Add support for Pagefox cartridge

README.md

@@ -43,6 +43,7 @@ The following cartridge types are currently supported:
 * Prophet64
 * Freeze Frame
 * Freeze Machine
+* Pagefox
 * RGCD, Hucky
 * Drean
 

firmware/cartridges/cartridge.c

@@ -48,6 +48,7 @@ static u32 freezer_state;
 #include "easyflash_3.c"
 #include "prophet64.c"
 #include "freeze_machine.c"
+#include "pagefox.c"
 #include "rgcd.c"
 #include "c128_normal.c"
 #include "kff.c"
@@ -120,6 +121,9 @@ static void (*crt_get_handler(u32 cartridge_type, bool vic_support)) (void)
         case CRT_FREEZE_MACHINE:
             return NTSC_OR_PAL_HANDLER(fm);
 
+        case CRT_PAGEFOX:
+            return pagefox_handler;
+
         case CRT_RGCD:
             return rgcd_handler;
 
@@ -181,6 +185,10 @@ static void crt_init(DAT_CRT_HEADER *crt_header)
             fm_init(crt_header);
             break;
 
+        case CRT_PAGEFOX:
+            pagefox_init();
+            break;
+
         case CRT_RGCD:
             rgcd_init(crt_header);
             break;

firmware/cartridges/pagefox.c

@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2022 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.
+ */
+
+static u8 * const pagefox_mode[8] =
+{
+    CRT_DAT_BANK(0),
+    CRT_DAT_BANK(1),
+    CRT_DAT_BANK(2),
+    CRT_DAT_BANK(3),
+    CRT_RAM_BANK(0),
+    CRT_RAM_BANK(2),
+    NULL,
+    NULL
+};
+
+/*************************************************
+* C64 bus read callback
+*************************************************/
+FORCE_INLINE bool pagefox_read_handler(u32 control, u32 addr)
+{
+    if ((control & (C64_ROML|C64_ROMH)) != (C64_ROML|C64_ROMH) && crt_ptr)
+    {
+        C64_DATA_WRITE(crt_ptr[addr & 0x3fff]);
+        return true;
+    }
+
+    return false;
+}
+
+/*************************************************
+* C64 bus write callback
+*************************************************/
+FORCE_INLINE void pagefox_write_handler(u32 control, u32 addr, u32 data)
+{
+    if (!(control & C64_IO1))
+    {
+        // Register at $de80-$deff
+        if (addr & 0x80)
+        {
+            u32 mode = (data >> 1) & 0x07;
+            crt_ptr = pagefox_mode[mode];
+
+            if (!(data & 0x10))
+            {
+                C64_CRT_CONTROL(STATUS_LED_ON|CRT_PORT_16K);
+            }
+            else
+            {
+                C64_CRT_CONTROL(STATUS_LED_OFF|CRT_PORT_NONE);
+            }
+        }
+
+        return;
+    }
+
+    // Ram at $8000-$bfff
+    if ((addr >> 14) == 0x02 &&
+        (((u32)crt_ptr >> 15) == ((u32)CRT_RAM_BANK(0) >> 15)))
+    {
+        crt_ptr[addr & 0x3fff] = (u8)data;
+        return;
+    }
+}
+
+static void pagefox_init(void)
+{
+    C64_CRT_CONTROL(STATUS_LED_ON|CRT_PORT_16K);
+}
+
+C64_BUS_HANDLER(pagefox)