| Register | Description |
| X | The X Register is primarily used to load a 16-bit wide value from two 8-bit values. The lower byte of the X Register can be accessed through the 8-bit wide XL Register, and the upper byte of the X Register can be accessed through the 8-bit wide XH Register. |
| M | The M Register stores the 16-bit wide memory address when data is accessed from the SRAM memory through the LOAD and STORE instructions. |
| J | The J register stores the 16-bit wide memory address of the new Program Counter when performing conditional (JZ, JNS, JNC, JNZ) and unconditional jumps (JMP). |
| Y | A General Purpose Register that can store 16-bit of data. |
| Z | A General Purpose Register that can store 16-bit of data. |
| BP | The Base Pointer, which is used during Stack operations. |
| SP | The Stack Pointer, which is used during Stack operations. |
| PC | The Program Counter, which stores the memory address of the next instruction to execute. It is incremented during the Fetch- and Increment Cycle. |