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+Register sizes / mappings
+-------------------------
+
+The A register is used as an example
+
+ MSB LSB
+ +--------+--------+--------+--------+--------+--------+--------+--------+
+ | RAX |
+ +--------+--------+--------+--------+--------+--------+--------+--------+
+ | EAX |
+ +--------+--------+--------+--------+
+ | AX |
+ +--------+--------+
+ | AH | AL |
+ +--------+--------+
+
+
+# TODO - calling conventions