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path: root/src/devices/cpu/m6502/oxavix2000.lst
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# license:BSD-3-Clause
# copyright-holders:David Haywood
# xavix2000 opcodes (Super XaviX)

phy_imp
	read_pc_noinc();
	write_stack(SP, Y);
	dec_SP();
	prefetch();

phx_imp
	read_pc_noinc();
	write_stack(SP, X);
	dec_SP();
	prefetch();

plx_imp
	read_pc_noinc();
	read_stack(SP);
	inc_SP();
	X = read_stack(SP);
	set_nz(X);
	prefetch();

ply_imp
	read_pc_noinc();
	read_stack(SP);
	inc_SP();
	Y = read_stack(SP);
	set_nz(Y);
	prefetch();

clr_acc
	read_pc_noinc();
	A = 0;
	set_nz(A);
	prefetch();

dec_acc
	read_pc_noinc();
	A--;
	set_nz(A);
	prefetch();

not_acc
	read_pc_noinc();
	A = A ^ 0xff;
	set_nz(A);
	prefetch();

inc_acc
	read_pc_noinc();
	A++;
	set_nz(A);
	prefetch();

neg_acc
	read_pc_noinc();
	A = (0x00 - A) & 0xff;
	set_nz(A);
	prefetch();

oraj_imp
	read_pc_noinc();
	A |= m_j;
	set_nz(A);
	prefetch();

orak_imp
	read_pc_noinc();
	A |= m_k;
	set_nz(A);
	prefetch();

oral_imp
	read_pc_noinc();
	A |= m_l;
	set_nz(A);
	prefetch();

oram_imp
	read_pc_noinc();
	A |= m_m;
	set_nz(A);
	prefetch();

andj_imp
	read_pc_noinc();
	A &= m_j;
	set_nz(A);
	prefetch();

andk_imp
	read_pc_noinc();
	A &= m_k;
	set_nz(A);
	prefetch();

andl_imp
	read_pc_noinc();
	A &= m_l;
	set_nz(A);
	prefetch();

andm_imp
	read_pc_noinc();
	A &= m_m;
	set_nz(A);
	prefetch();

eorj_imp
	read_pc_noinc();
	A ^= m_j;
	set_nz(A);
	prefetch();

eork_imp
	read_pc_noinc();
	A ^= m_k;
	set_nz(A);
	prefetch();

eorl_imp
	read_pc_noinc();
	A ^= m_l;
	set_nz(A);
	prefetch();

eorm_imp
	read_pc_noinc();
	A ^= m_m;
	set_nz(A);
	prefetch();

adcj_imp
	read_pc_noinc();
	do_adc(m_j);
	prefetch();

adck_imp
	read_pc_noinc();
	do_adc(m_k);
	prefetch();

adcl_imp
	read_pc_noinc();
	do_adc(m_l);
	prefetch();

adcm_imp
	read_pc_noinc();
	do_adc(m_m);
	prefetch();

staj_imp
	read_pc_noinc();
	m_j = A;
	prefetch();

stak_imp
	read_pc_noinc();
	m_k = A;
	prefetch();

stal_imp
	read_pc_noinc();
	m_l = A;
	prefetch();

stam_imp
	read_pc_noinc();
	m_m = A;
	prefetch();

ldaj_imp
	read_pc_noinc();
	A = m_j;
	set_nz(A);
	prefetch();

ldak_imp
	read_pc_noinc();
	A = m_k;
	set_nz(A);
	prefetch();

ldal_imp
	read_pc_noinc();
	A = m_l;
	set_nz(A);
	prefetch();

ldam_imp
	read_pc_noinc();
	A = m_m;
	set_nz(A);
	prefetch();

cmpj_imp
	read_pc_noinc();
	do_cmp(A, m_j);
	prefetch();

cmpk_imp
	read_pc_noinc();
	do_cmp(A, m_k);
	prefetch();

cmpl_imp
	read_pc_noinc();
	do_cmp(A, m_l);
	prefetch();

cmpm_imp
	read_pc_noinc();
	do_cmp(A, m_m);
	prefetch();

sbcj_imp
	read_pc_noinc();
	do_sbc(m_j);
	prefetch();

sbck_imp
	read_pc_noinc();
	do_sbc(m_k);
	prefetch();

sbcl_imp
	read_pc_noinc();
	do_sbc(m_l);
	prefetch();

sbcm_imp
	read_pc_noinc();
	do_sbc(m_m);
	prefetch();

spa0_imp
	read_pc_noinc();
	m_pa = (m_pa & 0xffff00) | A;
	prefetch();

lpa0_imp
	read_pc_noinc();
	A = (m_pa & 0x0000ff) >> 0;
	set_nz(A);
	prefetch();

spa1_imp
	read_pc_noinc();
	m_pa = (m_pa & 0xff00ff) | (A << 8);
	prefetch();

lpa1_imp
	read_pc_noinc();
	A = (m_pa & 0x00ff00) >> 8;
	set_nz(A);
	prefetch();

spa2_imp
	read_pc_noinc();
	m_pa = (m_pa & 0x00ffff) | (A << 16);
	prefetch();

lpa2_imp
	read_pc_noinc();
	A = (m_pa & 0xff0000) >> 16;
	set_nz(A);
	prefetch();

spb0_imp
	read_pc_noinc();
	m_pb = (m_pb & 0xffff00) | A;
	prefetch();

lpb0_imp
	read_pc_noinc();
	A = (m_pb & 0x0000ff) >> 0;
	set_nz(A);
	prefetch();

spb1_imp
	read_pc_noinc();
	m_pb = (m_pb & 0xff00ff) | (A << 8);
	prefetch();

lpb1_imp
	read_pc_noinc();
	A = (m_pb & 0x00ff00) >> 8;
	set_nz(A);
	prefetch();

spb2_imp
	read_pc_noinc();
	m_pb = (m_pb & 0x00ffff) | (A << 16);
	prefetch();

lpb2_imp
	read_pc_noinc();
	A = (m_pb & 0xff0000) >> 16;
	set_nz(A);
	prefetch();

incpa_imp
	read_pc_noinc();
	m_pa = (m_pa & ~0xff) | ((m_pa+1) & 0xff);
	set_nz(m_pa&0xff); // startup code seems to require flag to set if low byte is 0x00?
	prefetch();

incpb_imp
	read_pc_noinc();
	m_pb = (m_pb & ~0xff) | ((m_pb+1) & 0xff);
	set_nz(m_pb&0xff); // startup code seems to require flag to set if low byte is 0x00?
	prefetch();

decpa_imp
	read_pc_noinc();
	m_pa = (m_pa & ~0xff) | ((m_pa-1) & 0xff);
	set_nz(m_pa&0xff); // startup code seems to require flag to set if low byte is 0x00?
	prefetch();

decpb_imp
	read_pc_noinc();
	m_pb = (m_pb & ~0xff) | ((m_pb-1) & 0xff);
	set_nz(m_pb&0xff); // startup code seems to require flag to set if low byte is 0x00?
	prefetch();

orapa_imp
	fatalerror("unhandled opcode %02x%04x: %02x\n", m_codebank, PPC, inst_state);
	read_pc_noinc();
	prefetch();

andpa_imp
	fatalerror("unhandled opcode %02x%04x: %02x\n", m_codebank, PPC, inst_state);
	read_pc_noinc();
	prefetch();

eorpa_imp
	fatalerror("unhandled opcode %02x%04x: %02x\n", m_codebank, PPC, inst_state);
	read_pc_noinc();
	prefetch();

adcpa_imp
	do_adc(read_full_data(m_pa));
	prefetch();

stapa_imp
	write_full_data(m_pa, A);
	prefetch();

ldapa_imp
	A = read_full_data(m_pa);
	set_nz(A);
	prefetch();

cmppa_imp
	TMP = read_full_data(m_pa);
	do_cmp(A, TMP);
	prefetch();

sbcpa_imp
	do_sbc(read_full_data(m_pa));
	prefetch();

orapb_imp
	fatalerror("unhandled opcode %02x%04x: %02x\n", m_codebank, PPC, inst_state);
	read_pc_noinc();
	prefetch();

andpb_imp
	fatalerror("unhandled opcode %02x%04x: %02x\n", m_codebank, PPC, inst_state);
	read_pc_noinc();
	prefetch();

eorpb_imp
	fatalerror("unhandled opcode %02x%04x: %02x\n", m_codebank, PPC, inst_state);
	read_pc_noinc();
	prefetch();

adcpb_imp
	do_adc(read_full_data(m_pb));
	prefetch();

stapb_imp
	write_full_data(m_pb, A);
	prefetch();

ldapb_imp
	A = read_full_data(m_pb);
	set_nz(A);
	prefetch();

cmppb_imp
	fatalerror("unhandled opcode %02x%04x: %02x\n", m_codebank, PPC, inst_state);
	read_pc_noinc();
	prefetch();

sbcpb_imp
	do_sbc(read_full_data(m_pb));
	prefetch();

stx_aby
	TMP = read_pc();
	TMP = set_h(TMP, read_pc());
	write(TMP+Y, X);
	prefetch();

sty_abx
	TMP = read_pc();
	TMP = set_h(TMP, read_pc());
	write(TMP+X, Y);
	prefetch();

stz_xav_zpg
	TMP = read_pc();
	write_zeropage(TMP, 0x00);
	prefetch();

stz_aba
	TMP = read_pc();
	TMP = set_h(TMP, read_pc());
	write(TMP, 0x00);
	prefetch();

bit_xav_zpx
	fatalerror("unhandled opcode %02x%04x: %02x\n", m_codebank, PPC, inst_state);
	read_pc_noinc();
	prefetch();

bit_abx
	fatalerror("unhandled opcode %02x%04x: %02x\n", m_codebank, PPC, inst_state);
	read_pc_noinc();
	prefetch();

bit_imm
	TMP = read_pc();
	if(A & TMP)
		P &= ~F_Z;
	else
		P |= F_Z;
	prefetch();

asr_xav_zpg
	TMP = read_pc(); // TODO: verify this, should it write back or set A?
	TMP2 = read_zeropage(TMP);
	do_asr(TMP2);
	prefetch();

asr_aba
	TMP = read_pc();
	TMP = set_h(TMP, read_pc());
	TMP2 = read(TMP);
	write(TMP, TMP2);
	TMP2 = do_asr(TMP2); // used by xavbox, see 14e8
	write(TMP, TMP2);
	prefetch();

asr_xav_zpx
	fatalerror("unhandled opcode %02x%04x: %02x\n", m_codebank, PPC, inst_state);
	read_pc_noinc();
	prefetch();

asr_acc
	A = do_asr(A);
	prefetch();

asr_abx
	fatalerror("unhandled opcode %02x%04x: %02x\n", m_codebank, PPC, inst_state);
	read_pc_noinc();
	prefetch();

cmc_imp
	fatalerror("unhandled opcode %02x%04x: %02x\n", m_codebank, PPC, inst_state);
	read_pc_noinc();
	prefetch();

sev_imp
	read_pc_noinc();
	P |= F_V;
	prefetch();

jmpf_ind
	TMP = read_pc();
	TMP = set_h(TMP, read_pc());
	PC = read(TMP);
	PC = set_h(PC, read(set_l(TMP, TMP+1)));
	TMP2 = read(TMP+2);
	set_codebank(TMP2);
	prefetch();