Anyone recognize this S100-looking thing?

[Eudimorphodon]

I would also not assume that that slot is S-100 just because it's got a hundred pins. Plenty of machines used that 100-pin slot with other pinouts. Beep it out before trying to plug in an S-100 board!

Definitely a good point.

In favor of it being S-100 is there are pads on the board that appear to be marked for +16 and +8v feeds, per the standard, near the slot and the fat traces coming from them look like they’re landing on the right pins.

I will also be interested in further exploration....
I looked at the pictures, I can't find anything that looks like a clock source!
Did I miss it???

Yeah, that is… interesting. I suppose it could be using something janky like an R/C oscillator (like a Jolt 6502), but that seems really unlikely for something sophisticated enough to be using a CTC chip and DRAM controller.

If it was intended to be paired with a specific video card I wonder if they could have set it up so a clock is derived on the card and fed back through a pin on the bus connector.

 

[falter]

Just got this today - haven't had any time for vintage computing lately.

But I did dump the ROMs here. "Archives Monitor by James R King"

 

[KG7PFS]

I can't find it online, but there was an S-100 computer called "The Archive". (now you know why I can't find anything about it.) It had a 25-pin connector for the keyboard, a 37-pin connector, (I think) and one S-100 slot with a backplane. It was an "all in one", with the monitor and two disk drives in the main part and a detatchable keyboard. I don't remember how many boards were in the backplane, but I think both the disk controller and video board.

 

[Bruce Tomlin]

I just noticed this thread.

ROM is copied to RAM at startup
video character RAM seems to be 25x80 (2000 bytes) starting at E001
video attribute RAM seems to be at E801
(of course whether the video hardware is on the board or the missing card is another matter)

It also asks about booting from a 5 or 10 megabyte hard drive. Perhaps the missing card also had a hard disk controller.