CCS is case insensitive by default, so

port_B == PoRt_b.

 Don't be like me and develop bad habits with a case insensitive compiler,
try to be consistent about capitalization.

Yes, you need to explicilty define port_b.

#byte port_b = 6

and also, you've defined "value" as a long.  You may get unexpected results
by assigning a port (8 bit) to a long (16 bit in CCS).

If you explicitly state in your include file,

 #DEVICE pic16f877 ADC=10

then read_ADC() will give you a long, packed with the two most signifigant
bits in the upper byte.    To convert the 10-bit value to 8 bits you may
need to shift right twice to truncate it to 8 bits.

--Lawrence

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