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Implements RAM paging. The 6128 is now emulated.

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This commit is contained in:
Thomas Harte 2017-08-08 16:01:56 -04:00
parent dbf9927caf
commit 484524d781
2 changed files with 39 additions and 8 deletions
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45
Machines/AmstradCPC/AmstradCPC.cpp
View File

@ -584,10 +584,10 @@ class ConcreteMachine:
case 1: crtc_bus_handler_.set_colour(*cycle.value & 0x1f); break;
case 2:
// Perform ROM paging.
read_pointers_[0] = (*cycle.value & 4) ? &ram_[0] : roms_[rom_model_].data();
read_pointers_[0] = (*cycle.value & 4) ? write_pointers_[0] : roms_[rom_model_].data();
upper_rom_is_paged_ = !(*cycle.value & 8);
read_pointers_[3] = upper_rom_is_paged_ ? roms_[upper_rom_].data() : &ram_[49152];
read_pointers_[3] = upper_rom_is_paged_ ? roms_[upper_rom_].data() : write_pointers_[3];
// Reset the interrupt timer if requested.
if(*cycle.value & 0x10) interrupt_timer_.reset_count();
@ -595,7 +595,31 @@ class ConcreteMachine:
// Post the next mode.
crtc_bus_handler_.set_next_mode(*cycle.value & 3);
break;
case 3: printf("RAM paging?\n"); break;
case 3:
// Perform RAM paging, if 128kb is permitted.
if(has_128k_) {
bool adjust_low_read_pointer = read_pointers_[0] == write_pointers_[0];
bool adjust_high_read_pointer = read_pointers_[3] == write_pointers_[3];
#define RAM_BANK(x) &ram_[x * 16384]
#define RAM_CONFIG(a, b, c, d) write_pointers_[0] = RAM_BANK(a); write_pointers_[1] = RAM_BANK(b); write_pointers_[2] = RAM_BANK(c); write_pointers_[3] = RAM_BANK(d);
switch(*cycle.value & 7) {
case 0: RAM_CONFIG(0, 1, 2, 3); break;
case 1: RAM_CONFIG(0, 1, 2, 7); break;
case 2: RAM_CONFIG(4, 5, 6, 7); break;
case 3: RAM_CONFIG(0, 3, 2, 7); break;
case 4: RAM_CONFIG(0, 4, 2, 3); break;
case 5: RAM_CONFIG(0, 5, 2, 3); break;
case 6: RAM_CONFIG(0, 6, 2, 3); break;
case 7: RAM_CONFIG(0, 7, 2, 3); break;
}
#undef RAM_CONFIG
#undef RAM_BANK
if(adjust_low_read_pointer) read_pointers_[0] = write_pointers_[0];
read_pointers_[1] = write_pointers_[1];
read_pointers_[2] = write_pointers_[2];
if(adjust_high_read_pointer) read_pointers_[3] = write_pointers_[3];
}
break;
}
}
@ -709,14 +733,17 @@ class ConcreteMachine:
switch(target.amstradcpc.model) {
case StaticAnalyser::AmstradCPCModel::CPC464:
rom_model_ = ROMType::OS464;
has_128k_ = false;
has_fdc_ = false;
break;
case StaticAnalyser::AmstradCPCModel::CPC664:
rom_model_ = ROMType::OS664;
has_128k_ = false;
has_fdc_ = true;
break;
case StaticAnalyser::AmstradCPCModel::CPC6128:
rom_model_ = ROMType::OS6128;
has_128k_ = true;
has_fdc_ = true;
break;
}
@ -724,16 +751,17 @@ class ConcreteMachine:
// Establish default memory map
upper_rom_is_paged_ = true;
upper_rom_ = rom_model_ + 1;
read_pointers_[0] = roms_[rom_model_].data();
read_pointers_[1] = &ram_[16384];
read_pointers_[2] = &ram_[32768];
read_pointers_[3] = roms_[upper_rom_].data();
write_pointers_[0] = &ram_[0];
write_pointers_[1] = &ram_[16384];
write_pointers_[2] = &ram_[32768];
write_pointers_[3] = &ram_[49152];
read_pointers_[0] = roms_[rom_model_].data();
read_pointers_[1] = write_pointers_[1];
read_pointers_[2] = write_pointers_[2];
read_pointers_[3] = roms_[upper_rom_].data();
// If there are any tapes supplied, use the first of them.
if(!target.tapes.empty()) {
tape_player_.set_tape(target.tapes.front());
@ -785,12 +813,15 @@ class ConcreteMachine:
HalfCycles half_cycles_since_ay_update_;
uint8_t ram_[128 * 1024];
std::vector<uint8_t> roms_[7];
int rom_model_;
bool has_fdc_;
bool has_128k_;
bool upper_rom_is_paged_;
int upper_rom_;
uint8_t *ram_pages_[4];
uint8_t *read_pointers_[4];
uint8_t *write_pointers_[4];

2
StaticAnalyser/AmstradCPC/StaticAnalyser.cpp
View File

@ -20,7 +20,7 @@ void StaticAnalyser::AmstradCPC::AddTargets(
target.tapes = tapes;
target.cartridges = cartridges;
target.amstradcpc.model = target.disks.empty() ? AmstradCPCModel::CPC464 : AmstradCPCModel::CPC664;
target.amstradcpc.model = target.disks.empty() ? AmstradCPCModel::CPC464 : AmstradCPCModel::CPC6128;
destination.push_back(target);
}