Implement SRE (LSR + EOR) (absolute, X).

hainesr · Oct 31, 2020 · 6fe6049 · 6fe6049
1 parent 90b3c02
commit 6fe6049
Show file tree

Hide file tree

Showing 2 changed files with 6 additions and 0 deletions.
diff --git a/lib/mos6502/cpu_illegal_instructions.rb b/lib/mos6502/cpu_illegal_instructions.rb
@@ -166,6 +166,11 @@ def illegal_instructions
           absolute(@x)
         },
 
+        # SRE (LSR + EOR) (absolute, X)
+        0x5f => lambda {
+          sre(absolute(@x))
+        },
+
         # NOP (zero page)
         0x64 => lambda {
           zero_page

diff --git a/test/cpu_illegal_acc_ops_test.rb b/test/cpu_illegal_acc_ops_test.rb
@@ -86,6 +86,7 @@ def test_absolute_x
     [
       [0x1f, 0xbb, 0x98, true, false, true, false],   # SLO
       [0x3f, 0x10, 0x98, false, false, true, false],  # RLA
+      [0x5f, 0x55, 0x66, false, false, false, false], # SRE
       [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|