is there a dot matrix printer that works with iMac

No insight. But you maybe trying to bridge two eras of computing that simply arn't meant to be bridged. Are you certain a dot matrix printer is essential to your needs?

The Epson Networking Impact Printers are designed for high capacity environments and are Mac OS compatible. The IP networking printer drivers built into Mac OS X support the IP Network dot matrix printers, both 9 & 24 pin.

For example, for the FX-890N Networking printer you can use the driver "Epson 9-Pin Series" as shown below:

Epson's full-featured, FX-890N Networking printer offers the durability and ease of use required for essential daily printing. This 9-pin, dot-matrix, narrow-carriage workhorse boasts an MTBF rating of 20,000 power-on hours (POH) and speeds of up to 680 cps (characters per second). Engineered for seamless integration, the FX-890N's interfaces include an internal 10/100 Base-TX Ethernet print server with support for Macintosh OS X.

Its easy-to-install 7.5 million-character ribbon cartridge boosts productivity and ensures a low cost per page, while its 400 million-character print-head life heightens its dependability. Included Epson Remote Configuration Manager software simplifies printer setup and setting selection. Ideal for rugged environments, the printer is a perfect drop-in replacement for the Epson FX-880/880+/980 or Okidata Microline 320/320 Turbo. It handles forms up to seven parts thick via four convenient paper paths, and its redesigned control panel features a lock-out mode and other intuitive functions. The printer is Novell tested and approved and is backed by Epson's comprehensive three-year warranty with technical support. The Epson FX-890N offers the durability and ease of use required for criticaldaily print requirements. Speeds through multipart forms,reports, labels and more at up to 680cps.Offers an MTBF rating of 20,000 POH and a 400 million character print head life.. Includes 10/100Base-TX Ethernet Interface for easy networking.

Printing Method: 9-pin, impact dot matrix

Print Speed:

• Ultra Speed Draft: 680 cps (12 cpi); 566 cps (10 cpi)
• High Speed Draft: 559 cps (10 cpi)
• Draft: 419 cps (10 cpi)
• Near Letter Quality: 104 cps (10 cpi)

Characters & Lines

Character Sets:

• 13 character tables
• 13 international character sets

Resident Bitmapped Fonts:

• Ultra Speed Draft: 10, 12 cpi
• High Speed Draft: 10, 12, 15, 17, 20 cpi
• Draft: 10, 12, 15, 17, 20 cpi
• Near Letter Quality (Roman / Sans Serif): 10, 12, 15, 17, 20 cpi, proportional

Bar Code Fonts: EAN-13, EAN-8, Interleaved 2 of 5, UPC-A, UPC-E, Code 39, Code 128, POSTNET, Codabar (NW-7), Industrial 2 of 5, Matrix 2 of 5Characters per Line: 80 characters at 10 cpi

Line Spacing: 6 lines per inch defaultFormatting:

• 1/6-inch or programmable in 1/432-inch increments
• 8 lpi option available on FX-890 Okidata Mode only

Paper Handling

Forms: Continuous multipart, original plus 6 carbonless copies, 1 + 6 copies with pull tractor, maximum thickness .018"Envelopes:

• No. 6 envelopes: 6.5" x 3.6"
• No. 10 envelopes: 9.5" x 4.1"

Width:

• Single sheets: 3.9" to 10.1"
• Continuous: 4" to 10"
• Cut-sheet feeder: 7.2" to 8.5"

Length:

• Single sheets: 3.9" to 14.3"
• Continuous: 4" to 22"
• Cut-sheet feeder: 10.1" to 14"

Labels: Minimum: 2.5" x 0.94"Roll paper: 8.5" width

Paper Feed Speed:

• 62 millisecond per 1/6"
• 5" per second, continuous feed

Paper Path:

• Manual insertion: Front or rear in, top out
• Cut sheet feeder: Top in, top out
• Tractor: Front, rear or bottom in, top out
• Pull push tractor: Front or rear in, top out

General

Printer Language :

• Epson ESC / P
• IBM PPDS
• Okidata Microline (FX-890 Okidata Mode only)

IP Networking Interface:

EpsonNet 10 / 100Base-TX Ethernet Print Server

Input Buffer : 128 KB

Control Panel: Functions: Font, pitch, pause, tear off, bin selection, line feed, form feed, load, eject, micro adjust, top-of-form adjustment, panel lockout, reset, menu, default setting selection

Sound Level : 55 dB(A) (ISO 7779 pattern)

Rated frequency range : 50 – 60 Hz

Input frequency range : 49.5 – 60.5 Hz

Dimensions : 16.3" x 13.8" x 6.6" (W x D x H)