type Byte { built-in type }
Byte is an unsigned integer type which is one “unit” wide. On most platforms one unit has 8 bits, therefore the type is named “byte” and usually has a range of 0 .. 255. (It is the same as ByteCard.)
Byte in GNU Pascal is compatible to unsigned char in GNU C.
There are lots of other integer types in GPC, see Integer Types.
Byte is a Borland Pascal extension. (For something equivalent in ISO Pascal, see Subrange Types.)
program ByteDemo; var a: Byte; begin a := 42; WriteLn (a) end.