> For the complete documentation index, see [llms.txt](https://ersanio.gitbook.io/assembly-for-the-snes/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ersanio.gitbook.io/assembly-for-the-snes/the-fundamentals/glossary.md). # 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**) | --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://ersanio.gitbook.io/assembly-for-the-snes/the-fundamentals/glossary.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.