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~modified default 68k mapped memory (VDP DMA accesses WRAM only above $800000)

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ekeeke31 2009-06-16 17:00:40 +00:00
parent 72ec155b38
commit 405489769e
2 changed files with 8 additions and 5 deletions
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1
source/cart_hw/cart_hw.c
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@ -176,6 +176,7 @@ void cart_hw_init()
for (i=0x40; i<0x80; i++) for (i=0x40; i<0x80; i++)
{ {
/* unused area */ /* unused area */
m68k_memory_map[i].base = cart_rom + (i<<16);
m68k_memory_map[i].read8 = m68k_read_bus_8; m68k_memory_map[i].read8 = m68k_read_bus_8;
m68k_memory_map[i].read16 = m68k_read_bus_16; m68k_memory_map[i].read16 = m68k_read_bus_16;
m68k_memory_map[i].write8 = m68k_unused_8_w; m68k_memory_map[i].write8 = m68k_unused_8_w;

8
source/genesis.c
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@ -53,8 +53,10 @@ void gen_init (void)
m68k_init(); m68k_init();
z80_init(0,0,0,z80_irq_callback); z80_init(0,0,0,z80_irq_callback);
/* initialize 68k default address space */ /* initialize 68k mapped memory */
for (i=0x0; i<0x100; i++) /* $000000-$7fffff is affected to cartridge area (see cart_hw.c) */
/* $800000-$ffffff is affected to WRAM (see VDP DMA) */
for (i=0x80; i<0x100; i++)
{ {
m68k_memory_map[i].base = work_ram; m68k_memory_map[i].base = work_ram;
m68k_memory_map[i].read8 = NULL; m68k_memory_map[i].read8 = NULL;
@ -65,7 +67,7 @@ void gen_init (void)
zbank_memory_map[i].write = NULL; zbank_memory_map[i].write = NULL;
} }
/* initialize 68k memory map */ /* initialize 68k memory handlers */
for (i=0x80; i<0xe0; i++) for (i=0x80; i<0xe0; i++)
{ {
/* illegal area */ /* illegal area */