Epson ES-1200C - Manual (Page 82)

Halftoning mode A mode B
C NOW
Dither pattern A
Halftone is expressed in 4 by 4 bayer dither pattern.
Dither pattern B
Halftone is expressed in 4 by 4 spiral pattern.
Dither pattern C
Halftone is expressed in 4 by 4 net screen dither pattern.
Dither pattern D
Halftone is expressed in 8 by 4 net screen dither pattern.
Appendix A-11