mirror of https://github.com/lefticus/6502-cpp.git
94 lines
3.3 KiB
C++
94 lines
3.3 KiB
C++
#ifndef INC_6502_C_C64_HPP
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#define INC_6502_C_C64_HPP
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#include "../personality.hpp"
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struct C64 : Personality
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{
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void insert_autostart_sequence(std::vector<mos6502> &new_instructions) const override
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{
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constexpr static auto start_address = 0x0801;
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// first 2 bytes is the load address for a PRG file.
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new_instructions.emplace_back(ASMLine::Type::Directive, ".word " + std::to_string(start_address));
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new_instructions.emplace_back(ASMLine::Type::Directive, "* = " + std::to_string(start_address));
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new_instructions.emplace_back(ASMLine::Type::Directive, "; jmp to start of program with BASIC");
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new_instructions.emplace_back(ASMLine::Type::Directive, ".byt $0B,$08,$0A,$00,$9E,$32,$30,$36,$31,$00,$00,$00");
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}
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[[nodiscard]] Operand get_register(const int reg_num) const override
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{
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switch (reg_num) {
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// http://sta.c64.org/cbm64mem.html
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case 0:
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return Operand(Operand::Type::literal, "$a7");// bit buffer for rs232
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case 1:
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return Operand(Operand::Type::literal, "$a8");// counter for rs232
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case 2:
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return Operand(Operand::Type::literal, "$05");// unused, int->fp routine pointer
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case 3:
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return Operand(Operand::Type::literal, "$06");
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case 4:
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return Operand(Operand::Type::literal, "$fb");// unused
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case 5:
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return Operand(Operand::Type::literal, "$fc");// unused
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case 6:
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return Operand(Operand::Type::literal, "$fd");// unused
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case 7:
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return Operand(Operand::Type::literal, "$fe");// unused
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case 8:
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return Operand(Operand::Type::literal, "$22");// unused
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case 9:
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return Operand(Operand::Type::literal, "$23");// unused
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case 10:
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return Operand(Operand::Type::literal, "$39");// Current BASIC line number
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case 11:
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return Operand(Operand::Type::literal, "$3a");// Current BASIC line number
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case 12:
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return Operand(Operand::Type::literal, "$61");// arithmetic register #1
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case 13:
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return Operand(Operand::Type::literal, "$62");
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case 14:
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return Operand(Operand::Type::literal, "$63");
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case 15:
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return Operand(Operand::Type::literal, "$64");
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case 16:
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return Operand(Operand::Type::literal, "$65");
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case 17:
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return Operand(Operand::Type::literal, "$69");// arithmetic register #2
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case 18:
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return Operand(Operand::Type::literal, "$6a");
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case 19:
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return Operand(Operand::Type::literal, "$6b");
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case 20:
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return Operand(Operand::Type::literal, "$6c");
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case 21:
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return Operand(Operand::Type::literal, "$6d");
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case 22:
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return Operand(Operand::Type::literal, "$57");// arithmetic register #3
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case 23:
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return Operand(Operand::Type::literal, "$58");
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case 24:
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return Operand(Operand::Type::literal, "$59");
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case 25:
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return Operand(Operand::Type::literal, "$5a");
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case 26:
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return Operand(Operand::Type::literal, "$5b");
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case 27:
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return Operand(Operand::Type::literal, "$5c");// arithmetic register #4
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case 28:
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return Operand(Operand::Type::literal, "$5d");
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case 29:
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return Operand(Operand::Type::literal, "$5e");
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case 30:
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return Operand(Operand::Type::literal, "$5f");
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case 31:
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return Operand(Operand::Type::literal, "$60");
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}
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throw std::runtime_error("Unhandled register number: " + std::to_string(reg_num));
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}
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};
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#endif//INC_6502_C_C64_HPP
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