Add Prophet64 support

README.md

@@ -40,6 +40,7 @@ The following cartridge types are currently supported:
 * Super Snapshot v5
 * Comal-80
 * EasyFlash
+* Prophet64
 * Freeze Frame
 * Freeze Machine
 * RGCD, Hucky

firmware/cartridges/cartridge.c

@@ -35,6 +35,7 @@
 #include "super_snapshot_5.c"
 #include "comal80.c"
 #include "easyflash.c"
+#include "prophet64.c"
 #include "freeze_machine.c"
 #include "rgcd.c"
 
@@ -96,6 +97,9 @@ static void (*crt_get_handler(uint32_t cartridge_type, bool vic_support)) (void)
                 return ef_sdio_handler;
             }
 
+        case CRT_PROPHET64:
+            return prophet64_handler;
+
         case CRT_FREEZE_FRAME:
         case CRT_FREEZE_MACHINE:
             return fm_handler;

firmware/cartridges/prophet64.c

@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2019-2021 Kim Jørgensen
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty.  In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ *    claim that you wrote the original software. If you use this software
+ *    in a product, an acknowledgment in the product documentation would be
+ *    appreciated but is not required.
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ *    misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source distribution.
+ */
+
+/*************************************************
+* C64 bus read callback
+*************************************************/
+static inline bool prophet64_read_handler(uint32_t control, uint32_t addr)
+{
+    if (!(control & C64_ROML))
+    {
+        c64_data_write(crt_ptr[addr & 0x1fff]);
+        return true;
+    }
+
+    return false;
+}
+
+/*************************************************
+* C64 bus write callback
+*************************************************/
+static inline void prophet64_write_handler(uint32_t control, uint32_t addr, uint32_t data)
+{
+    if (!(control & C64_IO2))
+    {
+        crt_ptr = crt_banks[data & 0x1f];
+
+        if (data & 0x20)
+        {
+            // Disable cartridge
+            c64_crt_control(STATUS_LED_OFF|CRT_PORT_NONE);
+        }
+        else
+        {
+            // Enable cartridge
+            c64_crt_control(STATUS_LED_ON|CRT_PORT_8K);
+        }
+    }
+}
+
+C64_BUS_HANDLER(prophet64)