Description:	Select the greater of two positive 4-bit values.
Input:	Two values (A and B) entered from the front panel
Output:	The greater of A and B is displayed on the output lamps.
Written by:	bhilpert (2006 Sep)
Assembled:	Ref Tape Assembly --- -------- -------------------------------------------------- 000: 12.10.00 SR1=* / wait for first value (A) 001: 03.00.01 SR2=^ / save high bits as well 002: 14.10.00 SR3=* / wait for second value (B) 003: 05.00.01 SR4=^ 004: 08.00.04 CR1=SR3 / negate B 005: 1B.01.00 NEG / and save in SR5 & 6 006: 06.00.0C SR5=CR5 007: 08.00.05 CR1=SR4 008: 1B.09.00 NGC 009: 07.00.0C SR6=CR5 010: 18.00.00 CR1=0 / save carry (5th bit) in CR3 011: 19.00.00 CR2=0 012: 1B.08.00 ADC 013: 0A.00.0C CR3=CR5 014: 08.00.02 CR1=SR1 / subtract: A + -B 015: 09.00.06 CR2=SR5 016: 1B.00.00 ADD 017: 08.00.03 CR1=SR2 018: 09.00.07 CR2=SR6 019: 1B.08.00 ADC 020: 08.00.0A CR1=CR3 021: 19.00.00 CR2=0 022: 1B.08.00 ADC / result = B>A 023: 0A.00.0C CR3=CR5 / move result to CR3 024: 08.00.02 CR1=SR1 / select lower bits 025: 09.00.04 CR2=SR3 / for display 026: 1B.03.00 SEL 027: 0D.00.0C OR1=CR5 028: 08.00.03 CR1=SR2 / select upper bits 029: 09.00.05 CR2=SR4 / for display 030: 1B.03.00 SEL 031: 0E.00.0C OR2=CR5