Barebones workings for serial

devices/heathrow.cpp

@@ -121,6 +121,15 @@ uint32_t HeathrowIC::read(uint32_t reg_start, uint32_t offset, int size) {
     case 8:
         res = dma_read(offset - 0x8000, size);
         break;
+    case 0x13:
+        if ((offset - 0x13000) >= 0x20) {
+            LOG_F(INFO, "Serial: Reading from Channel A \n");
+        }
+        else {
+            LOG_F(INFO, "Serial: Reading from Channel B \n");
+        }
+        res = this->serial->read(offset - 0x13000);
+        break;
     case 0x14:
         res = this->screamer->snd_ctrl_read(offset - 0x14000, size);
         break;
@@ -151,6 +160,14 @@ void HeathrowIC::write(uint32_t reg_start, uint32_t offset, uint32_t value, int
     case 8:
         dma_write(offset - 0x8000, value, size);
         break;
+    case 0x13:
+        if ((offset - 0x13000) >= 0x20) {
+            LOG_F(INFO, "Serial: Writing to Channel A \n");
+        } else {
+            LOG_F(INFO, "Serial: Writing to Channel B \n");
+        }
+        this->serial->write(offset - 0x13000, value);
+        break;
     case 0x14:
         this->screamer->snd_ctrl_write(offset - 0x14000, value, size);
         break;

devices/macio.h

@@ -60,6 +60,7 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 #include "pcidevice.h"
 #include "pcihost.h"
 #include "viacuda.h"
+#include "z85c30.h"
 #include <cinttypes>
 
 /**
@@ -147,6 +148,7 @@ private:
     ViaCuda* viacuda;     /* VIA cell with Cuda MCU attached to it */
     NVram* nvram;         /* NVRAM cell */
     AWACDevice* screamer; /* Screamer audio codec instance */
+    Z85C30* serial;       /* Serial cell */
 
     DMAChannel* snd_out_dma;
 };

devices/z85c30.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 <https://www.gnu.org/licenses/>.
+*/
+
+#include "devices/z85c30.h"
+#include <cinttypes>
+#include <thirdparty/loguru/loguru.hpp>
+
+
+Z85C30::Z85C30() {
+    write_registers[0x04] = 0x04;
+    write_registers[0x09] = 0xC0;
+    write_registers[0x0B] = 0x08;
+    write_registers[0x0E] = 0x30;
+    write_registers[0x0F] = 0xF8;
+
+    read_registers[0x00]  = 0x44;
+    read_registers[0x01]  = 0x06;
+}
+
+Z85C30::~Z85C30() {
+
+}
+
+uint8_t Z85C30::read(uint8_t reg) {
+    LOG_F(INFO, "Reading from register %d: 0x%x \n", reg, this->write_registers[reg]);
+    return this->write_registers[reg];
+}
+
+void Z85C30::write(uint8_t reg, uint8_t value) {
+    LOG_F(INFO, "Writing value 0x%x to register %d \n", value, reg);
+
+    if (reg == 0x07) {
+        if (this->enable_wr7_alt) {
+            this->wr7_alt = value;
+        }
+        else {
+            this->write_registers[0x07] = value;
+        }
+    } 
+    else {
+        this->write_registers[reg] = value;
+    }
+
+    if (reg == 0x0F) {
+        if (this->write_registers[0x0F] & 0x1) {
+            this->enable_wr7_alt = true;
+        }
+        else{
+            this->enable_wr7_alt = false;
+        }
+    }
+}

devices/z85c30.h

@@ -0,0 +1,49 @@
+/*
+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 <https://www.gnu.org/licenses/>.
+*/
+
+/** @file Descriptor-based direct memory access emulation.
+
+    Official documentation can be found in the fifth chapter of the book
+    "Macintosh Technology in the Common Hardware Reference Platform"
+    by Apple Computer, Inc.
+ */
+
+#ifndef Z85C30_H
+#define Z85C30_H
+
+#include <cinttypes>
+
+class Z85C30 {
+public:
+    Z85C30();
+    ~Z85C30();
+
+    uint8_t read(uint8_t reg);
+    void write(uint8_t reg, uint8_t value);
+
+    private:
+    uint8_t read_registers[16]  = {0x00};
+    uint8_t write_registers[16] = {0x00};
+    uint8_t wr7_alt             = 0x20;
+    bool enable_wr7_alt         = false;
+};
+
+#endif /* Z85C30_H */