Modify the design of an 8-bit input port so that the port is 16 bitswide (lower 8 at port 9C and upper 8 at 9D).
Modify the CHARIN and CHAROUT routines so that bit
shift/rotate instructions are used in place of AND to check
the status.
Modify the TVT program so that all characters including the
carriage return are stored in a buffer pointed to by
register BP. The length of the buffer (not to exceed 255
characters) is returned in CL. When carriage return is hit,
or when the buffer is full, call the far routine SCANBUFF.
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