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- 03:34, 2 June 2022 NovaSquirrel talk contribs created page Register sizes in ca65 (Created page with "When the 65c816's registers switch between being 8-bit and 16-bit, that affects how the processor expects instructions with immediate operands to be stored. For example, when the 65c816 encounters opcode <code>A9</code> (which is <code>LDA #value</code>) the current size of the accumulator determines if it will try to read one or two bytes after the opcode. This creates a problem for assemblers - they have to know whether to encode <code>LDA #1</code> as <code>A9 01</cod...")