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m740: NMI does not exist; update notes

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This commit is contained in:
AJR 2021-01-20 13:05:37 -05:00
parent 2638f59b93
commit e669b5ef46
1 changed files with 8 additions and 14 deletions
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22
src/devices/cpu/m6502/om740.lst
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@ -182,7 +182,7 @@ jsr_zpi
stp_imp
read_pc_noinc();
logerror("STP at $%04x\n", PC);
while(!nmi_pending && !irq_state) {
while(!irq_state) {
eat-all-cycles;
}
prefetch();
@ -190,7 +190,7 @@ stp_imp
wit_imp
read_pc_noinc();
logerror("WIT at $%04x\n", PC);
while(!nmi_pending && !irq_state) {
while(!irq_state) {
eat-all-cycles;
}
prefetch();
@ -209,7 +209,6 @@ reset_m
inst_state = -1;
brk_m_imp
// The 6502 bug when a nmi occurs in a brk is reproduced (case !irq_taken && nmi_pending)
if(irq_taken) {
read_pc_noinc();
} else {
@ -221,17 +220,11 @@ brk_m_imp
dec_SP();
write(SP, irq_taken ? P & ~F_B : P);
dec_SP();
if(nmi_pending) {
PC = read_arg(0xfffa);
PC = set_h(PC, read_arg(0xfffb));
nmi_pending = false;
standard_irq_callback(NMI_LINE);
} else {
PC = read_arg(m_irq_vector);
PC = set_h(PC, read_arg(m_irq_vector+1));
if(irq_taken)
standard_irq_callback(IRQ_LINE);
}
// BRK uses the vector of the interrupt with the highest priority if any are enabled and pending
PC = read_arg(m_irq_vector);
PC = set_h(PC, read_arg(m_irq_vector+1));
if(irq_taken)
standard_irq_callback(IRQ_LINE);
irq_taken = false;
P |= F_I; // Do *not* move after the prefetch
prefetch();
@ -689,6 +682,7 @@ inc_m_zpx
prefetch();
jmp_m_ind
// JMP ($XXFF) has the same bug as on the NMOS 6502
TMP = read_pc();
TMP = set_h(TMP, read_pc());
PC = read_data(TMP);