blob: cc5539dcd9c2354749bb3f4973ce3d378725e090 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
/***************************************************************************
machine.c
Written by Kenneth Lin (kenneth_lin@ai.vancouver.bc.ca)
Functions to emulate general aspects of the machine (RAM, ROM, interrupts,
I/O ports)
***************************************************************************/
#include "driver.h"
#include "cpu/m6809/m6809.h"
extern UINT8 jackal_interrupt_enable;
extern void jackal_mark_tile_dirty(int offset);
UINT8 *jackal_rambank = 0;
UINT8 *jackal_spritebank = 0;
MACHINE_RESET( jackal )
{
memory_set_bankptr(1,&((memory_region(REGION_CPU1))[0x4000]));
jackal_rambank = &((memory_region(REGION_CPU1))[0]);
jackal_spritebank = &((memory_region(REGION_CPU1))[0]);
}
READ8_HANDLER( jackal_zram_r )
{
return jackal_rambank[0x0020+offset];
}
READ8_HANDLER( jackal_voram_r )
{
return jackal_rambank[0x2000+offset];
}
READ8_HANDLER( jackal_spriteram_r )
{
return jackal_spritebank[0x3000+offset];
}
WRITE8_HANDLER( jackal_rambank_w )
{
if (data & 0xc4) popmessage("jackal_rambank_w %02x",data);
coin_counter_w(0,data & 0x01);
coin_counter_w(1,data & 0x02);
jackal_rambank = &((memory_region(REGION_CPU1))[((data & 0x10) << 12)]);
jackal_spritebank = &((memory_region(REGION_CPU1))[((data & 0x08) << 13)]);
memory_set_bankptr(1,&((memory_region(REGION_CPU1))[((data & 0x20) << 11) + 0x4000]));
}
WRITE8_HANDLER( jackal_zram_w )
{
jackal_rambank[0x0020+offset] = data;
}
WRITE8_HANDLER( jackal_voram_w )
{
if ((offset & 0xF800) == 0)
{
jackal_mark_tile_dirty(offset & 0x3ff);
}
jackal_rambank[0x2000+offset] = data;
}
WRITE8_HANDLER( jackal_spriteram_w )
{
jackal_spritebank[0x3000+offset] = data;
}
|