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/*
* c64parallel.c - Parallel cable handling for the C64.
*
* Written by
* Andreas Boose <viceteam@t-online.de>
*
* This file is part of VICE, the Versatile Commodore Emulator.
* See README for copyright notice.
*
* 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., 59 Temple Place, Suite 330, Boston, MA
* 02111-1307 USA.
*
*/
#include "vice.h"
#include "c64.h"
#include "c64parallel.h"
#include "cia.h"
#include "drive.h"
#include "drivecpu.h"
#include "drivetypes.h"
#include "iecdrive.h"
#include "maincpu.h"
#include "mc6821.h"
#include "types.h"
#include "via.h"
static BYTE parallel_cable_cpu_value = 0xff;
static BYTE parallel_cable_drive_value[DRIVE_NUM] = { 0xff, 0xff, 0xff, 0xff };
static BYTE parallel_cable_value(void)
{
unsigned int dnr;
BYTE val;
val = parallel_cable_cpu_value;
for (dnr = 0; dnr < DRIVE_NUM; dnr++) {
if (drive_context[dnr]->drive->enable
&& drive_context[dnr]->drive->parallel_cable)
val &= parallel_cable_drive_value[dnr];
}
return val;
}
void parallel_cable_drive_write(BYTE data, int handshake, unsigned int dnr)
{
#if 0
log_debug("DW DATA %02x HS %02x", data, handshake);
#endif
if (handshake == PARALLEL_WRITE_HS || handshake == PARALLEL_HS)
ciacore_set_flag(machine_context.cia2);
if (handshake == PARALLEL_WRITE_HS || handshake == PARALLEL_WRITE)
parallel_cable_drive_value[dnr] = data;
}
BYTE parallel_cable_drive_read(int handshake)
{
BYTE rc;
if (handshake)
ciacore_set_flag(machine_context.cia2);
rc = parallel_cable_value();
#if 0
log_debug("DR DATA %02x HS %02x", rc, handshake);
#endif
return rc;
}
void parallel_cable_cpu_execute(void)
{
unsigned int dnr;
for (dnr = 0; dnr < DRIVE_NUM; dnr++) {
if (drive_context[dnr]->drive->enable
&& drive_context[dnr]->drive->parallel_cable)
drivecpu_execute(drive_context[dnr], maincpu_clk);
}
}
void parallel_cable_cpu_write(BYTE data)
{
parallel_cable_cpu_execute();
parallel_cable_cpu_value = data;
#if 0
log_debug("CW DATA %02x", data);
#endif
}
BYTE parallel_cable_cpu_read(void)
{
BYTE rc;
parallel_cable_cpu_execute();
rc = parallel_cable_value();
#if 0
log_debug("CR %02x", rc);
#endif
return rc;
}
void parallel_cable_cpu_pulse(void)
{
unsigned int dnr;
parallel_cable_cpu_execute();
#if 0
log_debug("CP");
#endif
for (dnr = 0; dnr < DRIVE_NUM; dnr++) {
drive_t *drive;
drive = drive_context[dnr]->drive;
if (drive->enable && drive->parallel_cable) {
if (drive->parallel_cable == DRIVE_PC_DD3)
mc6821_set_signal(drive_context[dnr], MC6821_SIG_CA1);
else if (drive->type == DRIVE_TYPE_1570
|| drive->type == DRIVE_TYPE_1571
|| drive->type == DRIVE_TYPE_1571CR)
ciacore_set_flag(drive_context[dnr]->cia1571);
else
viacore_signal(drive_context[dnr]->via1d1541, VIA_SIG_CB1,
VIA_SIG_FALL);
}
}
}
void parallel_cable_cpu_undump(BYTE data)
{
parallel_cable_cpu_value = data;
}
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