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Attempts an implementation of auxiliary memory.

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This commit is contained in:
Thomas Harte 2018-07-29 10:41:12 -04:00
parent c905de2e40
commit 632b37ecec
2 changed files with 51 additions and 7 deletions
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56
Machines/AppleII/AppleII.cpp
View File

@ -209,6 +209,31 @@ template <bool is_iie> class ConcreteMachine:
// MARK - The IIe's auxiliary RAM controls.
bool alternative_zero_page_ = false;
bool read_auxiliary_memory_ = false;
bool write_auxiliary_memory_ = false;
void set_main_paging() {
for(int target = 0x02; target < 0xc0; ++target) {
write_pages_[target] = write_auxiliary_memory_ ? &aux_ram_[target << 8] : &ram_[target << 8];
read_pages_[target] = read_auxiliary_memory_ ? &aux_ram_[target << 8] : &ram_[target << 8];
}
if(video_->get_80_store()) {
int start_page, end_page;
if(video_->get_text()) {
start_page = 0x4;
end_page = 0x8;
} else {
start_page = 0x10;
end_page = 0x20;
}
bool use_aux_ram = video_->get_page2();
for(int target = start_page; target < end_page; ++target) {
write_pages_[target] = use_aux_ram ? &aux_ram_[target << 8] : &ram_[target << 8];
read_pages_[target] = use_aux_ram ? &aux_ram_[target << 8] : &ram_[target << 8];
}
}
}
// MARK - typing
std::unique_ptr<Utility::StringSerialiser> string_serialiser_;
@ -310,7 +335,7 @@ template <bool is_iie> class ConcreteMachine:
break;
case Target::Model::IIe:
rom_size += 3840;
rom_names.push_back("apple2e.rom");
rom_names.push_back("apple2eu.rom");
break;
}
const auto roms = rom_fetcher("AppleII", rom_names);
@ -501,7 +526,7 @@ template <bool is_iie> class ConcreteMachine:
// Read-only switches.
switch(address) {
default:
// printf("Unknown read from %04x\n", address);
printf("Unknown (?) read from %04x\n", address);
break;
case 0xc000:
@ -540,6 +565,10 @@ template <bool is_iie> class ConcreteMachine:
} break;
// The IIe-only state reads follow...
case 0xc011: if(is_iie) *value = (*value & 0x7f) | language_card_.bank1 ? 0x80 : 0x00; break;
case 0xc012: if(is_iie) *value = (*value & 0x7f) | language_card_.read ? 0x80 : 0x00; break;
case 0xc013: if(is_iie) *value = (*value & 0x7f) | read_auxiliary_memory_ ? 0x80 : 0x00; break;
case 0xc014: if(is_iie) *value = (*value & 0x7f) | write_auxiliary_memory_ ? 0x80 : 0x00; break;
case 0xc015: if(is_iie) *value = (*value & 0x7f) | internal_CX_rom_ ? 0x80 : 0x00; break;
case 0xc016: if(is_iie) *value = (*value & 0x7f) | alternative_zero_page_ ? 0x80 : 0x00; break;
case 0xc017: if(is_iie) *value = (*value & 0x7f) | slot_C3_rom_ ? 0x80 : 0x00; break;
@ -555,10 +584,21 @@ template <bool is_iie> class ConcreteMachine:
} else {
// Write-only switches. All IIe as currently implemented.
if(is_iie) {
// printf("w %04x\n", address);
if(address >= 0xc000 && address < 0xc100) printf("w %04x\n", address);
switch(address) {
default:
// printf("Unknown write to %04x\n", address);
printf("Unknown (?) write to %04x\n", address);
break;
case 0xc002:
case 0xc003:
read_auxiliary_memory_ = !!(address&1);
set_main_paging();
break;
case 0xc004:
case 0xc005:
write_auxiliary_memory_ = !!(address&1);
set_main_paging();
break;
case 0xc006:
@ -621,8 +661,12 @@ template <bool is_iie> class ConcreteMachine:
case 0xc051: update_video(); video_->set_text(true); break;
case 0xc052: update_video(); video_->set_mixed(false); break;
case 0xc053: update_video(); video_->set_mixed(true); break;
case 0xc054: update_video(); video_->set_page2(false); break;
case 0xc055: update_video(); video_->set_page2(true); break;
case 0xc054:
case 0xc055:
update_video();
video_->set_page2(!!(address&1));
set_main_paging();
break;
case 0xc056: update_video(); video_->set_high_resolution(false); break;
case 0xc057: update_video(); video_->set_high_resolution(true); break;

2
Machines/AppleII/Video.cpp
View File

@ -59,7 +59,7 @@ bool VideoBase::get_80_store() {
}
void VideoBase::set_page2(bool page2) {
page2_ = page2;;
page2_ = page2;
}
bool VideoBase::get_page2() {