Implement RLA (ROL + AND) (absolute, Y).

hainesr · Oct 30, 2020 · a35041c · a35041c
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diff --git a/lib/mos6502/cpu_illegal_instructions.rb b/lib/mos6502/cpu_illegal_instructions.rb
@@ -103,6 +103,11 @@ def illegal_instructions
         # NOP (implied)
         0x3a => lambda {},
 
+        # RLA (ROL + AND) (absolute, Y)
+        0x3b => lambda {
+          rla(absolute(@y))
+        },
+
         # NOP (absolute, X)
         0x3c => lambda {
           absolute(@x)

diff --git a/test/cpu_illegal_acc_ops_test.rb b/test/cpu_illegal_acc_ops_test.rb
@@ -110,6 +110,7 @@ def test_absolute_y
     # 0x33 <OP> 0xcd
     [
       [0x1b, 0xbb, 0x9a, true, false, true, false],   # SLO
+      [0x3b, 0x12, 0x9a, false, false, true, false],  # RLA
       [0xdb, 0x33, 0xcc, false, false, false, false], # DCP
       [0xfb, 0x64, 0xce, false, false, false, false]  # ISC
     ].each do |opcode, a, mem, negative, zero, carry, overflow|