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

hainesr · Oct 30, 2020 · b8698dd · b8698dd
1 parent a35041c
commit b8698dd
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diff --git a/lib/mos6502/cpu_illegal_instructions.rb b/lib/mos6502/cpu_illegal_instructions.rb
@@ -113,6 +113,11 @@ def illegal_instructions
           absolute(@x)
         },
 
+        # RLA (ROL + AND) (absolute, X)
+        0x3f => lambda {
+          rla(absolute(@x))
+        },
+
         # NOP (zero page)
         0x44 => lambda {
           zero_page

diff --git a/test/cpu_illegal_acc_ops_test.rb b/test/cpu_illegal_acc_ops_test.rb
@@ -82,6 +82,7 @@ def test_absolute_x
     # 0x33 <OP> 0xcc
     [
       [0x1f, 0xbb, 0x98, true, false, true, false],   # SLO
+      [0x3f, 0x10, 0x98, false, false, true, false],  # RLA
       [0xdf, 0x33, 0xcb, false, false, false, false], # DCP
       [0xff, 0x65, 0xcd, false, false, false, false]  # ISC
     ].each do |opcode, a, mem, negative, zero, carry, overflow|