Made for the Mac
HP Desk Writer 550C, Model C2124A, HP’s second “true” color printer with sharp, clear 300 x 300 dpi black and color resolution. Supports True Type Fonts, will print on transparencies and envelopes. Requires Mac System 6.0.7 or later.
As a general rule, DeskJet and DeskWriter printers prior to USB shared the same model numbers, DeskJets use a parallel connection and DeskWriters use a serial connection.
I have several early DeskWriter printers that are/will be available. I managed to find one good black cartridge amongst these and used it to test numerous printers. The DeskWriter 550C Printer looks great, has been cleaned and has successfully printed several pages in black with a borrowed cartridge. Manuals, software, power adapter/supply and Serial printer cable are included. No cartridges will be included, but can still be found and refilled. The black cartridge is HP 26 (51626A), and the color is HP 25 (51625A).