137 lines
4.9 KiB
C
137 lines
4.9 KiB
C
#ifndef _APPLE_I_OPCODES_H_
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#define _APPLE_I_OPCODES_H_
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#include "types.h"
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dw pc; // program counter
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db ac; // accumulator
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db x; // x register
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db y; // y register
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db sp; // stack pointer
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db sr; // status register
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db ir; // intruction register
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enum opcodes_table
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{ /// aaa00 aaa01 aaa10
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/* aaa *///================================================
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/* 000 */ ORA = 0b00001, ASL = 0b00010,
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/* 001 */ BIT = 0b00100, AND = 0b00101, ROL = 0b00110,
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/* 010 */ JMP = 0b01000, EOR = 0b01001, LSR = 0b01010,
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/* 011 */ JPA = 0b01100, ADC = 0b01101, ROR = 0b01110,
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/* 100 */ STY = 0b10000, STA = 0b10001, STX = 0b10010,
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/* 101 */ LDY = 0b10100, LDA = 0b10101, LDX = 0b10110,
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/* 110 */ CPY = 0b11000, CMP = 0b11001, DEC = 0b11010,
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/* 111 */ CPX = 0b11100, SBC = 0b11101, INC = 0b11110
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};
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enum opcodes_list
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{
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BRK = 0x00, BPL = 0x10, JSR = 0x20, BMI = 0x30, RTI = 0x40, BVC = 0x50,
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RTS = 0x60, BVS = 0x70, BCC = 0x90, BCS = 0xB0, BNE = 0xD0, BEQ = 0xF0,
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PHP = 0x08, CLC = 0x18, PLP = 0x28, SEC = 0x38, PHA = 0x48, CLI = 0x58, PLA = 0x68, SEI = 0x78,
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DEY = 0x88, TYA = 0x98, TAY = 0xA8, CLV = 0xB8, INY = 0xC8, CLD = 0xD8, INX = 0xE8, SED = 0xF8,
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TXA = 0x8A, TXS = 0x9A, TAX = 0xAA, TSX = 0xBA, DEX = 0xCA, NOP = 0xEA
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};
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enum address_mode
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{
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immediate = 0b000,
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zero_page = 0b001,
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accumulator = 0b010,
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absolute = 0b011,
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indirect_y = 0b100,
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zero_page_x = 0b101,
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absolute_y = 0b110,
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absolute_x = 0b111,
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indirect_x,
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zero_page_y
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};
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typedef enum opcodes_table oct;
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typedef enum opcodes_list ocl;
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typedef enum address_mode am;
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am address_mode;
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void adc(); // add memory to accumalator with carry
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void and(); // and memory with accumulator
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void asl(); // shift left one bit (memory or accumulator)
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void bcc(); // branch on carry clear
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void bcs(); // branch on carry set
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void beq(); // branch on result zero
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void bit(); // test bits in memory with accumulator
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void bmi(); // branch on result minus
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void bne(); // branch on result not zero
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void bpl(); // branch on result plus
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void brk(); // force break
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void bvc(); // branch on overflow clear
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void bvs(); // branch on overflow set
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void clc(); // clear carry flag
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void cld(); // clear decimal mode
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void cli(); // clear interrupt disable bit
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void clv(); // clear overflow flag
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void cmp(); // compare memory with accumulator
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void cpx(); // compare memory and index x
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void cpy(); // compare memory and index y
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void dec(); // decrement memory by one
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void dex(); // decrement index x by one
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void dey(); // decrement index y by one
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void eor(); // exclusive-or memory with accumulator
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void inc(); // increment memory by one
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void inx(); // increment index x by one
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void iny(); // increment index y by one
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void jmp(); // jump to new location (indirect)
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void jpa(); // jump to new location (absolute)
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void jsr(); // jump to new location saving return address
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void lda(); // load accumulator with memory
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void ldx(); // load index x with memory
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void ldy(); // load index y with memory
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void lsr(); // shift one bit right (memory or accumulator)
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void nop(); // no operation
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void ora(); // or memory with accumulator
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void pha(); // push accumulator on stack
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void php(); // push processor status on stack
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void pla(); // pull accumulator from stack
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void plp(); // pull processor status from stack
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void rol(); // rotate on bit left (memory or accumulator)
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void ror(); // rotate on bit right (memory or accumulator)
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void rti(); // return from interrupt
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void rts(); // retrun from subroutine
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void sbc(); // subtract memory from accumulator with borrow
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void sec(); // set carry flag
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void sed(); // set decimal flag
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void sei(); // set interrupt disable status
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void sta(); // store accumulator in memory
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void stx(); // store index x in memory
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void sty(); // store index y in memory
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void tax(); // transfer accumulator to index x
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void tay(); // transfer accumulator to index y
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void tsx(); // transfer stack pointer to index x
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void txa(); // transfer index x to accumulator
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void txs(); // transfer index x to stack pointer
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void tya(); // transfer index y to accumulator
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#define N_IS_SET (sr & 0b10000000) // negative
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#define N_SET sr = sr | 0b10000000
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#define N_UNSET sr = sr & 0b01111111
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#define V_IS_SET (sr & 0b01000000) // overflow
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#define V_SET sr = sr | 0b01000000
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#define V_UNSET sr = sr & 0b10111111
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#define B_IS_SET (sr & 0b00010000) // break
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#define B_SET sr = sr | 0b00010000
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#define B_UNSET sr = sr & 0b11101111
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#define D_IS_SET (sr & 0b00001000) // decimal mode
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#define D_SET sr = sr | 0b00001000
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#define D_UNSET sr = sr & 0b11110111
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#define I_IS_SET (sr & 0b00000100) // interrupt disabled
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#define I_SET sr = sr | 0b00000100
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#define I_UNSET sr = sr & 0b11111011
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#define Z_IS_SET (sr & 0b00000010) // zero
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#define Z_SET sr = sr | 0b00000010
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#define Z_UNSET sr = sr & 0b11111101
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#define C_IS_SET (sr & 0b00000001) // carry
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#define C_SET sr = sr | 0b00000001
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#define C_UNSET sr = sr & 0b11111110
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#endif
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