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/* pentagon1024.c: Pentagon 1024 specific routines This machine is expected to
be a post-1996 Pentagon (a 1024k v2.2 1024SL?).
Copyright (c) 1999-2007 Philip Kendall and Fredrick Meunier
$Id: pentagon1024.c 4099 2009-10-22 10:59:02Z fredm $
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.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
Author contact information:
E-mail: philip-fuse@shadowmagic.org.uk
*/
#include <config.h>
#include <libspectrum.h>
#include "compat.h"
#include "disk/beta.h"
#include "joystick.h"
#include "machine.h"
#include "machines.h"
#include "memory.h"
#include "pentagon.h"
#include "periph.h"
#include "settings.h"
#include "spec128.h"
#include "spec48.h"
#include "ula.h"
static int pentagon1024_reset( void );
static void pentagon1024_memoryport_write( libspectrum_word port GCC_UNUSED,
libspectrum_byte b);
static void pentagon1024_v22_memoryport_write( libspectrum_word port GCC_UNUSED,
libspectrum_byte b);
static int pentagon1024_memory_map( void );
static const periph_t peripherals[] = {
{ 0x00ff, 0x001f, pentagon_select_1f_read, beta_cr_write },
{ 0x00ff, 0x003f, beta_tr_read, beta_tr_write },
{ 0x00ff, 0x005f, beta_sec_read, beta_sec_write },
{ 0x00ff, 0x007f, beta_dr_read, beta_dr_write },
{ 0x00ff, 0x00fe, ula_read, ula_write },
{ 0x00ff, 0x00ff, beta_sp_read, beta_sp_write },
{ 0xc002, 0xc000, ay_registerport_read, ay_registerport_write },
{ 0xc002, 0x8000, NULL, ay_dataport_write },
{ 0xc002, 0x4000, NULL, pentagon1024_memoryport_write },
{ 0xf008, 0xe000, NULL, pentagon1024_v22_memoryport_write }, /* v2.2 */
};
static const size_t peripherals_count =
sizeof( peripherals ) / sizeof( periph_t );
int
pentagon1024_init( fuse_machine_info *machine )
{
int i;
machine->machine = LIBSPECTRUM_MACHINE_PENT1024;
machine->id = "pentagon1024";
machine->reset = pentagon1024_reset;
machine->timex = 0;
machine->ram.port_from_ula = pentagon_port_from_ula;
machine->ram.contend_delay = spectrum_contend_delay_none;
machine->ram.contend_delay_no_mreq = spectrum_contend_delay_none;
machine->unattached_port = spectrum_unattached_port_none;
machine->shutdown = NULL;
machine->memory_map = pentagon1024_memory_map;
for( i = 0; i < 2; i++ ) beta_memory_map_romcs[i].bank = MEMORY_BANK_ROMCS;
return 0;
}
static int
pentagon1024_reset(void)
{
int error;
int i;
error = machine_load_rom( 0, 0, settings_current.rom_pentagon1024_0,
settings_default.rom_pentagon1024_0, 0x4000 );
if( error ) return error;
error = machine_load_rom( 2, 1, settings_current.rom_pentagon1024_1,
settings_default.rom_pentagon1024_1, 0x4000 );
if( error ) return error;
error = machine_load_rom( 4, 2, settings_current.rom_pentagon1024_3,
settings_default.rom_pentagon1024_3, 0x4000 );
if( error ) return error;
error = machine_load_rom_bank( beta_memory_map_romcs, 0, 0,
settings_current.rom_pentagon1024_2,
settings_default.rom_pentagon1024_2, 0x4000 );
if( error ) return error;
error = spec128_common_reset( 0 );
if( error ) return error;
machine_current->ram.last_byte2 = 0;
machine_current->ram.special = 0;
/* Mark the least 896K as present/writeable */
for( i = 16; i < 128; i++ )
memory_map_ram[i].writable = 1;
beta_builtin = 1;
beta_active = 1;
error = periph_setup( peripherals, peripherals_count );
if( error ) return error;
periph_setup_kempston( PERIPH_PRESENT_OPTIONAL );
periph_setup_beta128( PERIPH_PRESENT_ALWAYS );
periph_update();
spec48_common_display_setup();
return 0;
}
static void
pentagon1024_memoryport_write( libspectrum_word port GCC_UNUSED,
libspectrum_byte b )
{
if( machine_current->ram.locked ) return;
machine_current->ram.last_byte = b;
machine_current->memory_map();
if( machine_current->ram.last_byte2 & 0x04 ) /* v2.2 */
machine_current->ram.locked = b & 0x20;
}
static void
pentagon1024_v22_memoryport_write( libspectrum_word port GCC_UNUSED,
libspectrum_byte b)
{
if( machine_current->ram.locked ) return;
machine_current->ram.last_byte2 = b;
if( b & 0x01 ) {
display_dirty = display_dirty_pentagon_16_col;
display_write_if_dirty = display_write_if_dirty_pentagon_16_col;
display_dirty_flashing = display_dirty_flashing_pentagon_16_col;
memory_display_dirty = memory_display_dirty_pentagon_16_col;
} else {
spec48_common_display_setup();
}
machine_current->memory_map();
}
static int pentagon1024_memory_map( void )
{
int rom, page, screen;
size_t i;
screen = ( machine_current->ram.last_byte & 0x08 ) ? 7 : 5;
if( memory_current_screen != screen ) {
display_update_critical( 0, 0 );
display_refresh_main_screen();
memory_current_screen = screen;
}
if( beta_active && !( machine_current->ram.last_byte & 0x10 ) ) {
rom = 2;
} else {
rom = ( machine_current->ram.last_byte & 0x10 ) >> 4;
}
machine_current->ram.current_rom = rom;
if( machine_current->ram.last_byte2 & 0x08 ) {
memory_map_home[0] = &memory_map_ram[ 0 ]; /* v2.2 */
memory_map_home[1] = &memory_map_ram[ 1 ]; /* v2.2 */
machine_current->ram.special = 1; /* v2.2 */
} else {
spec128_select_rom( rom );
}
page = ( machine_current->ram.last_byte & 0x07 );
if( !( machine_current->ram.last_byte2 & 0x04 ) ) {
page += ( ( machine_current->ram.last_byte & 0xC0 ) >> 3 ) +
( machine_current->ram.last_byte & 0x20 );
}
spec128_select_page( page );
machine_current->ram.current_page = page;
for( i = 0; i < 8; i++ )
memory_map_read[i] = memory_map_write[i] = *memory_map_home[i];
memory_romcs_map();
return 0;
}
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