Didn't the Atari ST have a similarly unintelligent
laser printer?
I beleive so. The Acorn Archimedes did too. As did the PERQ (I speak from
experience in the last case..). AFAIK these wrre Canon CX-VDO printers --
basically a CX printer (think of the LBP-8A1, the HP Laserjet 1, rtc)
without a formatter board, and with a DC37 socket wired to the input of
the DC controller (Engine controller) PCB.
A similar internface, mostly backwrds compatible, was avaialle for the SX
printers (Laserjet II, etc). It was a PCB containing a few uffer chips
that mounted in place of the formatter PCB.
-tony