Epson GT-6500 EN - Manual (Page 187)

Gamma correction (ESC Z command)
Setting SW 5 SW 6
CRT Display A OFF OFF
CRT Display B ON OFF
Printer Output A OFF ON
Printer Output C ON ON
Halftoning mode (ESC B command)
Setting SW 7 SW 8
Disabled OFF OFF
Halftoning mode A ON OFF
Halftoning mode B OFF ON
Halftoning mode C ON ON
Scanner Model Technical Data B-5