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+\ #requires tester-amforth.frt
+
+TESTING VM Register A
+hex
+
+\ ------------------------------------------------------------------------
+TESTING basic assumtions
+
+variable atest 10 allot
+atest >a
+
+0 constant false
+-1 constant true
+
+$55aa constant pattern
+
+
+{ a> atest = -> true }
+{ pattern a! -> }
+\ address must not change
+{ a> atest = -> true }
+{ a@ pattern = -> true }
+\ address must not change
+{ a> atest = -> true }
+
+TESTING address changes.
+{ pattern a!+ -> }
+\ address must increase by 1 cell
+{ a> atest cell+ = -> true }
+
+{ pattern a!- -> }
+\ address must decrease by 1 cell
+{ a> atest = -> true }
+
+{ a@+ pattern = -> true }
+\ address must increase by 1 cell
+{ a> atest cell+ = -> true }
+
+{ a@- pattern = -> true }
+\ address must decrease by 1 cell
+{ a> atest = -> true }