This Okidata RS232C Serial Card is compatible with ML600 Series and newer versions (sold after May 2011) of existing printer models for the ML300 Turbo Series and ML400 Series Oki printers.
Compatible with the latest revision of each model. See part number 70012801 for the older ML320 / ML321 serial card for printers made before May 2011.Example Serial Number on Printer:
Part number 44455101 compatibility is based on the last two letters/numbers at the end of the serial number.
ML320 Rev. I0 and Higher
ML 321 Turbo Rev. I0 and Higher
ML420 Rev. E0 and Higher
ML421 Rev. E0 and Higher
ML620 All Revisions
ML621 All Revisions