Old PS Level 1 printer not working (LaserJet 4M)

[Kevin O'Gorman]

Printing seems to generate Level 2 documents, although CUPS knows this is a LaserJet 4M, which was never capable beyond Level 1.  I get various errors, but they all boil down to that.  This printer still works, and still prints if I send a Level 1 PS file to it, or have enscript(1) do so.

I have no idea how to get cups to produce level 1 output.

Help?