Here's a photo from my Nikon D1 shot this morning. I hope you'll humor my use of a pet photo, but a jet black dog can be surprisingly difficult to photograph and he was also being well behaved this morning.
First of all, I shot these in RAW(.NEF). This is still the format used by Nikon cameras, although each camera has its own quirks and the RAW processor needs to have support for the specific camera model generating the files. I'll also mention that even though I have a couple of D1s, this is the main one I use, partially because I spent a lot of time setting it up. The camera feels very much like a digital Nikon F5, and rather than having full text menus, a lot of settings(or custom functions in Nikon speak) are handled as on the F5/F100 and you really need a "cheat sheet" to know what you're setting. Incidentally, that button along with the ISO button is right where you'd find it on an F5-under a little metal door behind the small LCD on the back toward the bottom of the camera. The ability to even record in RAW is toggled on/off by a custom function.
Apple Camera RAW is able to read/recognize the files in Monteray, although I'll also mention that I hate Photos as a RAW processor
Fortunately Lightroom also handles them fine
The final result...well it's okay but not really by 2022 standards. I'd not be ashamed to share it if I wanted to show someone a photo of my dog. Note too that this is nearly ideal light-it was morning light in the shade of the porch, so not contrasty like full sun but still plenty bright.
BTW, this is a full resolution file. If I tried to post one from one of my more modern cameras, the website would scream. This was also at base ISO, 200. I have this camera set to underexpose since CCDs do not handle blown highlights the way we're use to on a modern camera, and this is what the uncorrected image looked like(not the same photo, but taken a few seconds before, and I didn't feel like rolling back the edits when I realized I should include it in this post).
Even with my massaging, I feel like my iPhone still handled it better
The long and short of this-
The D1 was among the best available in 1999. I couldn't find an MSRP in a quick Google search, but I THINK Nikon has mostly kept their pro model pricing consistent through the digital area, which would have made it around $5K. That's assuming you could find one. I charged 3 batteries just to be able to use it, and one of the ones I charged wouldn't even power on the camera. These were dumped onto a 2gb Lexar CF card. Further, the only way to directly tether the camera to the computer is by Firewire. I can easily do it when I'm at my desk docked with my M1 MBP since I still use an Apple Thunderbolt Display that has a Firewire port, but otherwise you'd need a stack of dongles(TB3-TB2, TB-FW800, and then either a FW800-FW400 cable or an 800M-400F dongle).
There you have it.
I'll just be blunt too and say that if you're looking at a pre-2000 digital camera, don't expect results like this unless you're buying a top end Nikon, Canon, or Kodak(if I had a Kodak from this era it would probably beat this, but my oldest Kodak is a DCS 760 from maybe from 2001 or 2002). If this hadn't been a RAW file, I wouldn't have been able to rescue it to this extent from the first capture. This is a relatively huge APS-C sensor(~16mmx24mm) and nothing short of DSLRs used sensors that big in those days.
If I have time later this week, I'll see what other cameras of this general age I can easily access and see if I can post comparisons, probably of the same subject. I know I can get to one of my D2s(don't remember if it's the D2H or D2X-the D2X might not be totally fair as it is a relatively advanced CMOS sensor) but I'm hoping one of the D1Hs I have works. I MIGHT have a D100 and/or D1X I can show results from.
Also, again on all of these, 2gb card max. Fortunately CFs aren't that hard to find, but if you have to hunt for them stick to good brands. I have a few 1gb and 2gb microdrives, some of which work, but I don't trust them now. I do find the Toshibas generally more reliable than IBMs.