QMS VMS Guia do Utilizador descarregar pdf (Página 101)

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Before transmitting data to the printer, the host computer adds an “off-

set value” of Octal 77 to each byte. When the printer receives each

byte it subtracts this offset and discards the eighth bit. The six least

significant of the remaining bits determine which pixels of the sixel

print.

For example, when it receives the byte 01001000, the printer sub-

tracts octal 77 from the byte which results in 00001001. Then it dis-

cards the eighth bit which results in 0001001. The printer prints the

pixels according to the six least significant bits.

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QMS VMS Guia do Utilizador Página 101