2020-07-24 17:13:46 +00:00
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[< back to index](../doc_index.md)
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# Differences in assembly
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## Syntax
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* High and low bytes of an 16-bit value are acquired using the `hi` and `lo` functions, not the `>` and `<` operators.
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* Anonymous labels and local labels are not supported.
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All labels defined in assembly are global.
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Colons are required in label declarations.
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* Macros are inserted using the `+` operator.
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* Raw bytes are inserted using the Millfork array syntax, not with any pseudoopcode (like `!byte`, `db` or `fcb`)
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* Assembly blocks cannot contain definitions of constants or variables.
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* 6502: To enforce zero-page addressing, wrap the argument in the `lo` function: `lo(arg)`
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* 6502: To enforce absolute addressing, add a 16-bit zero to the argument: `0000 + arg`
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* GameBoy: The $FF page loads/stores are written `LDH (C),A`, not `LD ($FF00+C),A`.
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* GameBoy: The loads/stores that postincrement/postdecrement HL write the HL register as `HLI` or `HLD`, not `HL+` or `HL-`
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* Z80: Indexing using the index register uses the `IX(1)` syntax, not `(IX+1)` or `1(IX)`.
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* Z80: Most undocumented instructions are not supported. The only one supported is `SLL`.
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* 6809: `0,X` is assembled the same as `,X`.
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2020-07-30 23:57:10 +00:00
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* 6502: To enforce direct-page addressing, prepend the argument with `<`: `<arg`.
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2020-07-24 17:13:46 +00:00
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