My parents used to own a LaserJet 4M plus, which had PostScript built in. I played around with it once I figured out the possibilities.

It had all of 2MB memory originally, which was a real bottleneck in its later days. I did add 16MB at some point, to increase its life. From then on, when using PostScript instead of PCL for printing, it was clearly CPU-bound.

I’m still conflicted about them taking it to recycling even though it worked reliably. It was over 20 years old.

A good printer should never sent to the trash, because newer ones aren't built as good, unless you get a SMB device.

I've given away my first Samsung laser, because it's pickup rollers just eroded away. The second one is a much beefier machine, and going really strong. I'm just stocking toner and imaging unit refills for that, because If I can use it for another 8 years, it'd be a really great win for me.

I’m also user of 4Mp and even it’s manufactured in 1994 it’s still fantastic device

I bought my 6P new and still use it with a JetDirect box. Over the years, I saved another 6P from the bulk trash in my neighborhood and recently picked up a 6MP off Craigslist free. Both have a lower page count than my original and usable toner cartridges.