Changes
Z80
,/* Internal state */
| IFF2 || 1-bit || IFF1 buffer || Allows interrupts to be enabled after the instruction following EI
|-
| WZ || 16-bit || Internal temporary register pair . Also known as MEMPTR || Used for memory and address calculations
|-
| IR (Instruction Register) || 8-bit || Holds the opcode of the currently executing instruction || Internally used, not accessible by the programmer
