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
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
/* Emulation of the Z80 CPU with hooks into the other parts of aylet.
* Copyright (C) 1994 Ian Collier. aylet changes (C) 2001-2002 Russell Marks.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdio.h>
#include <signal.h>
#include <unistd.h>
#include "main.h"
#include "z80.h"
#define parity(a) (partable[a])
unsigned char partable[256]={
4, 0, 0, 4, 0, 4, 4, 0, 0, 4, 4, 0, 4, 0, 0, 4,
0, 4, 4, 0, 4, 0, 0, 4, 4, 0, 0, 4, 0, 4, 4, 0,
0, 4, 4, 0, 4, 0, 0, 4, 4, 0, 0, 4, 0, 4, 4, 0,
4, 0, 0, 4, 0, 4, 4, 0, 0, 4, 4, 0, 4, 0, 0, 4,
0, 4, 4, 0, 4, 0, 0, 4, 4, 0, 0, 4, 0, 4, 4, 0,
4, 0, 0, 4, 0, 4, 4, 0, 0, 4, 4, 0, 4, 0, 0, 4,
4, 0, 0, 4, 0, 4, 4, 0, 0, 4, 4, 0, 4, 0, 0, 4,
0, 4, 4, 0, 4, 0, 0, 4, 4, 0, 0, 4, 0, 4, 4, 0,
0, 4, 4, 0, 4, 0, 0, 4, 4, 0, 0, 4, 0, 4, 4, 0,
4, 0, 0, 4, 0, 4, 4, 0, 0, 4, 4, 0, 4, 0, 0, 4,
4, 0, 0, 4, 0, 4, 4, 0, 0, 4, 4, 0, 4, 0, 0, 4,
0, 4, 4, 0, 4, 0, 0, 4, 4, 0, 0, 4, 0, 4, 4, 0,
4, 0, 0, 4, 0, 4, 4, 0, 0, 4, 4, 0, 4, 0, 0, 4,
0, 4, 4, 0, 4, 0, 0, 4, 4, 0, 0, 4, 0, 4, 4, 0,
0, 4, 4, 0, 4, 0, 0, 4, 4, 0, 0, 4, 0, 4, 4, 0,
4, 0, 0, 4, 0, 4, 4, 0, 0, 4, 4, 0, 4, 0, 0, 4
};
void z80loop(unsigned char *data,unsigned char *stacketc)
{
unsigned char a, f, b, c, d, e, h, l;
unsigned char r, a1, f1, b1, c1, d1, e1, h1, l1, i, iff1, iff2, im;
unsigned short pc;
unsigned short ix, iy, sp;
unsigned int radjust;
unsigned int ixoriy, new_ixoriy;
unsigned int intsample;
unsigned char op;
int interrupted=0;
a=f=b=c=d=e=h=l=a1=f1=b1=c1=d1=e1=h1=l1=i=r=iff1=iff2=im=0;
ixoriy=new_ixoriy=0;
ix=iy=sp=pc=0;
tstates=0;
radjust=0;
a=a1=b=b1=d=d1=h=h1=data[8];
f=f1=c=c1=e=e1=l=l1=data[9];
ix=iy=hl;
sp=stacketc[0]*256+stacketc[1];
while(1)
{
if(tstates>=tsmax)
{
do
{
if(!do_interrupt())
{
/* they want to exit */
return;
}
}
while(playing && paused); /* when it's paused, we'd better wait here */
tstates-=tsmax;
interrupted=1;
}
ixoriy=new_ixoriy;
new_ixoriy=0;
intsample=1;
op=fetch(pc);
pc++;
radjust++;
switch(op)
{
#include "z80ops.c"
}
if(interrupted && intsample && iff1)
{
interrupted=0;
if(fetch(pc)==0x76)pc++;
iff1=iff2=0;
tstates+=5; /* accompanied by an input from the data bus */
switch(im)
{
case 0: /* IM 0 */
case 1: /* undocumented */
case 2: /* IM 1 */
/* there is little to distinguish between these cases */
tstates+=7; /* perhaps */
push2(pc);
pc=0x38;
break;
case 3: /* IM 2 */
tstates+=13; /* perhaps */
{
int addr=fetch2((i<<8)|0xff);
push2(pc);
pc=addr;
}
}
}
}
}
|
