diff --git a/devices/memctrl/psx.cpp b/devices/memctrl/psx.cpp
new file mode 100644
index 0000000..1b8d40d
--- /dev/null
+++ b/devices/memctrl/psx.cpp
@@ -0,0 +1,128 @@
+/*
+DingusPPC - The Experimental PowerPC Macintosh emulator
+Copyright (C) 2018-22 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 .
+*/
+
+/** PSX Memory Controller emulation. */
+
+#include
+#include
+#include
+
+#include
+#include
+
+PsxCtrl::PsxCtrl(int bridge_num, std::string name)
+{
+ supports_types(HWCompType::MEM_CTRL | HWCompType::MMIO_DEV);
+
+ // add MMIO region for the PSX control registers
+ add_mmio_region(0xF8000000, 0x70, this);
+
+ this->sys_id = 0x30040000; // TODO: use correct value here!
+ this->chip_rev = 0; // old PSX, what's about PSX+?
+ this->sys_config = PSX_BUS_SPEED_50;
+}
+
+uint32_t PsxCtrl::read(uint32_t rgn_start, uint32_t offset, int size)
+{
+ switch (offset >> 3) {
+ case PsxReg::Sys_Id:
+ return this->sys_id;
+ case PsxReg::Revision:
+ return this->chip_rev;
+ case PsxReg::Sys_Config:
+ return this->sys_config;
+ default:
+ LOG_F(WARNING, "PSX: read from unsupported control register at 0x%X", offset);
+ return 0;
+ }
+}
+
+void PsxCtrl::write(uint32_t rgn_start, uint32_t offset, uint32_t value, int size)
+{
+ switch (offset >> 3) {
+ case PsxReg::Sys_Config:
+ this->sys_config = value;
+ break;
+ case PsxReg::ROM_Config:
+ this->rom_cfg = value;
+ break;
+ case PsxReg::DRAM_Config:
+ this->dram_cfg = value;
+ break;
+ case PsxReg::DRAM_Refresh:
+ this->dram_refresh = value;
+ break;
+ case PsxReg::Flash_Config:
+ this->flash_cfg = value;
+ break;
+ case PsxReg::Page1_Mapping:
+ case PsxReg::Page2_Mapping:
+ case PsxReg::Page3_Mapping:
+ case PsxReg::Page4_Mapping:
+ case PsxReg::Page5_Mapping:
+ this->pages_cfg[(offset >> 3) - PsxReg::Page1_Mapping] = value;
+ break;
+ default:
+ LOG_F(WARNING, "PSX: write to unsupported/read-only control register at 0x%X", offset);
+ };
+}
+
+void PsxCtrl::insert_ram_dimm(int slot_num, uint32_t capacity)
+{
+ if (slot_num < 0 || slot_num >= 5) {
+ ABORT_F("PSX: invalid DIMM slot %d", slot_num);
+ }
+
+ switch (capacity) {
+ case DRAM_CAP_2MB:
+ case DRAM_CAP_4MB:
+ case DRAM_CAP_8MB:
+ case DRAM_CAP_16MB:
+ case DRAM_CAP_32MB:
+ this->bank_sizes[slot_num] = capacity;
+ break;
+ default:
+ ABORT_F("PSX: unsupported DRAM capacity %d", capacity);
+ }
+}
+
+void PsxCtrl::map_phys_ram()
+{
+ uint32_t total_ram = 0;
+
+ for (int i = 0; i < 5; i++) {
+ total_ram += this->bank_sizes[i];
+ }
+
+ if (total_ram > DRAM_CAP_32MB) {
+ ABORT_F("PSX: RAM bigger than 32MB not supported yet");
+ }
+
+ if (!add_ram_region(0x00000000, total_ram)) {
+ ABORT_F("PSX: could not allocate RAM storage");
+ }
+}
+
+static const DeviceDescription Psx_Descriptor = {
+ PsxCtrl::create, {}, {}
+};
+
+REGISTER_DEVICE(Psx, Psx_Descriptor);
diff --git a/devices/memctrl/psx.h b/devices/memctrl/psx.h
new file mode 100644
index 0000000..c67d02e
--- /dev/null
+++ b/devices/memctrl/psx.h
@@ -0,0 +1,88 @@
+/*
+DingusPPC - The Experimental PowerPC Macintosh emulator
+Copyright (C) 2018-22 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 .
+*/
+
+/** PSX Memory Controller definitions. */
+
+#ifndef PSX_MEMCTRL_H
+#define PSX_MEMCTRL_H
+
+#include
+#include
+
+#include
+#include
+#include
+
+namespace PsxReg {
+ enum {
+ Sys_Id = 0,
+ Revision = 1,
+ Sys_Config = 2,
+ ROM_Config = 3,
+ DRAM_Config = 4,
+ DRAM_Refresh = 5,
+ Flash_Config = 6,
+ Page1_Mapping = 8,
+ Page2_Mapping = 9,
+ Page3_Mapping = 10,
+ Page4_Mapping = 11,
+ Page5_Mapping = 12,
+ Bus_Timeout = 13
+ };
+}; // namespace PsxReg
+
+/** Bus (aka CPU) speed constants. */
+enum {
+ PSX_BUS_SPEED_38 = 0, // bus frequency 38 MHz
+ PSX_BUS_SPEED_33 = 1, // bus frequency 33 MHz
+ PSX_BUS_SPEED_40 = 2, // bus frequency 40 MHz
+ PSX_BUS_SPEED_50 = 3, // bus frequency 50 MHz
+};
+
+class PsxCtrl : public MemCtrlBase, public MMIODevice {
+public:
+ PsxCtrl(int bridge_num, std::string name);
+ ~PsxCtrl() = default;
+
+ static std::unique_ptr create() {
+ return std::unique_ptr(new PsxCtrl(1, "PSX-PCI1"));
+ };
+
+ // MMIODevice methods
+ uint32_t read(uint32_t rgn_start, uint32_t offset, int size);
+ void write(uint32_t rgn_start, uint32_t offset, uint32_t value, int size);
+
+ void insert_ram_dimm(int slot_num, uint32_t capacity);
+ void map_phys_ram();
+
+private:
+ uint32_t sys_id;
+ uint32_t chip_rev;
+ uint32_t sys_config;
+ uint32_t rom_cfg;
+ uint32_t dram_cfg;
+ uint32_t dram_refresh;
+ uint32_t flash_cfg;
+ uint32_t pages_cfg[5];
+ uint32_t bank_sizes[5] = {};
+};
+
+#endif // PSX_MEMCTRL_H