C←DATA SEGMENT ←rb DB 144 DUP (0) ←tb DB 144 DUP (0) ←busy DW 2 DUP (0) ←iretCode DW 1 DUP (0) ; External Data Declared Elsewhere C←DATA ENDS ; External Functions Declared Elsewhere EXTRN ←Block:NEAR EXTRN ←EnableInt:NEAR EXTRN ←CallDebugger:NEAR EXTRN ←InitRingBuffer:NEAR EXTRN ←WriteRingBuffer:NEAR EXTRN ←RingBufferEmpty:NEAR EXTRN ←ReadRingBuffer:NEAR EXTRN ←OutByte:NEAR EXTRN ←InByte:NEAR EXTRN ←DoEOI:NEAR ; 0 errors in compilation.