Epson GT-6500 EN - Manual (Page 196)

Gamma correction (ESC Z command)
Setting SW 2-3 SW 2-4 SW 2-5
CRT Display A OFF OFF OFF
CRT Display B ON OFF OFF
Printer Output A OFF ON OFF
Printer Output B ON ON OFF
Printer Output C OFF OFF ON
Color correction (ESC M command)
Setting SW 2-6 SW 2-7
Impact dot matrix printer OFF OFF
Thermal transfer printer ON OFF
Ink jet printer OFF ON
CRT Display ON ON
B-14 Scanner Model Technical Data