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memory.c
1047 lines (992 loc) · 31.3 KB
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memory.c
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/*
* memory.c - memory emulation
*
* Copyright (C) 1995-1998 David Firth
* Copyright (C) 1998-2008 Atari800 development team (see DOC/CREDITS)
*
* This file is part of the Atari800 emulator project which emulates
* the Atari 400, 800, 800XL, 130XE, and 5200 8-bit computers.
*
* Atari800 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.
*
* Atari800 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 Atari800; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "atari.h"
#include "antic.h"
#include "cpu.h"
#include "cartridge.h"
#include "esc.h"
#include "gtia.h"
#include "log.h"
#include "memory.h"
#include "pbi.h"
#include "pia.h"
#include "pokey.h"
#include "util.h"
#ifndef BASIC
#include "statesav.h"
#endif
UBYTE MEMORY_mem[65536 + 2];
int MEMORY_ram_size = 64;
#ifndef PAGED_ATTRIB
UBYTE MEMORY_attrib[65536];
#else /* PAGED_ATTRIB */
MEMORY_rdfunc MEMORY_readmap[256];
MEMORY_wrfunc MEMORY_writemap[256];
typedef struct map_save {
int code;
MEMORY_rdfunc rdptr;
MEMORY_wrfunc wrptr;
} map_save;
void MEMORY_ROM_PutByte(UWORD addr, UBYTE value)
{
}
map_save save_map[2] = {
{0, NULL, NULL}, /* RAM */
{1, NULL, MEMORY_ROM_PutByte} /* ROM */
};
#endif /* PAGED_ATTRIB */
UBYTE MEMORY_basic[8192];
UBYTE MEMORY_os[16384];
int MEMORY_xe_bank = 0;
int MEMORY_selftest_enabled = 0;
static UBYTE under_atarixl_os[16384];
static UBYTE under_atari_basic[8192];
static UBYTE *atarixe_memory = NULL;
static ULONG atarixe_memory_size = 0;
int MEMORY_have_basic = FALSE; /* Atari BASIC image has been successfully read (Atari 800 only) */
/* Axlon and Mosaic RAM expansions for Atari 400/800 only */
static void MosaicPutByte(UWORD addr, UBYTE byte);
static UBYTE MosaicGetByte(UWORD addr);
static void AxlonPutByte(UWORD addr, UBYTE byte);
static UBYTE AxlonGetByte(UWORD addr);
static UBYTE *axlon_ram = NULL;
static int axlon_ram_size = 0;
int axlon_curbank = 0;
int MEMORY_axlon_bankmask = 0x07;
int MEMORY_axlon_enabled = FALSE;
int MEMORY_axlon_0f_mirror = FALSE; /* The real Axlon had a mirror bank register at 0x0fc0-0x0fff, compatibles did not*/
static UBYTE *mosaic_ram = NULL;
static int mosaic_ram_size = 0;
static int mosaic_curbank = 0x3f;
int MEMORY_mosaic_maxbank = 0;
int MEMORY_mosaic_enabled = FALSE;
static void alloc_axlon_memory(void){
axlon_curbank = 0;
if (MEMORY_axlon_enabled && (Atari800_machine_type == Atari800_MACHINE_OSA || Atari800_machine_type == Atari800_MACHINE_OSB )) {
int new_axlon_ram_size = (MEMORY_axlon_bankmask+1)*0x4000;
if ((axlon_ram == NULL) || (axlon_ram_size != new_axlon_ram_size)) {
axlon_ram_size = new_axlon_ram_size;
if (axlon_ram != NULL) free(axlon_ram);
axlon_ram = (UBYTE *)Util_malloc(axlon_ram_size);
}
memset(axlon_ram, 0, axlon_ram_size);
} else {
if (axlon_ram != NULL) {
free(axlon_ram);
axlon_ram_size = 0;
}
}
}
static void alloc_mosaic_memory(void){
mosaic_curbank = 0x3f;
if (MEMORY_mosaic_enabled && (Atari800_machine_type == Atari800_MACHINE_OSA || Atari800_machine_type == Atari800_MACHINE_OSB)) {
int new_mosaic_ram_size = (MEMORY_mosaic_maxbank+1)*0x1000;
if ((mosaic_ram == NULL) || (mosaic_ram_size != new_mosaic_ram_size)) {
mosaic_ram_size = new_mosaic_ram_size;
if (mosaic_ram != NULL) free(mosaic_ram);
mosaic_ram = (UBYTE *)Util_malloc(mosaic_ram_size);
}
memset(mosaic_ram, 0, mosaic_ram_size);
} else {
if (mosaic_ram != NULL) {
free(mosaic_ram);
mosaic_ram_size = 0;
}
}
}
static void AllocXEMemory(void)
{
if (MEMORY_ram_size > 64) {
/* don't count 64 KB of base memory */
/* count number of 16 KB banks, add 1 for saving base memory 0x4000-0x7fff */
ULONG size = (1 + (MEMORY_ram_size - 64) / 16) * 16384;
if (size != atarixe_memory_size) {
if (atarixe_memory != NULL)
free(atarixe_memory);
atarixe_memory = (UBYTE *) Util_malloc(size);
atarixe_memory_size = size;
memset(atarixe_memory, 0, size);
}
}
/* atarixe_memory not needed, free it */
else if (atarixe_memory != NULL) {
free(atarixe_memory);
atarixe_memory = NULL;
atarixe_memory_size = 0;
}
}
void MEMORY_InitialiseMachine(void)
{
ANTIC_xe_ptr = NULL;
switch (Atari800_machine_type) {
case Atari800_MACHINE_OSA:
case Atari800_MACHINE_OSB:
memcpy(MEMORY_mem + 0xd800, MEMORY_os, 0x2800);
ESC_PatchOS();
MEMORY_dFillMem(0x0000, 0x00, MEMORY_ram_size * 1024 - 1);
MEMORY_SetRAM(0x0000, MEMORY_ram_size * 1024 - 1);
if (MEMORY_ram_size < 52) {
MEMORY_dFillMem(MEMORY_ram_size * 1024, 0xff, 0xd000 - MEMORY_ram_size * 1024);
MEMORY_SetROM(MEMORY_ram_size * 1024, 0xcfff);
}
MEMORY_SetROM(0xd800, 0xffff);
#ifndef PAGED_ATTRIB
MEMORY_SetHARDWARE(0xd000, 0xd7ff);
if (MEMORY_mosaic_enabled) MEMORY_SetHARDWARE(0xff00, 0xffff);
/* only 0xffc0-0xffff are used, but mark the whole
* page to make state saving easier */
if (MEMORY_axlon_enabled) {
MEMORY_SetHARDWARE(0xcf00, 0xcfff);
if (MEMORY_axlon_0f_mirror) MEMORY_SetHARDWARE(0x0f00, 0x0fff);
/* only ?fc0-?fff are used, but mark the whole page*/
}
#else
MEMORY_readmap[0xd0] = GTIA_GetByte;
MEMORY_readmap[0xd1] = PBI_D1GetByte;
MEMORY_readmap[0xd2] = POKEY_GetByte;
MEMORY_readmap[0xd3] = PIA_GetByte;
MEMORY_readmap[0xd4] = ANTIC_GetByte;
MEMORY_readmap[0xd5] = CARTRIDGE_GetByte;
MEMORY_readmap[0xd6] = PBI_D6GetByte;
MEMORY_readmap[0xd7] = PBI_D7GetByte;
MEMORY_writemap[0xd0] = GTIA_PutByte;
MEMORY_writemap[0xd1] = PBI_D1PutByte;
MEMORY_writemap[0xd2] = POKEY_PutByte;
MEMORY_writemap[0xd3] = PIA_PutByte;
MEMORY_writemap[0xd4] = ANTIC_PutByte;
MEMORY_writemap[0xd5] = CARTRIDGE_PutByte;
MEMORY_writemap[0xd6] = PBI_D6PutByte;
MEMORY_writemap[0xd7] = PBI_D7PutByte;
if (MEMORY_mosaic_enabled) MEMORY_writemap[0xff] = MosaicPutByte;
if (MEMORY_axlon_enabled) MEMORY_writemap[0xcf] = AxlonPutByte;
if (MEMORY_axlon_enabled && MEMORY_axlon_0f_mirror) MEMORY_writemap[0x0f] = AxlonPutByte;
#endif
break;
case Atari800_MACHINE_XLXE:
memcpy(MEMORY_mem + 0xc000, MEMORY_os, 0x4000);
ESC_PatchOS();
if (MEMORY_ram_size == 16) {
MEMORY_dFillMem(0x0000, 0x00, 0x4000);
MEMORY_SetRAM(0x0000, 0x3fff);
MEMORY_dFillMem(0x4000, 0xff, 0x8000);
MEMORY_SetROM(0x4000, 0xcfff);
} else {
MEMORY_dFillMem(0x0000, 0x00, 0xc000);
MEMORY_SetRAM(0x0000, 0xbfff);
MEMORY_SetROM(0xc000, 0xcfff);
}
#ifndef PAGED_ATTRIB
MEMORY_SetHARDWARE(0xd000, 0xd7ff);
#else
MEMORY_readmap[0xd0] = GTIA_GetByte;
MEMORY_readmap[0xd1] = PBI_D1GetByte;
MEMORY_readmap[0xd2] = POKEY_GetByte;
MEMORY_readmap[0xd3] = PIA_GetByte;
MEMORY_readmap[0xd4] = ANTIC_GetByte;
MEMORY_readmap[0xd5] = CARTRIDGE_GetByte;
MEMORY_readmap[0xd6] = PBI_D6GetByte;
MEMORY_readmap[0xd7] = PBI_D7GetByte;
MEMORY_writemap[0xd0] = GTIA_PutByte;
MEMORY_writemap[0xd1] = PBI_D1PutByte;
MEMORY_writemap[0xd2] = POKEY_PutByte;
MEMORY_writemap[0xd3] = PIA_PutByte;
MEMORY_writemap[0xd4] = ANTIC_PutByte;
MEMORY_writemap[0xd5] = CARTRIDGE_PutByte;
MEMORY_writemap[0xd6] = PBI_D6PutByte;
MEMORY_writemap[0xd7] = PBI_D7PutByte;
#endif
MEMORY_SetROM(0xd800, 0xffff);
break;
case Atari800_MACHINE_5200:
memcpy(MEMORY_mem + 0xf800, MEMORY_os, 0x800);
MEMORY_dFillMem(0x0000, 0x00, 0xf800);
MEMORY_SetRAM(0x0000, 0x3fff);
MEMORY_SetROM(0x4000, 0xffff);
#ifndef PAGED_ATTRIB
MEMORY_SetHARDWARE(0xc000, 0xcfff); /* 5200 GTIA Chip */
MEMORY_SetHARDWARE(0xd400, 0xd4ff); /* 5200 ANTIC Chip */
MEMORY_SetHARDWARE(0xe800, 0xefff); /* 5200 POKEY Chip */
#else
MEMORY_readmap[0xc0] = GTIA_GetByte;
MEMORY_readmap[0xc1] = GTIA_GetByte;
MEMORY_readmap[0xc2] = GTIA_GetByte;
MEMORY_readmap[0xc3] = GTIA_GetByte;
MEMORY_readmap[0xc4] = GTIA_GetByte;
MEMORY_readmap[0xc5] = GTIA_GetByte;
MEMORY_readmap[0xc6] = GTIA_GetByte;
MEMORY_readmap[0xc7] = GTIA_GetByte;
MEMORY_readmap[0xc8] = GTIA_GetByte;
MEMORY_readmap[0xc9] = GTIA_GetByte;
MEMORY_readmap[0xca] = GTIA_GetByte;
MEMORY_readmap[0xcb] = GTIA_GetByte;
MEMORY_readmap[0xcc] = GTIA_GetByte;
MEMORY_readmap[0xcd] = GTIA_GetByte;
MEMORY_readmap[0xce] = GTIA_GetByte;
MEMORY_readmap[0xcf] = GTIA_GetByte;
MEMORY_readmap[0xd4] = ANTIC_GetByte;
MEMORY_readmap[0xe8] = POKEY_GetByte;
MEMORY_readmap[0xe9] = POKEY_GetByte;
MEMORY_readmap[0xea] = POKEY_GetByte;
MEMORY_readmap[0xeb] = POKEY_GetByte;
MEMORY_readmap[0xec] = POKEY_GetByte;
MEMORY_readmap[0xed] = POKEY_GetByte;
MEMORY_readmap[0xee] = POKEY_GetByte;
MEMORY_readmap[0xef] = POKEY_GetByte;
MEMORY_writemap[0xc0] = GTIA_PutByte;
MEMORY_writemap[0xc1] = GTIA_PutByte;
MEMORY_writemap[0xc2] = GTIA_PutByte;
MEMORY_writemap[0xc3] = GTIA_PutByte;
MEMORY_writemap[0xc4] = GTIA_PutByte;
MEMORY_writemap[0xc5] = GTIA_PutByte;
MEMORY_writemap[0xc6] = GTIA_PutByte;
MEMORY_writemap[0xc7] = GTIA_PutByte;
MEMORY_writemap[0xc8] = GTIA_PutByte;
MEMORY_writemap[0xc9] = GTIA_PutByte;
MEMORY_writemap[0xca] = GTIA_PutByte;
MEMORY_writemap[0xcb] = GTIA_PutByte;
MEMORY_writemap[0xcc] = GTIA_PutByte;
MEMORY_writemap[0xcd] = GTIA_PutByte;
MEMORY_writemap[0xce] = GTIA_PutByte;
MEMORY_writemap[0xcf] = GTIA_PutByte;
MEMORY_writemap[0xd4] = ANTIC_PutByte;
MEMORY_writemap[0xe8] = POKEY_PutByte;
MEMORY_writemap[0xe9] = POKEY_PutByte;
MEMORY_writemap[0xea] = POKEY_PutByte;
MEMORY_writemap[0xeb] = POKEY_PutByte;
MEMORY_writemap[0xec] = POKEY_PutByte;
MEMORY_writemap[0xed] = POKEY_PutByte;
MEMORY_writemap[0xee] = POKEY_PutByte;
MEMORY_writemap[0xef] = POKEY_PutByte;
#endif
break;
}
AllocXEMemory();
alloc_axlon_memory();
alloc_mosaic_memory();
Atari800_Coldstart();
}
#ifndef BASIC
void MEMORY_StateSave(UBYTE SaveVerbose)
{
/* Axlon/Mosaic for 400/800 */
if (Atari800_machine_type == Atari800_MACHINE_OSA || Atari800_machine_type == Atari800_MACHINE_OSB) {
StateSav_SaveINT(&MEMORY_axlon_enabled, 1);
if (MEMORY_axlon_enabled){
StateSav_SaveINT(&axlon_curbank, 1);
StateSav_SaveINT(&MEMORY_axlon_bankmask, 1);
StateSav_SaveINT(&MEMORY_axlon_0f_mirror, 1);
StateSav_SaveINT(&axlon_ram_size, 1);
StateSav_SaveUBYTE(&axlon_ram[0], axlon_ram_size);
}
StateSav_SaveINT(&MEMORY_mosaic_enabled, 1);
if (MEMORY_mosaic_enabled){
StateSav_SaveINT(&mosaic_curbank, 1);
StateSav_SaveINT(&MEMORY_mosaic_maxbank, 1);
StateSav_SaveINT(&mosaic_ram_size, 1);
StateSav_SaveUBYTE(&mosaic_ram[0], mosaic_ram_size);
}
}
StateSav_SaveUBYTE(&MEMORY_mem[0], 65536);
#ifndef PAGED_ATTRIB
StateSav_SaveUBYTE(&MEMORY_attrib[0], 65536);
#else
{
/* I assume here that consecutive calls to StateSav_SaveUBYTE()
are equivalent to a single call with all the values
(i.e. StateSav_SaveUBYTE() doesn't write any headers). */
UBYTE attrib_page[256];
int i;
for (i = 0; i < 256; i++) {
if (MEMORY_writemap[i] == NULL)
memset(attrib_page, MEMORY_RAM, 256);
else if (MEMORY_writemap[i] == MEMORY_ROM_PutByte)
memset(attrib_page, MEMORY_ROM, 256);
else if (i == 0x4f || i == 0x5f || i == 0x8f || i == 0x9f) {
/* special case: Bounty Bob bank switching registers */
memset(attrib_page, MEMORY_ROM, 256);
attrib_page[0xf6] = MEMORY_HARDWARE;
attrib_page[0xf7] = MEMORY_HARDWARE;
attrib_page[0xf8] = MEMORY_HARDWARE;
attrib_page[0xf9] = MEMORY_HARDWARE;
}
else {
memset(attrib_page, MEMORY_HARDWARE, 256);
}
StateSav_SaveUBYTE(&attrib_page[0], 256);
}
}
#endif
if (Atari800_machine_type == Atari800_MACHINE_XLXE) {
if (SaveVerbose != 0)
StateSav_SaveUBYTE(&MEMORY_basic[0], 8192);
StateSav_SaveUBYTE(&under_atari_basic[0], 8192);
if (SaveVerbose != 0)
StateSav_SaveUBYTE(&MEMORY_os[0], 16384);
StateSav_SaveUBYTE(&under_atarixl_os[0], 16384);
}
if (MEMORY_ram_size > 64) {
StateSav_SaveUBYTE(&atarixe_memory[0], atarixe_memory_size);
/* a hack that makes state files compatible with previous versions:
for 130 XE there's written 192 KB of unused data */
if (MEMORY_ram_size == 128) {
UBYTE buffer[256];
int i;
memset(buffer, 0, 256);
for (i = 0; i < 192 * 4; i++)
StateSav_SaveUBYTE(&buffer[0], 256);
}
}
}
void MEMORY_StateRead(UBYTE SaveVerbose, UBYTE StateVersion)
{
/* Axlon/Mosaic for 400/800 */
if ((Atari800_machine_type == Atari800_MACHINE_OSA || Atari800_machine_type == Atari800_MACHINE_OSB) && StateVersion >= 5) {
StateSav_ReadINT(&MEMORY_axlon_enabled, 1);
if (MEMORY_axlon_enabled){
StateSav_ReadINT(&axlon_curbank, 1);
StateSav_ReadINT(&MEMORY_axlon_bankmask, 1);
StateSav_ReadINT(&MEMORY_axlon_0f_mirror, 1);
StateSav_ReadINT(&axlon_ram_size, 1);
alloc_axlon_memory();
StateSav_ReadUBYTE(&axlon_ram[0], axlon_ram_size);
}
StateSav_ReadINT(&MEMORY_mosaic_enabled, 1);
if (MEMORY_mosaic_enabled){
StateSav_ReadINT(&mosaic_curbank, 1);
StateSav_ReadINT(&MEMORY_mosaic_maxbank, 1);
StateSav_ReadINT(&mosaic_ram_size, 1);
alloc_mosaic_memory();
StateSav_ReadUBYTE(&mosaic_ram[0], mosaic_ram_size);
}
}
StateSav_ReadUBYTE(&MEMORY_mem[0], 65536);
#ifndef PAGED_ATTRIB
StateSav_ReadUBYTE(&MEMORY_attrib[0], 65536);
#else
{
UBYTE attrib_page[256];
int i;
for (i = 0; i < 256; i++) {
StateSav_ReadUBYTE(&attrib_page[0], 256);
/* note: 0x40 is intentional here:
we want ROM on page 0xd1 if H: patches are enabled */
switch (attrib_page[0x40]) {
case MEMORY_RAM:
MEMORY_readmap[i] = NULL;
MEMORY_writemap[i] = NULL;
break;
case MEMORY_ROM:
if (i != 0xd1 && attrib_page[0xf6] == MEMORY_HARDWARE) {
if (i == 0x4f || i == 0x8f) {
MEMORY_readmap[i] = CARTRIDGE_BountyBob1GetByte;
MEMORY_writemap[i] = CARTRIDGE_BountyBob1PutByte;
}
else if (i == 0x5f || i == 0x9f) {
MEMORY_readmap[i] = CARTRIDGE_BountyBob2GetByte;
MEMORY_writemap[i] = CARTRIDGE_BountyBob2PutByte;
}
/* else something's wrong, so we keep current values */
}
else {
MEMORY_readmap[i] = NULL;
MEMORY_writemap[i] = MEMORY_ROM_PutByte;
}
break;
case MEMORY_HARDWARE:
switch (i) {
case 0xc0:
case 0xd0:
MEMORY_readmap[i] = GTIA_GetByte;
MEMORY_writemap[i] = GTIA_PutByte;
break;
case 0xd1:
MEMORY_readmap[i] = PBI_D1GetByte;
MEMORY_writemap[i] = PBI_D1PutByte;
break;
case 0xd2:
case 0xe8:
case 0xeb:
MEMORY_readmap[i] = POKEY_GetByte;
MEMORY_writemap[i] = POKEY_PutByte;
break;
case 0xd3:
MEMORY_readmap[i] = PIA_GetByte;
MEMORY_writemap[i] = PIA_PutByte;
break;
case 0xd4:
MEMORY_readmap[i] = ANTIC_GetByte;
MEMORY_writemap[i] = ANTIC_PutByte;
break;
case 0xd5:
MEMORY_readmap[i] = CARTRIDGE_GetByte;
MEMORY_writemap[i] = CARTRIDGE_PutByte;
break;
case 0xd6:
MEMORY_readmap[i] = PBI_D6GetByte;
MEMORY_writemap[i] = PBI_D6PutByte;
break;
case 0xd7:
MEMORY_readmap[i] = PBI_D7GetByte;
MEMORY_writemap[i] = PBI_D7PutByte;
break;
case 0xff:
if (MEMORY_mosaic_enabled) MEMORY_writemap[0xff] = MosaicPutByte;
break;
case 0xcf:
if (MEMORY_axlon_enabled) MEMORY_writemap[0xcf] = AxlonPutByte;
break;
case 0x0f:
if (MEMORY_axlon_enabled && MEMORY_axlon_0f_mirror) MEMORY_writemap[0x0f] = AxlonPutByte;
break;
default:
/* something's wrong, so we keep current values */
break;
}
break;
default:
/* something's wrong, so we keep current values */
break;
}
}
}
#endif
if (Atari800_machine_type == Atari800_MACHINE_XLXE) {
if (SaveVerbose != 0)
StateSav_ReadUBYTE(&MEMORY_basic[0], 8192);
StateSav_ReadUBYTE(&under_atari_basic[0], 8192);
if (SaveVerbose != 0)
StateSav_ReadUBYTE(&MEMORY_os[0], 16384);
StateSav_ReadUBYTE(&under_atarixl_os[0], 16384);
}
ANTIC_xe_ptr = NULL;
AllocXEMemory();
if (MEMORY_ram_size > 64) {
StateSav_ReadUBYTE(&atarixe_memory[0], atarixe_memory_size);
/* a hack that makes state files compatible with previous versions:
for 130 XE there's written 192 KB of unused data */
if (MEMORY_ram_size == 128) {
UBYTE buffer[256];
int i;
for (i = 0; i < 192 * 4; i++)
StateSav_ReadUBYTE(&buffer[0], 256);
}
}
}
#endif /* BASIC */
void MEMORY_CopyFromMem(UWORD from, UBYTE *to, int size)
{
while (--size >= 0) {
*to++ = MEMORY_GetByte(from);
from++;
}
}
void MEMORY_CopyToMem(const UBYTE *from, UWORD to, int size)
{
while (--size >= 0) {
MEMORY_PutByte(to, *from);
from++;
to++;
}
}
/*
* Returns non-zero, if Atari BASIC is disabled by given PORTB output.
* Normally BASIC is disabled by setting bit 1, but it's also disabled
* when using 576K and 1088K memory expansions, where bit 1 is used
* for selecting extended memory bank number.
*/
static int basic_disabled(UBYTE portb)
{
return (portb & 0x02) != 0
|| ((portb & 0x10) == 0 && (MEMORY_ram_size == 576 || MEMORY_ram_size == 1088));
}
/* Note: this function is only for XL/XE! */
void MEMORY_HandlePORTB(UBYTE byte, UBYTE oldval)
{
/* Switch XE memory bank in 0x4000-0x7fff */
if (MEMORY_ram_size > 64) {
int bank = 0;
/* bank = 0 : base RAM */
/* bank = 1..64 : extended RAM */
if ((byte & 0x10) == 0)
switch (MEMORY_ram_size) {
case 128:
bank = ((byte & 0x0c) >> 2) + 1;
break;
case 192:
bank = (((byte & 0x0c) + ((byte & 0x40) >> 2)) >> 2) + 1;
break;
case MEMORY_RAM_320_RAMBO:
bank = (((byte & 0x0c) + ((byte & 0x60) >> 1)) >> 2) + 1;
break;
case MEMORY_RAM_320_COMPY_SHOP:
bank = (((byte & 0x0c) + ((byte & 0xc0) >> 2)) >> 2) + 1;
break;
case 576:
bank = (((byte & 0x0e) + ((byte & 0x60) >> 1)) >> 1) + 1;
break;
case 1088:
bank = (((byte & 0x0e) + ((byte & 0xe0) >> 1)) >> 1) + 1;
break;
}
/* Note: in Compy Shop bit 5 (ANTIC access) disables Self Test */
if (MEMORY_selftest_enabled && (bank != MEMORY_xe_bank || (MEMORY_ram_size == MEMORY_RAM_320_COMPY_SHOP && (byte & 0x20) == 0))) {
/* Disable Self Test ROM */
memcpy(MEMORY_mem + 0x5000, under_atarixl_os + 0x1000, 0x800);
MEMORY_SetRAM(0x5000, 0x57ff);
MEMORY_selftest_enabled = FALSE;
}
if (bank != MEMORY_xe_bank) {
memcpy(atarixe_memory + (MEMORY_xe_bank << 14), MEMORY_mem + 0x4000, 16384);
memcpy(MEMORY_mem + 0x4000, atarixe_memory + (bank << 14), 16384);
MEMORY_xe_bank = bank;
}
if (MEMORY_ram_size == 128 || MEMORY_ram_size == MEMORY_RAM_320_COMPY_SHOP)
switch (byte & 0x30) {
case 0x20: /* ANTIC: base, CPU: extended */
ANTIC_xe_ptr = atarixe_memory;
break;
case 0x10: /* ANTIC: extended, CPU: base */
if (MEMORY_ram_size == 128)
ANTIC_xe_ptr = atarixe_memory + ((((byte & 0x0c) >> 2) + 1) << 14);
else /* 320 Compy Shop */
ANTIC_xe_ptr = atarixe_memory + (((((byte & 0x0c) + ((byte & 0xc0) >> 2)) >> 2) + 1) << 14);
break;
default: /* ANTIC same as CPU */
ANTIC_xe_ptr = NULL;
break;
}
}
/* Enable/disable OS ROM in 0xc000-0xcfff and 0xd800-0xffff */
if ((oldval ^ byte) & 0x01) {
if (byte & 0x01) {
/* Enable OS ROM */
if (MEMORY_ram_size > 48) {
memcpy(under_atarixl_os, MEMORY_mem + 0xc000, 0x1000);
memcpy(under_atarixl_os + 0x1800, MEMORY_mem + 0xd800, 0x2800);
MEMORY_SetROM(0xc000, 0xcfff);
MEMORY_SetROM(0xd800, 0xffff);
}
memcpy(MEMORY_mem + 0xc000, MEMORY_os, 0x1000);
memcpy(MEMORY_mem + 0xd800, MEMORY_os + 0x1800, 0x2800);
ESC_PatchOS();
}
else {
/* Disable OS ROM */
if (MEMORY_ram_size > 48) {
memcpy(MEMORY_mem + 0xc000, under_atarixl_os, 0x1000);
memcpy(MEMORY_mem + 0xd800, under_atarixl_os + 0x1800, 0x2800);
MEMORY_SetRAM(0xc000, 0xcfff);
MEMORY_SetRAM(0xd800, 0xffff);
} else {
MEMORY_dFillMem(0xc000, 0xff, 0x1000);
MEMORY_dFillMem(0xd800, 0xff, 0x2800);
}
/* When OS ROM is disabled we also have to disable Self Test - Jindroush */
if (MEMORY_selftest_enabled) {
if (MEMORY_ram_size > 20) {
memcpy(MEMORY_mem + 0x5000, under_atarixl_os + 0x1000, 0x800);
MEMORY_SetRAM(0x5000, 0x57ff);
}
else
MEMORY_dFillMem(0x5000, 0xff, 0x800);
MEMORY_selftest_enabled = FALSE;
}
}
}
/* Enable/disable BASIC ROM in 0xa000-0xbfff */
if (!MEMORY_cartA0BF_enabled) {
/* BASIC is disabled if bit 1 set or accessing extended 576K or 1088K memory */
int now_disabled = basic_disabled(byte);
if (basic_disabled(oldval) != now_disabled) {
if (now_disabled) {
/* Disable BASIC ROM */
if (MEMORY_ram_size > 40) {
memcpy(MEMORY_mem + 0xa000, under_atari_basic, 0x2000);
MEMORY_SetRAM(0xa000, 0xbfff);
}
else
MEMORY_dFillMem(0xa000, 0xff, 0x2000);
}
else {
/* Enable BASIC ROM */
if (MEMORY_ram_size > 40) {
memcpy(under_atari_basic, MEMORY_mem + 0xa000, 0x2000);
MEMORY_SetROM(0xa000, 0xbfff);
}
memcpy(MEMORY_mem + 0xa000, MEMORY_basic, 0x2000);
}
}
}
/* Enable/disable Self Test ROM in 0x5000-0x57ff */
if (byte & 0x80) {
if (MEMORY_selftest_enabled) {
/* Disable Self Test ROM */
if (MEMORY_ram_size > 20) {
memcpy(MEMORY_mem + 0x5000, under_atarixl_os + 0x1000, 0x800);
MEMORY_SetRAM(0x5000, 0x57ff);
}
else
MEMORY_dFillMem(0x5000, 0xff, 0x800);
MEMORY_selftest_enabled = FALSE;
}
}
else {
/* We can enable Self Test only if the OS ROM is enabled */
/* and we're not accessing extended 320K Compy Shop or 1088K memory */
/* Note: in Compy Shop bit 5 (ANTIC access) disables Self Test */
if (!MEMORY_selftest_enabled && (byte & 0x01)
&& !((byte & 0x30) != 0x30 && MEMORY_ram_size == MEMORY_RAM_320_COMPY_SHOP)
&& !((byte & 0x10) == 0 && MEMORY_ram_size == 1088)) {
/* Enable Self Test ROM */
if (MEMORY_ram_size > 20) {
memcpy(under_atarixl_os + 0x1000, MEMORY_mem + 0x5000, 0x800);
MEMORY_SetROM(0x5000, 0x57ff);
}
memcpy(MEMORY_mem + 0x5000, MEMORY_os + 0x1000, 0x800);
MEMORY_selftest_enabled = TRUE;
}
}
}
/* Mosaic banking scheme: writing to 0xffc0+<n> selects ram bank <n>, if
* that is past the last available bank, selects rom. Banks are 4k,
* located at 0xc000-0xcfff. Tested: Rambrandt (drawing program), Topdos1.5.
* Reverse engineered from software that uses it. May be incorrect in some
* details. Unknown: were there mirrors of the bank addresses? Was the RAM
* enabled at coldstart? Did the Mosaic home-bank on reset?
* The Topdos 1.5 manual has some information.
*/
static void MosaicPutByte(UWORD addr, UBYTE byte)
{
int newbank;
if (addr < 0xffc0) return;
#ifdef DEBUG
Log_print("MosaicPutByte:%4X:%2X",addr,byte);
#endif
newbank = addr - 0xffc0;
if (newbank == mosaic_curbank || (newbank > MEMORY_mosaic_maxbank && mosaic_curbank > MEMORY_mosaic_maxbank)) return; /*same bank or rom -> rom*/
if (newbank > MEMORY_mosaic_maxbank && mosaic_curbank <= MEMORY_mosaic_maxbank) {
/*ram ->rom*/
memcpy(mosaic_ram + mosaic_curbank*0x1000, MEMORY_mem + 0xc000,0x1000);
MEMORY_dFillMem(0xc000, 0xff, 0x1000);
MEMORY_SetROM(0xc000, 0xcfff);
}
else if (newbank <= MEMORY_mosaic_maxbank && mosaic_curbank > MEMORY_mosaic_maxbank) {
/*rom->ram*/
memcpy(MEMORY_mem + 0xc000, mosaic_ram+newbank*0x1000,0x1000);
MEMORY_SetRAM(0xc000, 0xcfff);
}
else {
/*ram -> ram*/
memcpy(mosaic_ram + mosaic_curbank*0x1000, MEMORY_mem + 0xc000, 0x1000);
memcpy(MEMORY_mem + 0xc000, mosaic_ram + newbank*0x1000, 0x1000);
MEMORY_SetRAM(0xc000, 0xcfff);
}
mosaic_curbank = newbank;
}
static UBYTE MosaicGetByte(UWORD addr)
{
#ifdef DEBUG
Log_print("MosaicGetByte%4X",addr);
#endif
return MEMORY_mem[addr];
}
/* Axlon banking scheme: writing <n> to 0xcfc0-0xcfff selects a bank. The Axlon
* used 3 bits, giving 8 banks. Extended versions were constructed that
* used additional bits, for up to 256 banks. Banks were 16k, at 0x4000-0x7fff.
* The total ram was 32+16*numbanks k. The Axlon did homebank on reset,
* compatibles did not. The Axlon had a shadow address at 0x0fc0-0x0fff.
* A possible explaination for the shadow address is that it allowed the
* Axlon to work in any 800 slot due to a hardware limitation.
* The shadow address could cause compatibility problems. The compatibles
* did not implement that shadow address.
* Source: comp.sys.atari.8bit postings, Andreas Magenheimer's FAQ
*/
static void AxlonPutByte(UWORD addr, UBYTE byte)
{
int newbank;
/*Write-through to RAM if it is the page 0x0f shadow*/
if ((addr&0xff00) == 0x0f00) MEMORY_mem[addr] = byte;
if ((addr&0xff) < 0xc0) return; /*0xffc0-0xffff and 0x0fc0-0x0fff only*/
#ifdef DEBUG
Log_print("AxlonPutByte:%4X:%2X", addr, byte);
#endif
newbank = (byte&MEMORY_axlon_bankmask);
if (newbank == axlon_curbank) return;
memcpy(axlon_ram + axlon_curbank*0x4000, MEMORY_mem + 0x4000, 0x4000);
memcpy(MEMORY_mem + 0x4000, axlon_ram + newbank*0x4000, 0x4000);
axlon_curbank = newbank;
}
static UBYTE AxlonGetByte(UWORD addr)
{
#ifdef DEBUG
Log_print("AxlonGetByte%4X",addr);
#endif
return MEMORY_mem[addr];
}
static int cart809F_enabled = FALSE;
int MEMORY_cartA0BF_enabled = FALSE;
static UBYTE under_cart809F[8192];
static UBYTE under_cartA0BF[8192];
void MEMORY_Cart809fDisable(void)
{
if (cart809F_enabled) {
if (MEMORY_ram_size > 32) {
memcpy(MEMORY_mem + 0x8000, under_cart809F, 0x2000);
MEMORY_SetRAM(0x8000, 0x9fff);
}
else
MEMORY_dFillMem(0x8000, 0xff, 0x2000);
cart809F_enabled = FALSE;
}
}
void MEMORY_Cart809fEnable(void)
{
if (!cart809F_enabled) {
if (MEMORY_ram_size > 32) {
memcpy(under_cart809F, MEMORY_mem + 0x8000, 0x2000);
MEMORY_SetROM(0x8000, 0x9fff);
}
cart809F_enabled = TRUE;
}
}
void MEMORY_CartA0bfDisable(void)
{
if (MEMORY_cartA0BF_enabled) {
/* No BASIC if not XL/XE or bit 1 of PORTB set */
/* or accessing extended 576K or 1088K memory */
if ((Atari800_machine_type != Atari800_MACHINE_XLXE) || basic_disabled((UBYTE) (PIA_PORTB | PIA_PORTB_mask))) {
if (MEMORY_ram_size > 40) {
memcpy(MEMORY_mem + 0xa000, under_cartA0BF, 0x2000);
MEMORY_SetRAM(0xa000, 0xbfff);
}
else
MEMORY_dFillMem(0xa000, 0xff, 0x2000);
}
else
memcpy(MEMORY_mem + 0xa000, MEMORY_basic, 0x2000);
MEMORY_cartA0BF_enabled = FALSE;
if (Atari800_machine_type == Atari800_MACHINE_XLXE) {
GTIA_TRIG[3] = 0;
if (GTIA_GRACTL & 4)
GTIA_TRIG_latch[3] = 0;
}
}
}
void MEMORY_CartA0bfEnable(void)
{
if (!MEMORY_cartA0BF_enabled) {
/* No BASIC if not XL/XE or bit 1 of PORTB set */
/* or accessing extended 576K or 1088K memory */
if (MEMORY_ram_size > 40 && ((Atari800_machine_type != Atari800_MACHINE_XLXE) || (PIA_PORTB & 0x02)
|| ((PIA_PORTB & 0x10) == 0 && (MEMORY_ram_size == 576 || MEMORY_ram_size == 1088)))) {
/* Back-up 0xa000-0xbfff RAM */
memcpy(under_cartA0BF, MEMORY_mem + 0xa000, 0x2000);
MEMORY_SetROM(0xa000, 0xbfff);
}
MEMORY_cartA0BF_enabled = TRUE;
if (Atari800_machine_type == Atari800_MACHINE_XLXE)
GTIA_TRIG[3] = 1;
}
}
void MEMORY_GetCharset(UBYTE *cs)
{
const UBYTE *p;
switch (Atari800_machine_type) {
case Atari800_MACHINE_OSA:
case Atari800_MACHINE_OSB:
p = MEMORY_mem + 0xe000;
break;
case Atari800_MACHINE_XLXE:
p = MEMORY_os + 0x2000;
break;
case Atari800_MACHINE_5200:
p = MEMORY_mem + 0xf800;
break;
default:
/* shouldn't happen */
return;
}
/* copy font, but change screencode order to ATASCII order */
memcpy(cs, p + 0x200, 0x100); /* control chars */
memcpy(cs + 0x100, p, 0x200); /* !"#$..., uppercase letters */
memcpy(cs + 0x300, p + 0x300, 0x100); /* lowercase letters */
}
#ifndef PAGED_MEM
UBYTE MEMORY_HwGetByte(UWORD addr)
{
UBYTE byte = 0xff;
switch (addr & 0xff00) {
case 0x4f00:
case 0x8f00:
CARTRIDGE_BountyBob1(addr);
byte = 0;
break;
case 0x5f00:
case 0x9f00:
CARTRIDGE_BountyBob2(addr);
byte = 0;
break;
case 0xd000: /* GTIA */
case 0xc000: /* GTIA - 5200 */
case 0xc100: /* GTIA - 5200 */
case 0xc200: /* GTIA - 5200 */
case 0xc300: /* GTIA - 5200 */
case 0xc400: /* GTIA - 5200 */
case 0xc500: /* GTIA - 5200 */
case 0xc600: /* GTIA - 5200 */
case 0xc700: /* GTIA - 5200 */
case 0xc800: /* GTIA - 5200 */
case 0xc900: /* GTIA - 5200 */
case 0xca00: /* GTIA - 5200 */
case 0xcb00: /* GTIA - 5200 */
case 0xcc00: /* GTIA - 5200 */
case 0xcd00: /* GTIA - 5200 */
case 0xce00: /* GTIA - 5200 */
byte = GTIA_GetByte(addr);
break;
case 0xd200: /* POKEY */
case 0xe800: /* POKEY - 5200 */
case 0xe900: /* POKEY - 5200 */
case 0xea00: /* POKEY - 5200 */
case 0xeb00: /* POKEY - 5200 */
case 0xec00: /* POKEY - 5200 */
case 0xed00: /* POKEY - 5200 */
case 0xee00: /* POKEY - 5200 */
case 0xef00: /* POKEY - 5200 */
byte = POKEY_GetByte(addr);
break;
case 0xd300: /* PIA */
byte = PIA_GetByte(addr);
break;
case 0xd400: /* ANTIC */
byte = ANTIC_GetByte(addr);
break;
case 0xd500: /* bank-switching cartridges, RTIME-8 */
byte = CARTRIDGE_GetByte(addr);
break;
case 0xff00: /* Mosaic memory expansion for 400/800 */
byte = MosaicGetByte(addr);
break;
case 0xcf00: /* Axlon memory expansion for 800 */
case 0x0f00: /* Axlon shadow */
if (Atari800_machine_type == Atari800_MACHINE_5200) {
byte = GTIA_GetByte(addr); /* GTIA-5200 cfxx */
}
else {
byte = AxlonGetByte(addr);
}
break;
case 0xd100: /* PBI page D1 */
byte = PBI_D1GetByte(addr);
break;
case 0xd600: /* PBI page D6 */
byte = PBI_D6GetByte(addr);
break;
case 0xd700: /* PBI page D7 */
byte = PBI_D7GetByte(addr);
break;
default:
break;
}
return byte;
}
void MEMORY_HwPutByte(UWORD addr, UBYTE byte)
{
switch (addr & 0xff00) {
case 0x4f00:
case 0x8f00:
CARTRIDGE_BountyBob1(addr);
break;
case 0x5f00:
case 0x9f00:
CARTRIDGE_BountyBob2(addr);
break;
case 0xd000: /* GTIA */
case 0xc000: /* GTIA - 5200 */
case 0xc100: /* GTIA - 5200 */
case 0xc200: /* GTIA - 5200 */
case 0xc300: /* GTIA - 5200 */
case 0xc400: /* GTIA - 5200 */
case 0xc500: /* GTIA - 5200 */
case 0xc600: /* GTIA - 5200 */
case 0xc700: /* GTIA - 5200 */
case 0xc800: /* GTIA - 5200 */
case 0xc900: /* GTIA - 5200 */
case 0xca00: /* GTIA - 5200 */
case 0xcb00: /* GTIA - 5200 */
case 0xcc00: /* GTIA - 5200 */
case 0xcd00: /* GTIA - 5200 */
case 0xce00: /* GTIA - 5200 */
GTIA_PutByte(addr, byte);