/***************************************************************************
machine.c
Functions to emulate general aspects of the machine (RAM, ROM, interrupts,
I/O ports)
***************************************************************************/
#include "driver.h"
/*Creation date: 98-02-18 */
/* A few words of comment:
**
** What's inside of this file is a PAL16R6 emulator. Maybe someday we will
**need to use it for some other game too. We will need to make it more exact
**then (some of the functionality of this chip IS NOT implemented). However I
**have bought a book about PALs and I'm able to improve it. Just LMK.
** Jarek Burczynski
** bujar at mame dot net
*/
/*table holds outputs of all ANDs (after AND map)*/
static UINT8 andmap[64];
/*table holds inputs (ie. not x, x, not q, q) to the AND map*/
static UINT8 columnvalue[32];
/*8 output pins (actually 6 output and 2 input/output)*/
static UINT8 outvalue[8];
/* 64 rows x 32 columns
** 1 - fuse blown: disconnected from input (equal to 1)
** 0 - fuse not blown: connected to input (ie. x, not x, q, not q accordingly)
*/
static UINT8 fusemap[64*32]=
{
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,0,1,1,1,1,0,1,1,0,1,1,1,1,0,1,1,0,1,1,1,0,1,1,1,1,1,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1,1,0,1,1,1,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1,1,0,1,1,1,0,1,1,1,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,0,1,1,1,1,0,1,1,1,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1,1,0,1,1,1,0,1,1,1,0,1,1,1,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,0,1,1,1,1,0,1,1,1,1,1,1,1,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,0,1,1,1,1,1,1,1,1,0,1,1,1,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1,1,0,1,1,1,0,1,1,1,0,1,1,1,0,1,1,1,0,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,0,1,1,1,1,0,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,0,1,1,1,1,1,1,1,1,0,1,1,1,1,1,1,1,0,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,0,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,0,1,1,1,1,1,1,1,1,1,1,1,1,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1,1,0,1,1,1,0,1,1,1,0,1,1,1,0,1,1,1,0,1,1,1,0,1,1,1,1,1,1,1,1,1,
1,1,0,1,1,1,1,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,1,1,1,1,
1,1,0,1,1,1,1,1,1,1,1,0,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,1,1,1,1,
1,1,0,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,1,1,1,0,1,1,1,1,1,1,1,1,
1,1,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,0,1,1,1,1,1,1,1,1,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1,1,0,1,1,1,0,1,1,1,0,1,1,1,0,1,1,1,0,1,1,1,0,1,1,1,0,1,1,1,1,1,
1,1,0,1,1,1,1,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,
1,1,0,1,1,1,1,1,1,1,1,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,
1,1,0,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,
1,1,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,1,1,1,0,1,1,1,1,
1,1,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,0,1,1,1,1,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
};
static void update_pal(void)
{
UINT16 rowoffs;
UINT8 row, column, val;
/*calculate all rows ANDs*/
for (row = 0; row < 64; row++)
{
rowoffs = row*32;
val = 1; /*prepare for AND */
for (column = 0; column < 32; column++)
{
if ( fusemap[ rowoffs + column ] == 0 )
val &= columnvalue[column];
}
andmap[row] = val;
}
/* I/O pin #19 */
val = 0; /*prepare for OR*/
for (row = 1; row < 8; row++)
val |= andmap[row];
if (andmap[0] == 1)
{
columnvalue[2] = 1-val;
columnvalue[3] = val;
outvalue[0] = 1-val;
}
else
{
/*pin is in INPUT configuration so it doesn't create output...*/
columnvalue[2] = 0;
columnvalue[3] = 1;
}
/* O pin #18 (D1) */
val = 0; /*prepare for OR*/
for (row = 8; row < 16; row++)
val |= andmap[row];
columnvalue[6] = 1-val;
columnvalue[7] = val;
outvalue[1] = 1-val;
/* O pin #17 (D2) */
val = 0; /*prepare for OR*/
for (row = 16; row < 24; row++)
val |= andmap[row];
columnvalue[10] = 1-val;
columnvalue[11] = val;
outvalue[2] = 1-val;
/* O pin #16 (D3) */
val = 0; /*prepare for OR*/
for (row = 24; row < 32; row++)
val |= andmap[row];
columnvalue[14] = 1-val;
columnvalue[15] = val;
outvalue[3] = 1-val;
/* O pin #15 (D4) */
val = 0; /*prepare for OR*/
for (row = 32; row < 40; row++)
val |= andmap[row];
columnvalue[18] = 1-val;
columnvalue[19] = val;
outvalue[4] = 1-val;
/* O pin #14 (D5) */
val = 0; /*prepare for OR*/
for (row = 40; row < 48; row++)
val |= andmap[row];
columnvalue[22] = 1-val;
columnvalue[23] = val;
outvalue[5] = 1-val;
/* O pin #13 (D6) */
val = 0; /*prepare for OR*/
for (row = 48; row < 56; row++)
val |= andmap[row];
columnvalue[26] = 1-val;
columnvalue[27] = val;
outvalue[6] = 1-val;
/* I/O pin #12 */
val = 0; /*prepare for OR*/
for (row = 57; row < 64; row++)
val |= andmap[row];
if (andmap[56] == 1)
{
columnvalue[30] = 1-val;
columnvalue[31] = val;
outvalue[7] = 1-val;
}
else
{
/*pin is in INPUT configuration so it doesn't create output...*/
columnvalue[30] = 0;
columnvalue[31] = 1;
}
}
WRITE8_HANDLER( bagman_pal16r6_w )
{
UINT8 line;
line = offset*4;
columnvalue[line ] = data&1;
columnvalue[line+1] = 1-(data&1);
}
MACHINE_RESET( bagman )
{
bagman_pal16r6_w(0,1); /*pin 2*/
bagman_pal16r6_w(1,1); /*pin 3*/
bagman_pal16r6_w(2,1); /*pin 4*/
bagman_pal16r6_w(3,1); /*pin 5*/
bagman_pal16r6_w(4,1); /*pin 6*/
bagman_pal16r6_w(5,1); /*pin 7*/
bagman_pal16r6_w(6,1); /*pin 8*/
bagman_pal16r6_w(7,1); /*pin 9*/
update_pal();
}
READ8_HANDLER( bagman_pal16r6_r )
{
update_pal();
return (outvalue[6]) + (outvalue[5]<<1) + (outvalue[4]<<2) +
(outvalue[3]<<3) + (outvalue[2]<<4) + (outvalue[1]<<5);
/* Bagman schematics show that this is right mapping order of PAL outputs to bits.
** This is the PAL 16R6 shown almost in the middle of the schematics.
** The /RD4 line goes low (active) whenever CPU reads from memory address a000.
*/
}