Canon PC1000s Service Manual page 72

CHAPTER 2 USING THE MACHINE
A
Do not use the following, reserved for the future: No. 001,007,008,012,
014,023,026,029 through 080.
#4A SPECIAL
#4B NCU
#4C ISDN
#4A SPECIAL
Do not change the setting.
#4B NCU (NCU setting)
The settings under this item are collectively and automatically set in conjunction with
#5
TYPE
to suit the communications standards of a specific countrylregion.
Not used. (Do not change the setting.)
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COPYRlGHT(D2002 CANON INC.
CANON PCIOCnMmageCLASS D600s REV. 1 AUG.2002