I have 6 Laserjet 4's. This is just the '4', plain vanilla machine. I have 5 J2552a and J2550a jet direct
cards for the machines.
The printers work fine if hooked up direct to the computer printer parallel port.
The Jetdirect cards work fine in my LaserJet 4+, 4M, and 4M+ printers of which I...
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