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when to update MMR1

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folkert van heusden 2023-03-23 13:57:44 +01:00
parent 763f078bd3
commit cd4322ac4a
Signed by untrusted user who does not match committer: folkert
GPG key ID: 6B6455EDFEED3BD1
1 changed files with 5 additions and 3 deletions
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8
cpu.cpp
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@ -304,7 +304,7 @@ void cpu::queue_interrupt(const uint8_t level, const uint8_t vector)
void cpu::addToMMR1(const uint8_t mode, const uint8_t reg, const bool word_mode)
{
if (mode == 0 || mode == 1 || (b->getMMR0() & 0160000 /* bits frozen? */))
if (b->getMMR0() & 0160000 /* bits frozen? */)
return;
bool neg = mode == 4 || mode == 5;
@ -326,8 +326,6 @@ gam_rc_t cpu::getGAM(const uint8_t mode, const uint8_t reg, const bool word_mode
g.space = reg == 7 ? i_space : (b->get_use_data_space(psw >> 14) ? d_space : i_space);
// ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ always d_space here? TODO
addToMMR1(mode, reg, word_mode);
uint16_t next_word = 0;
switch(mode) {
@ -345,24 +343,28 @@ gam_rc_t cpu::getGAM(const uint8_t mode, const uint8_t reg, const bool word_mode
if (read_value)
g.value = b->read(g.addr.value(), word_mode, prev_mode, false, g.space);
addRegister(reg, prev_mode, !word_mode || reg == 7 || reg == 6 ? 2 : 1);
addToMMR1(mode, reg, word_mode);
break;
case 3:
g.addr = b->read(getRegister(reg, g.set, prev_mode), false, prev_mode, g.space);
addRegister(reg, prev_mode, 2);
if (read_value)
g.value = b->read(g.addr.value(), word_mode, prev_mode, false, d_space);
addToMMR1(mode, reg, word_mode);
break;
case 4:
addRegister(reg, prev_mode, !word_mode || reg == 7 || reg == 6 ? -2 : -1);
g.addr = getRegister(reg, g.set, prev_mode);
if (read_value)
g.value = b->read(g.addr.value(), word_mode, prev_mode, false, g.space);
addToMMR1(mode, reg, word_mode);
break;
case 5:
addRegister(reg, prev_mode, -2);
g.addr = b->read(getRegister(reg, g.set, prev_mode), false, prev_mode, g.space);
if (read_value)
g.value = b->read(g.addr.value(), word_mode, prev_mode, d_space);
addToMMR1(mode, reg, word_mode);
break;
case 6:
next_word = b->read(getPC(), false, prev_mode, i_space);