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Adds just enough of the MSX memory map for the Z80 to appear to try to do useful things.

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This commit is contained in:
Thomas Harte 2017-11-26 18:34:40 -05:00
parent 0eb5dd9688
commit 7a8a43a96a
1 changed files with 14 additions and 1 deletions
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15
Machines/MSX/MSX.cpp
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@ -98,6 +98,7 @@ class ConcreteMachine:
case CPU::Z80::PartialMachineCycle::Output: case CPU::Z80::PartialMachineCycle::Output:
switch(address & 0xff) { switch(address & 0xff) {
case 0x98: case 0x99: case 0x98: case 0x99:
printf("VDP %d %02x\n", address&1, *cycle.value);
vdp_->set_register(address, *cycle.value); vdp_->set_register(address, *cycle.value);
break; break;
@ -113,6 +114,7 @@ class ConcreteMachine:
case 0xa8: case 0xa9: case 0xa8: case 0xa9:
case 0xaa: case 0xab: case 0xaa: case 0xab:
printf("8255 %d %02x\n", address&3, *cycle.value);
i8255_.set_register(address, *cycle.value); i8255_.set_register(address, *cycle.value);
break; break;
} }
@ -131,7 +133,8 @@ class ConcreteMachine:
auto roms = roms_with_names( auto roms = roms_with_names(
"MSX", "MSX",
{ {
"basic.rom", "main_msx1.rom" "basic.rom",
"main_msx1.rom"
}); });
if(!roms[0] || !roms[1]) return false; if(!roms[0] || !roms[1]) return false;
@ -142,6 +145,15 @@ class ConcreteMachine:
main_ = std::move(*roms[1]); main_ = std::move(*roms[1]);
main_.resize(16384); main_.resize(16384);
for(size_t c = 0; c < 4; ++c) {
write_pointers_[c] = &ram_[c * 16384];
read_pointers_[c] = &ram_[c * 16384];
}
read_pointers_[0] = main_.data();
write_pointers_[0] = scratch_;
read_pointers_[1] = basic_.data();
write_pointers_[1] = scratch_;
return true; return true;
} }
@ -157,6 +169,7 @@ class ConcreteMachine:
uint8_t *read_pointers_[4]; uint8_t *read_pointers_[4];
uint8_t *write_pointers_[4]; uint8_t *write_pointers_[4];
uint8_t ram_[65536]; uint8_t ram_[65536];
uint8_t scratch_[16384];
std::vector<uint8_t> basic_, main_; std::vector<uint8_t> basic_, main_;
}; };