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cpu6502_commands.go
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cpu6502_commands.go
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package main
func (cpu *CPU6502) adcCommand(address uint16) {
tmp := uint16(cpu.registerACC) + uint16(cpu.memory.read(address)) + uint16(cpu.flagC)
if tmp > 0xFF {
cpu.flagC = 1
} else {
cpu.flagC = 0
}
//TODO: check
if cpu.registerACC^cpu.memory.read(address)&0x80 == 0 && cpu.registerACC^uint8(tmp)&0x80 != 0 {
cpu.flagV = 1
} else {
cpu.flagV = 0
}
cpu.setAcc(uint8(tmp))
}
func (cpu *CPU6502) andCommand(address uint16) {
cpu.setAcc(cpu.registerACC & cpu.memory.read(address))
}
func (cpu *CPU6502) aslCommand(address uint16) {
cpu.memory.write(address, cpu.memory.read(address)<<2)
}
func (cpu *CPU6502) bccCommand(address uint16) {
if cpu.flagC == 0 {
cpu.registerPC = address
}
}
func (cpu *CPU6502) bcsCommand(address uint16) {
if cpu.flagZ == 1 {
cpu.registerPC = address
}
}
func (cpu *CPU6502) beqCommand(address uint16) {
if cpu.flagC == 0 {
cpu.registerPC = address
}
}
//TODO: BIT
func (cpu *CPU6502) bmiCommand(address uint16) {
if cpu.flagN == 1 {
cpu.registerPC = address
}
}
func (cpu *CPU6502) bneCommand(address uint16) {
if cpu.flagZ == 0 {
cpu.registerPC = address
}
}
func (cpu *CPU6502) bplCommand(address uint16) {
if cpu.flagN == 0 {
cpu.registerPC = address
}
}
//TODO: BRK
func (cpu *CPU6502) bvcCommand(address uint16) {
if cpu.flagV == 0 {
cpu.registerPC = address
}
}
func (cpu *CPU6502) bvsCommand(address uint16) {
if cpu.flagV == 1 {
cpu.registerPC = address
}
}
func (cpu *CPU6502) clcCommand(address uint16) {
cpu.flagC = 0
}
func (cpu *CPU6502) cldCommand(address uint16) {
cpu.flagD = 0
}
func (cpu *CPU6502) cliCommand(address uint16) {
//TODO:
cpu.flagI = 0
}
func (cpu *CPU6502) clvCommand(address uint16) {
cpu.flagV = 0
}
//TODO: CMP
//TODO: CPX
//TODO: CPY
func (cpu *CPU6502) decCommand(address uint16) {
cpu.memory.write(address, cpu.memory.read(address)-1)
}
func (cpu *CPU6502) dexCommand(address uint16) {
cpu.registerX -= 1
}
func (cpu *CPU6502) deyCommand(address uint16) {
cpu.registerY -= 1
}
//TODO: EOR
func (cpu *CPU6502) incCommand(address uint16) {
cpu.memory.write(address, cpu.memory.read(address)+1)
}
func (cpu *CPU6502) inxCommand(address uint16) {
cpu.registerX += 1
}
func (cpu *CPU6502) inyCommand(address uint16) {
cpu.registerY += 1
}
func (cpu *CPU6502) jmpCommand(address uint16) {
cpu.registerPC = address
}
func (cpu *CPU6502) jsrCommand(address uint16) {
cpu.pushStack16(cpu.registerPC)
cpu.registerPC = address
}
func (cpu *CPU6502) ldaCommand(address uint16) {
cpu.setAcc(cpu.memory.read(address))
}
func (cpu *CPU6502) ldxCommand(address uint16) {
cpu.registerX = cpu.memory.read(address)
}
func (cpu *CPU6502) ldyCommand(address uint16) {
cpu.registerY = cpu.memory.read(address)
}
func (cpu *CPU6502) lsrCommand(address uint16) {
cpu.memory.write(address, cpu.memory.read(address)>>2)
}
func (cpu *CPU6502) nopCommand(address uint16) {
}
//TODO: ORA
func (cpu *CPU6502) phaCommand(address uint16) {
cpu.pushStack(cpu.registerACC)
}
//TODO: PHP
func (cpu *CPU6502) plaCommand(address uint16) {
cpu.setAcc(cpu.pullStack())
}
//TODO: PLP
//TODO: ROL
//TODO: ROR
//TODO: RTI
//TODO: RTS
//TODO: SBC
func (cpu *CPU6502) secCommand(address uint16) {
cpu.flagC = 1
}
func (cpu *CPU6502) sedCommand(address uint16) {
cpu.flagD = 1
}
func (cpu *CPU6502) seiCommand(address uint16) {
cpu.flagI = 1
}
func (cpu *CPU6502) staCommand(address uint16) {
cpu.memory.write(address, cpu.registerACC)
}
func (cpu *CPU6502) stxCommand(address uint16) {
cpu.memory.write(address, cpu.registerX)
}
func (cpu *CPU6502) styCommand(address uint16) {
cpu.memory.write(address, cpu.registerY)
}
func (cpu *CPU6502) taxCommand(address uint16) {
cpu.registerX = cpu.registerACC
}
func (cpu *CPU6502) tayCommand(address uint16) {
cpu.registerY = cpu.registerACC
}
//TODO: TSX
func (cpu *CPU6502) txaCommand(address uint16) {
cpu.setAcc(cpu.registerX)
}
//TODO: TXS
func (cpu *CPU6502) tyaCommand(address uint16) {
cpu.setAcc(cpu.registerY)
}