1E connector) As noted above, Viewsonic has several models. But they're prohibitively expensive. There are several other manufacturers that make these same style PCs, usually listed for digital signage. NEC seems to have a few models that are much better priced, at least as far as ebay prices go in July of 2023. I'm looking at units for $100-250, which is a lot better than $1,400 for a Viewsonic. The specs aren't that great, but you can probably find a decent i7 unit for under $300 (used, of course).
And if you're not planning an all-out replacement of the whole PC, then maybe upgrades are more your speed. My SMART Table 442i came with only 4gb of ram. It takes SODIMMs with DDR3, PC3-10600. I
THOUGHT it supported 16gb of RAM - that's what Advantec's manual says, but it does NOT support 16gb, only 8gb. So save yourself a few bucks and get one 4gb SODIMM instead of two 8's.
The manual says that it supports SATA HDD of a max height of 9.5mm. I don't see why an SSD wouldn't work. I'm thinking for the low price of about $60, I can throw 16 gig of ram and an SSD into it and make it a little snappier. Sure, that won't help the low CPU speed, but unless I want to try to solder a new CPU onto the motherboard, that's about as much as I can do without replacing the whole unit.
I plan to upgrade it to Win10, but we'll see how the ram and SSD upgrade goes first. It sounds like an in-place upgrade to Win10 is the way to go. I'll image the original 500gig HDD first, though, just in case.