diff --git a/devices/hmc.cpp b/devices/hmc.cpp
new file mode 100644
index 0000000..52d54d7
--- /dev/null
+++ b/devices/hmc.cpp
@@ -0,0 +1,70 @@
+/*
+DingusPPC - The Experimental PowerPC Macintosh emulator
+Copyright (C) 2018-20 divingkatae and maximum
+ (theweirdo) spatium
+
+(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see .
+*/
+
+/** Highspeed Memory Controller emulation.
+
+ Author: Max Poliakovski
+*/
+
+#include "hmc.h"
+
+HMC::HMC() : MemCtrlBase()
+{
+ this->name = "Highspeed Memory Controller";
+
+ /* add memory mapped I/O region for the HMC control register */
+ add_mmio_region(0x50F40000, 0xFFFF, this);
+
+ this->config_reg = 0ULL;
+ this->bit_pos = 0;
+}
+
+bool HMC::supports_type(HWCompType type) {
+ if (type == HWCompType::MEM_CTRL || type == HWCompType::MMIO_DEV) {
+ return true;
+ } else {
+ return false;
+ }
+}
+
+uint32_t HMC::read(uint32_t reg_start, uint32_t offset, int size)
+{
+ if (!offset)
+ return !!(this->config_reg & (1ULL << this->bit_pos++));
+ else
+ return 0; /* FIXME: what should be returned for invalid offsets? */
+}
+
+void HMC::write(uint32_t reg_start, uint32_t offset, uint32_t value, int size)
+{
+ uint64_t bit;
+
+ switch(offset) {
+ case 0:
+ bit = 1ULL << this->bit_pos++;
+ this->config_reg = (value & 1) ? this->config_reg | bit :
+ this->config_reg & ~bit;
+ break;
+ case 8: /* writing to HMCBase + 8 resets internal bit position */
+ this->bit_pos = 0;
+ break;
+ }
+}
diff --git a/devices/hmc.h b/devices/hmc.h
new file mode 100644
index 0000000..f996e04
--- /dev/null
+++ b/devices/hmc.h
@@ -0,0 +1,54 @@
+/*
+DingusPPC - The Experimental PowerPC Macintosh emulator
+Copyright (C) 2018-20 divingkatae and maximum
+ (theweirdo) spatium
+
+(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see .
+*/
+
+/** Highspeed Memory Controller emulation.
+
+ Author: Max Poliakovski
+
+ Highspeed Memory Controller (HMC) is a custom memory
+ and L2 cache controller designed especially for the
+ first generation of the PowerMacintosh computer.
+*/
+
+#ifndef HMC_H
+#define HMC_H
+
+#include "hwcomponent.h"
+#include "memctrlbase.h"
+#include "mmiodevice.h"
+
+class HMC : public MemCtrlBase, public MMIODevice {
+public:
+ HMC();
+ ~HMC() = default;
+
+ bool supports_type(HWCompType type);
+
+ /* MMIODevice methods */
+ uint32_t read(uint32_t reg_start, uint32_t offset, int size);
+ void write(uint32_t reg_start, uint32_t offset, uint32_t value, int size);
+
+private:
+ int bit_pos;
+ uint64_t config_reg;
+};
+
+#endif // HMC_H
diff --git a/machines/machinefactory.cpp b/machines/machinefactory.cpp
index 743fed8..8d3f501 100644
--- a/machines/machinefactory.cpp
+++ b/machines/machinefactory.cpp
@@ -36,6 +36,7 @@ along with this program. If not, see .
#include
#include