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operands greater than 9f

Oct 12, 2016 at 9:15 PM
I generate a syntax error very time I have an operand greater than 9f with any immediate command or 9fff with an lxi command. It seems as if a character (a-f) in the high nibble causes trouble. No problems with characters in any other position. Tried all combos of upper and lower cases and following with "h"

Something simple I am sure but what?

Nice program. I like the simple interface and would love to use it in an intro to microprocessors course. Thank you for creating it.