These printers use the C3909A cartridge:

HP 8000

HP LaserJet 5 SI

HP LaserJet 5 SI MOPIER

HP LaserJet 5 SI MX

HP LaserJet 5 SI NX

HP LaserJet 8000

HP LaserJet 8000 MFP

HP LaserJet 8000 DN

HP LaserJet 8000 N

HP LaserJet 8000 Series

HP Mopier 240

HP Mopier 240 Network MFP

HP Mopier 320 Network MFP

Burroughs-Unisys UDS 9624

Canon LBP 930

Canon LBP 930 EX

Canon LBP 930 EXN

Canon LBP 2460

Canon LBP WX

Canon LBP X

Canon P 550

Canon Series 5 SI

Canon Series 5 SIMX

Dataproducts DDS 24

Dataproducts DDS 24 T

Dataproducts Digital Document Server 24

DEC LN 24

Digital-DEC LN 24

Hitachi Beamstar M-324

Hitachi PC PL-2600

IBM 4324-001

IBM 4324-003

IBM 4324 Network Printer

IBM 4324 PS

IBM Network Printer 24

IBM NP 24 Network PTR 24

IBM Optra N model 240

IBM Optra N model 245

IBM UP 24 PS

Interface-Systems 9324

Interface-Systems 9624

Konica Print System 2425

Konica-Minolta Print System 2425

Lexmark 4040

Lexmark Optra N-240

Lexmark Optra N-245

Lexmark Optra N model 240

Lexmark Optra N model 245

Lexmark Optra N Pro

Lexmark Optra N Series

Mopier 8000

OCE 6535

QMS PrintSystem 2425

Source-Technologies ST 4024

TROY-Systems 624