# Glossary

Here are some definitions of the most commonly used terms throughout the tutorial. For the sake of context and continuity, it's best read from top to bottom.

| Terminology           | Definition                                                                                                                         |
| --------------------- | ---------------------------------------------------------------------------------------------------------------------------------- |
| SNES                  | Super Nintendo Entertainment System                                                                                                |
| Memory                | The working space in the SNES in which the ROM, RAM and SRAM are present                                                           |
| ROM                   | Read-only memory; the well-known .smc/.sfc/.fig files                                                                              |
| (W)RAM                | (Work) Random-access memory                                                                                                        |
| SRAM                  | Static random-access memory; the well-known .srm files                                                                             |
| Register              | A variable in the SNES not part of the standard SNES memory                                                                        |
| Opcode                | A three-letter instruction; a mnemonic                                                                                             |
| Addressing mode       | An optional parameter for an opcode denoting a value or an address                                                                 |
| Instruction/Operation | The combination of an opcode and optionally an addressing mode                                                                     |
| Machine code          | An instruction assembled into bytes, which can be understood by processors                                                         |
| Value                 | A magnitude, quantity, or number; a number representing information                                                                |
| Signed                | A value that semantically allows itself to be negative as well                                                                     |
| Unsigned              | A value that semantically allows itself to be positive-only, allowing for greater positive numbers                                 |
| Address               | A location in the memory of the SNES. Ranges from $000000 to $FFFFFF                                                               |
| Long address          | An address represented by a 6-digit hexadecimal notation (e.g. $001200)                                                            |
| Absolute address      | An address represented by a 4-digit hexadecimal notation of the final 4 digits (e.g. $1200)                                        |
| Direct page           | An address represented by a 2-digit hexadecimal notation of the final 2 digits (e.g. $00)                                          |
| Byte                  | An 8-bit value                                                                                                                     |
| Word                  | A 16-bit value                                                                                                                     |
| Long                  | A 24-bit value                                                                                                                     |
| Double                | A 32-bit value                                                                                                                     |
| Bank byte             | The first two digits of a long address or a long value (e.g. "$12" in $**12**3456)                                                 |
| High byte             | The middle two digits of a long address, absolute address, long value or word value (e.g. "$34" in both $12**34**56 and $**34**56) |
| Low byte              | The final two digits of a long address, absolute address, long value or word value (e.g. "$56" in both $1234**56** and $34**56**)  |


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