read functions v3.1 book II section 4.5.1 p1071
|opcode| regs | memory | description |
-|------| -------------- | -----------------------| --------------------------- |
+|------|----------------|------------------------|-----------------------------|
|00000 | RT, RT+1 | mem(EA,s) | Fetch and Add |
|00001 | RT, RT+1 | mem(EA,s) | Fetch and XOR |
|00010 | RT, RT+1 | mem(EA,s) | Fetch and OR |
store functions
|opcode| regs | memory | description |
-|------| -----| ----------| --------------------------- |
+|------|------|-----------|-----------------------------|
|00000 | RS | mem(EA,s) | Store Add |
|00001 | RS | mem(EA,s) | Store XOR |
|00010 | RS | mem(EA,s) | Store OR |