You probably saw the early 4400-specific model. Those were huge, roughly 2x taller than the later 64*54 models, and AFAIK only available at 240MHz. The 64*54 would probably work in a 4400 or other Tanzania clone but it's designed to be smaller to fit comfortably in the Alchemy models. They're a good choice to use in a Power Color Classic mod since they don't require you to cut away the chassis to fit unlike the taller Sonnet cards.
Alright so the 2300dn definitely works with 8.6. I’m gonna use it over a network though so not sure that even matters. As far as I know there is a ppd file for it which works with the LaserWriter 8 driver.
I’ve always disabled all printing extensions on my systems so now I wonder which of them I’ll need to enable. I’ll be printing over a network, if that helps.
It's something in the soft power circuitry that is supposed to have a combination of semiconductors to pass off the power on signal voltage from the 6v PRAM battery to the PSU Power On pin until it's turned off, when the computer sends a "power off" signal to it and cuts the voltage from the PSU to the PSU Power On pin.
I’m also looking at a cheaper 2300dn that Cory mentioned. That’ll save me some $$$. Gonna do some research and see if I can find out if they’ll work with OS8.6. It’ll work with OS9 for sure but I run OS8.6. I guess that compatibility is only if you intend to use the provided software though, and I believe I’ll be doing it differently. Never printed stuff on an old Mac yet, still have a little to learn. But as long as I can print two-sided pages over a network to a 2300 series from OS8.6 I’ll be happy.