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https://github.com/ekeeke/Genesis-Plus-GX.git
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~modified default 68k mapped memory (VDP DMA accesses WRAM only above $800000)
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72ec155b38
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@ -163,7 +163,7 @@ void cart_hw_init()
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***********************************************/
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for (i=0; i<0x40; i++)
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{
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/* cartridge ROM */
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/* cartridge ROM */
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m68k_memory_map[i].base = cart_rom + (i<<16);
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m68k_memory_map[i].read8 = NULL;
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m68k_memory_map[i].read16 = NULL;
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@ -175,7 +175,8 @@ void cart_hw_init()
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for (i=0x40; i<0x80; i++)
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{
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/* unused area */
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/* unused area */
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m68k_memory_map[i].base = cart_rom + (i<<16);
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m68k_memory_map[i].read8 = m68k_read_bus_8;
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m68k_memory_map[i].read16 = m68k_read_bus_16;
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m68k_memory_map[i].write8 = m68k_unused_8_w;
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@ -53,8 +53,10 @@ void gen_init (void)
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m68k_init();
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z80_init(0,0,0,z80_irq_callback);
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/* initialize 68k default address space */
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for (i=0x0; i<0x100; i++)
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/* initialize 68k mapped memory */
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/* $000000-$7fffff is affected to cartridge area (see cart_hw.c) */
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/* $800000-$ffffff is affected to WRAM (see VDP DMA) */
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for (i=0x80; i<0x100; i++)
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{
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m68k_memory_map[i].base = work_ram;
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m68k_memory_map[i].read8 = NULL;
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@ -65,7 +67,7 @@ void gen_init (void)
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zbank_memory_map[i].write = NULL;
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}
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/* initialize 68k memory map */
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/* initialize 68k memory handlers */
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for (i=0x80; i<0xe0; i++)
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{
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/* illegal area */
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