mirror of https://github.com/mre/mos6502.git
49 lines
1.4 KiB
Rust
49 lines
1.4 KiB
Rust
extern crate mos6502;
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use mos6502::cpu;
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use mos6502::instruction::Nmos6502;
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use mos6502::memory::Bus;
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use mos6502::memory::Memory;
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fn main() {
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println!("Enter two numbers (< 128) separated by a space to know their GCD.");
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let mut input = String::new();
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std::io::stdin().read_line(&mut input).unwrap();
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let zero_page_data = input
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.split_whitespace()
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.map(|s| s.parse::<u8>().unwrap())
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.collect::<Vec<u8>>();
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let program = [
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// (F)irst | (S)econd
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// .algo
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0xa5, 0x00, // Load from F to A
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// .algo_
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0x38, // Set carry flag
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0xe5, 0x01, // Substract S from number in A (from F)
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0xf0, 0x07, // Jump to .end if diff is zero
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0x30, 0x08, // Jump to .swap if diff is negative
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0x85, 0x00, // Load A to F
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0x4c, 0x12, 0x00, // Jump to .algo_
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// .end
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0xa5, 0x00, // Load from S to A
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0xff, // .swap
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0xa6, 0x00, // load F to X
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0xa4, 0x01, // load S to Y
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0x86, 0x01, // Store X to F
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0x84, 0x00, // Store Y to S
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0x4c, 0x10, 0x00, // Jump to .algo
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];
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let mut cpu = cpu::CPU::new(Memory::new(), Nmos6502);
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cpu.memory.set_bytes(0x00, &zero_page_data);
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cpu.memory.set_bytes(0x10, &program);
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cpu.registers.program_counter = 0x10;
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cpu.run();
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println!("GCD is {}", cpu.registers.accumulator);
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}
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