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bios.c
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/***************************************************************************/
/* */
/* hard BIOS support source file */
/* */
/* This file contain support for pc engine hudson cd bios without using */
/* the standard routines with ports but simulating directly the function. */
/* */
/* You're welcome to help coding this piece of software, it's really */
/* interesting to discover precise use of each function by hacking the */
/* cd system and such ^^ */
/***************************************************************************/
#undef INLINED_ACCESSORS
#include "h6280.h"
#include "globals.h"
#include "utils.h"
#include "pce.h"
/* CD related functions */
#define CD_BOOT 0x00
#define CD_RESET 0x01
#define CD_BASE 0x02
#define CD_READ 0x03
#define CD_SEEK 0x04
#define CD_EXEC 0x05
#define CD_PLAY 0x06
#define CD_SEARCH 0x07
#define CD_PAUSE 0x08
#define CD_STAT 0x09
#define CD_SUBA 0x0A
#define CD_DINFO 0x0B
#define CD_DINFO_NB_TRACKS 0
#define CD_DINFO_LENGTH 1
#define CD_DINFO_TRACK 2
#define CD_CONTENTS 0x0C
#define CD_SUBRQ 0x0D
#define CD_PCMRD 0x0E
#define CD_FADE 0x0F
/* ADPCM related functions */
#define AD_RESET 0x10
#define AD_TRANS 0x11
#define AD_READ 0x12
#define AD_WRITE 0x13
#define AD_PLAY 0x14
#define AD_CPLAY 0x15
#define AD_STOP 0x16
#define AD_STAT 0x17
/* BACKUP MEM related functions */
#define BM_FORMAT 0x18
#define BM_FREE 0x19
#define BM_READ 0x1A
#define BM_WRITE 0x1B
#define BM_DELETE 0x1C
#define BM_FILES 0x1D
/* Miscelanous functions */
#define EX_GETVER 0x1E
#define EX_SETVEC 0x1F
#define EX_GETFNT 0x20
#define EX_JOYSNS 0x21
#define EX_JOYREP 0x22
#define EX_SCRSIZ 0x23
#define EX_DOTMOD 0x24
#define EX_SCRMOD 0x25
#define EX_IMODE 0x26
#define EX_VMOD 0x27
#define EX_HMOD 0x28
#define EX_VSYNC 0x29
#define EX_RCRON 0x2A
#define EX_RCROFF 0x2B
#define EX_IRQON 0x2C
#define EX_IRQOFF 0x2D
#define EX_BGON 0x2E
#define EX_BGOFF 0x2F
#define EX_SPRON 0x30
#define EX_SPROFF 0x31
#define EX_DSPON 0x32
#define EX_DSPOFF 0x33
#define EX_DMAMOD 0x34
#define EX_SPRDMA 0x35
#define EX_SATCLR 0x36
#define EX_SPRPUT 0x37
#define EX_SETRCR 0x38
#define EX_SETRED 0x39
#define EX_SETWRT 0x3A
#define EX_SETDMA 0x3B
#define EX_BINBCD 0x3C
#define EX_BCDBIN 0x3D
#define EX_RND 0x3E
/* Math related functions */
#define MA_MUL8U 0x3F
#define MA_MUL8S 0x40
#define MA_MUL16U 0x41
#define MA_DIV16U 0x42
#define MA_DIV16S 0x43
#define MA_SQRT 0x44
#define MA_SIN 0x45
#define MA_COS 0x46
#define MA_ATNI 0x47
/* PSG BIOS functions */
#define PSG_BIOS 0x48
#define GRP_BIOS 0x49
#define KEY_BIOS 0x4A
#define PSG_DRIVE 0x4B
#define EX_COLORC 0x4C
#define MA_MUL16S 0x4F
#define MA_CBASIS 0x50
#define _al 0xF8
#define _ah 0xF9
#define _bl 0xFA
#define _bh 0xFB
#define _cl 0xFC
#define _ch 0xFD
#define _dl 0xFE
#define _dh 0xFF
#define _ax 0xF8
#define _bx 0xFA
#define _cx 0xFC
#define _dx 0xFE
int testadpcm = 0;
#ifdef CD_DEBUG
const char *cdbios_functions(int index)
{
switch(index) {
case CD_BOOT:
return "CD_BOOT";
case CD_RESET:
return "CD_RESET";
case CD_BASE:
return "CD_BASE";
case CD_READ:
return "CD_READ";
case CD_SEEK:
return "CD_SEEK";
case CD_EXEC:
return "CD_EXEC";
case CD_PLAY:
return "CD_PLAY";
case CD_SEARCH:
return "CD_SEARCH";
case CD_PAUSE:
return "CD_PAUSE";
case CD_STAT:
return "CD_STAT";
case CD_SUBA:
return "CD_SUBA";
case CD_DINFO:
return "CD_DINFO";
case CD_CONTENTS:
return "CD_CONTENTS";
case CD_SUBRQ:
return "CD_SUBRQ";
case CD_PCMRD:
return "CD_PCMRD";
case CD_FADE:
return "CD_FADE";
case AD_RESET:
return "AD_RESET";
case AD_TRANS:
return "AD_TRANS";
case AD_READ:
return "AD_READ";
case AD_WRITE:
return "AD_WRITE";
case AD_PLAY:
return "AD_PLAY";
case AD_CPLAY:
return "AD_CPLAY";
case AD_STOP:
return "AD_STOP";
case AD_STAT:
return "AD_STAT";
case BM_FORMAT:
return "BM_FORMAT";
case BM_FREE:
return "BM_FREE";
case BM_READ:
return "BM_READ";
case BM_WRITE:
return "BM_WRITE";
case BM_DELETE:
return "BM_DELETE";
case BM_FILES:
return "BM_FILES";
case EX_GETVER:
return "EX_GETVER";
case EX_SETVEC:
return "EX_SETVEC";
case EX_GETFNT:
return "EX_GETFNT";
case EX_JOYSNS:
return "EX_JOYSNS";
case EX_JOYREP:
return "EX_JOYREP";
case EX_SCRSIZ:
return "EX_SCRSIZ";
case EX_DOTMOD:
return "EX_DOTMOD";
case EX_SCRMOD:
return "EX_SCRMOD";
case EX_IMODE:
return "EX_IMODE";
case EX_VMOD:
return "EX_VMOD";
case EX_HMOD:
return "EX_HMOD";
case EX_VSYNC:
return "EX_VSYNC";
case EX_RCRON:
return "EX_RCRON";
case EX_RCROFF:
return "EX_RCROFF";
case EX_IRQON:
return "EX_IRQON";
case EX_IRQOFF:
return "EX_IRQOFF";
case EX_BGON:
return "EX_BGON";
case EX_BGOFF:
return "EX_BGOFF";
case EX_SPRON:
return "EX_SPRON";
case EX_SPROFF:
return "EX_SPROFF";
case EX_DSPON:
return "EX_DSPON";
case EX_DSPOFF:
return "EX_DSPOFF";
case EX_DMAMOD:
return "EX_DMAMOD";
case EX_SPRDMA:
return "EX_SPRDMA";
case EX_SATCLR:
return "EX_SATCLR";
case EX_SPRPUT:
return "EX_SPRPUT";
case EX_SETRCR:
return "EX_SETRCR";
case EX_SETRED:
return "EX_SETRED";
case EX_SETWRT:
return "EX_SETWRT";
case EX_SETDMA:
return "EX_SETDMA";
case EX_BINBCD:
return "EX_BINBCD";
case EX_BCDBIN:
return "EX_BCDBIN";
case EX_RND:
return "EX_RND";
case MA_MUL8U:
return "MA_MUL8U";
case MA_MUL8S:
return "MA_MUL8S";
case MA_MUL16U:
return "MA_MUL16U";
case MA_DIV16S:
return "MA_DIV16S";
case MA_DIV16U:
return "MA_DIV16U";
case MA_SQRT:
return "MA_SQRT";
case MA_SIN:
return "MA_SIN";
case MA_COS:
return "MA_COS";
case MA_ATNI:
return "MA_ATNI";
case PSG_BIOS:
return "PSG_BIOS";
case GRP_BIOS:
return "GRP_BIOS";
case KEY_BIOS:
return "KEY_BIOS";
case PSG_DRIVE:
return "PSG_DRIVE";
case EX_COLORC:
return "EX_COLORC";
default:
break;
}
return "?UNKNOWN?";
}
#endif
void handle_bios(void)
{
#ifdef CD_DEBUG
static int last_op = -1, last_ax = -1, last_bx = -1, last_cx = -1, last_dx = -1;
int this_op = imm_operand_e(reg_pc + 1), this_ax = get_16bit_zp_e(_ax), this_bx = get_16bit_zp_e(_bx),
this_cx = get_16bit_zp_e(_cx), this_dx = get_16bit_zp_e(_dx);
/*
* Skip over polling functions to avoid the spam
*/
if ((this_op != CD_PCMRD) && (this_op != CD_SUBA) && (this_op != EX_JOYSNS) && (this_op != AD_STAT)) {
if ((last_op != this_op) || (last_ax != this_ax) || (last_bx != this_bx) || (last_cx != this_cx) ||
(last_dx != this_dx)) {
fprintf(stderr, "\n%s: ax=%d ah=%d al=%d bx=%d bh=%d bl=%d\ncx=%d ch=%d cl=%d dx=%d dh=%d dl=%d",
cdbios_functions(imm_operand_e(reg_pc + 1)), get_16bit_zp_e(_ax), get_8bit_zp_e(_ah), get_8bit_zp_e(_al),
get_16bit_zp_e(_bx), get_8bit_zp_e(_bh), get_8bit_zp_e(_bl),
get_16bit_zp_e(_cx), get_8bit_zp_e(_ch), get_8bit_zp_e(_cl),
get_16bit_zp_e(_dx), get_8bit_zp_e(_dh), get_8bit_zp_e(_dl));
last_op = this_op;
last_ax = this_ax;
last_bx = this_bx;
last_cx = this_cx;
last_dx = this_dx;
} else {
fprintf(stderr, ".");
}
}
#endif
switch(imm_operand_e((UInt16)(reg_pc + 1))) {
case CD_RESET:
switch(CD_emulation) {
case 1: /* true CD */
if (osd_cd_init(ISO_filename) != 0) {
Log("CD rom drive init error!\n");
exit(4);
}
break;
case 2: /* ISO */
case 3: /* ISQ */
case 4: /* BIN */
fill_cd_info();
break;
/* HCD : nothing to be done */
}
put_8bit_addr_e(0x222D, 1);
// This byte is set to 1 if a disc if present
rts();
break;
case CD_READ:
{
UChar mode = get_8bit_zp_e(_dh);
UInt32 nb_to_read = get_8bit_zp_e(_al);
UInt16 offset = get_16bit_zp_e(_bx);
pce_cd_sectoraddy = (get_8bit_zp_e(_cl) << 16) +
(get_8bit_zp_e(_ch) << 8) +
(get_8bit_zp_e(_dl));
pce_cd_sectoraddy += (get_8bit_addr_e(0x2274 + 3 * get_8bit_addr_e(0x2273)) << 16) +
(get_8bit_addr_e(0x2275 + 3 * get_8bit_addr_e(0x2273)) << 8) +
(get_8bit_addr_e(0x2276 + 3 * get_8bit_addr_e(0x2273)));
switch(mode) {
case 0: // local, size in byte
nb_to_read = get_16bit_zp_e(_ax);
while (nb_to_read >= 2048) {
int index;
pce_cd_read_sector();
for (index = 0;index < 2048; index++)
put_8bit_addr_e(offset++, cd_read_buffer[index]);
nb_to_read -= 2048;
}
if (nb_to_read) {
UInt32 index;
pce_cd_read_sector();
for (index = 0; index < nb_to_read; index++)
put_8bit_addr_e(offset++, cd_read_buffer[index]);
}
reg_p = ((reg_p & (~(FL_N|FL_T|FL_Z))) | flnz_list[reg_a = 0]);
cd_sectorcnt = 0;
cd_read_buffer = NULL;
pce_cd_read_datacnt = 0;
rts();
break;
case 1: // local, size in sector
while (nb_to_read) {
int index;
pce_cd_read_sector();
for (index = 0; index < 2048; index++)
put_8bit_addr_e(offset++, cd_read_buffer[index]);
nb_to_read--;
}
reg_p = ((reg_p & (~(FL_N|FL_T|FL_Z))) | flnz_list[reg_a = 0]);
// TEST
io.cd_port_1800 |= 0xD0;
// TEST
cd_sectorcnt = 0;
cd_read_buffer = NULL;
pce_cd_read_datacnt = 0;
rts();
break;
case 2:
case 3:
case 4:
case 5:
case 6:
{
UChar nb_bank_to_fill_completely = nb_to_read >> 2;
UChar remaining_block_to_write = nb_to_read & 3;
UChar bank_where_to_write = get_8bit_zp_e(_bl);
UInt16 offset_in_bank = 0;
while (nb_bank_to_fill_completely--) {
pce_cd_read_sector();
memcpy(ROMMapW[bank_where_to_write], cd_read_buffer, 2048);
pce_cd_read_sector();
memcpy(ROMMapW[bank_where_to_write] + 2048, cd_read_buffer, 2048);
pce_cd_read_sector();
memcpy(ROMMapW[bank_where_to_write] + 2048 * 2, cd_read_buffer, 2048);
pce_cd_read_sector();
memcpy(ROMMapW[bank_where_to_write] + 2048 * 3, cd_read_buffer, 2048);
bank_where_to_write++;
}
offset_in_bank = 0;
while (remaining_block_to_write--) {
pce_cd_read_sector();
#ifndef FINAL_RELEASE
fprintf(stderr, "Writing quarter to ROMMap[0x%x] + 0x%x\n\n",
bank_where_to_write,offset_in_bank);
#endif
memcpy(ROMMapW[bank_where_to_write] + offset_in_bank, cd_read_buffer, 2048);
offset_in_bank += 2048;
}
}
cd_sectorcnt = 0;
cd_read_buffer = NULL;
pce_cd_read_datacnt = 0;
reg_p = ((reg_p & (~(FL_N|FL_T|FL_Z))) | flnz_list[reg_a = 0]);
rts();
break;
case 0xFE:
IO_write(0, 0);
IO_write(2, (UChar)(offset & 0xFF));
IO_write(3, (UChar)(offset >> 8));
IO_write(0, 2);
{
UInt32 nb_sector;
nb_to_read = get_16bit_zp_e(_ax);
nb_sector = (nb_to_read >> 11) + ((nb_to_read & 2047) ? 1 : 0);
while (nb_sector) {
int x, index = min(2048, (int)nb_to_read);
pce_cd_read_sector();
//memcpy(&VRAM[offset],cd_read_buffer,index);
for (x = 0; x < index; x += 2) {
IO_write(2, cd_read_buffer[x]);
IO_write(3, cd_read_buffer[x + 1]);
}
nb_to_read-=index;
nb_sector--;
}
cd_sectorcnt = 0;
cd_read_buffer = NULL;
pce_cd_read_datacnt = 0;
reg_p = ((reg_p & (~(FL_N|FL_T|FL_Z))) | flnz_list[reg_a = 0]);
rts();
// break;
}
break;
case 0xFF:
if (!nb_to_read)
reg_p = ((reg_p & (~(FL_N|FL_T|FL_Z))) | flnz_list[reg_a = 0x22]);
else {
IO_write(0, 0);
IO_write(2, (UChar)(offset & 0xFF));
IO_write(3, (UChar)(offset >> 8));
IO_write(0, 2);
while (nb_to_read) {
int index;
pce_cd_read_sector();
for (index = 0; index < 2048; index += 2) {
IO_write(2, cd_read_buffer[index]);
IO_write(3, cd_read_buffer[index + 1]);
}
nb_to_read--;
}
cd_sectorcnt = 0;
cd_read_buffer = NULL;
pce_cd_read_datacnt = 0;
reg_p = ((reg_p & (~(FL_N|FL_T|FL_Z))) | flnz_list[reg_a = 0]);
}
rts();
break;
default :
/* the reading mode isn't supported and we simulate the
* behaviour of the 2 first byte opcode and keep going
* thus hooking further calls to this function
*/
put_8bit_addr_e(0x2273, 0);
reg_pc += 2;
#ifdef CD_DEBUG
fprintf(stderr, "Reading mode not supported : %d\n_AX=0x%04x\n_BX=0x%04x\n_CX=0x%04x\n_DX=0x%04x\n",
mode, get_16bit_zp_e(_ax), get_16bit_zp_e(_bx), get_16bit_zp_e(_cx), get_16bit_zp_e(_dx));
#endif
}
}
break;
case CD_PAUSE:
switch(CD_emulation) {
case 1:
osd_cd_pause();
break;
case 2:
case 3:
case 4:
break;
case 5:
HCD_pause_playing();
break;
}
reg_p = ((reg_p & (~(FL_N|FL_T|FL_Z))) | flnz_list[reg_a = 0]);
rts();
break;
case CD_STAT:
{
/* TODO : makes this function work for cd and hcd at least
* gives info on the status of playing music
*/
int retval;
osd_cd_status(&retval);
reg_p = ((reg_p & (~(FL_N | FL_T | FL_Z))) | flnz_list[reg_a = 0]);
}
rts();
break;
case CD_SUBA:
/* TODO : check the real functionality of this function
* seems to fill a whole buffer of 10 bytes but
* meaning of this array is mostly unknown
*/
{
UInt16 offset = get_16bit_zp_e(_bx);
// static UChar result = 3;
// result = 3 - result;
// Wr6502(offset, result); // TEST, for golden axe (3) and solid force (0)
osd_cd_subchannel_info(offset);
}
reg_p = ((reg_p & (~(FL_N|FL_T|FL_Z))) | flnz_list[reg_a = 0]);
rts();
break;
case CD_PCMRD:
// do almost nothing
// fake the audio player, maybe not other piece of code
reg_p = ((reg_p & (~(FL_N|FL_T|FL_Z))) | flnz_list[reg_a = get_8bit_zp_e(0x41)]);
rts();
break;
case CD_SEARCH:
/* unsure how this operates
* needed for playing audio discs with a system card
*
* _al contains the track we're "searching" for.
* If I'm not mistaken _bh is a flag with that 7th bit (128) set
* for SEEK_SET type behaviour, while if the 2nd bit (2) is set
* we play the track after searching for it.
*/
{
// if (get_8bit_zp_e(_bh) & 0x02) {
// osd_cd_play_audio_track(bcdbin[get_8bit_zp_e(_al)]);
// } else {
/* UInt16 bufaddr = get_16bit_zp_e(_bx); */
int min, sec, fra, con;
osd_cd_stop_audio();
osd_cd_track_info(bcdbin[get_8bit_zp_e(_al)], &min, &sec, &fra, &con);
/*
put_8bit_addr_e(bufaddr, min);
put_8bit_addr_e(bufaddr + 1, sec);
put_8bit_addr_e(bufaddr + 2, fra);
put_8bit_addr_e(bufaddr + 3, con);
*/
if (get_8bit_zp_e(_bh) & 0x02)
osd_cd_play_audio_track(bcdbin[get_8bit_zp_e(_al)]);
// else
// osd_cd_stop_audio();
}
reg_p = ((reg_p & (~(FL_N | FL_T | FL_Z))) | flnz_list[reg_a = 0]);
rts();
break;
case AD_RESET:
// do nothing
// don't return any value
// reg_p = ((reg_p & (~(FL_N | FL_T | FL_Z))) | flnz_list[reg_a = 0]);
rts();
break;
case AD_TRANS:
{
UInt32 nb_to_read = get_8bit_zp_e(_al);
UInt16 ADPCM_offset = get_16bit_zp_e(_bx);
pce_cd_sectoraddy = (get_8bit_zp_e(_cl) << 16) +
(get_8bit_zp_e(_ch) << 8) +
(get_8bit_zp_e(_dl));
pce_cd_sectoraddy += (get_8bit_addr_e(0x2274 + 3 * get_8bit_addr_e(0x2273)) << 16) +
(get_8bit_addr_e(0x2275 + 3 * get_8bit_addr_e(0x2273)) << 8) +
(get_8bit_addr_e(0x2276 + 3 * get_8bit_addr_e(0x2273)));
if (!get_8bit_zp_e(_dh))
io.adpcm_dmaptr = ADPCM_offset;
else
ADPCM_offset = io.adpcm_dmaptr;
while (nb_to_read) {
pce_cd_read_sector();
memcpy(PCM + ADPCM_offset, cd_read_buffer, 2048);
ADPCM_offset += 2048;
nb_to_read--;
}
io.adpcm_dmaptr = ADPCM_offset;
reg_p = ((reg_p & (~(FL_N|FL_T|FL_Z))) | flnz_list[reg_a = 0]);
}
rts();
break;
case AD_READ:
{
UInt16 ADPCM_buffer = get_16bit_zp_e(_cx);
UChar type = get_8bit_zp_e(_dh);
UInt16 address = get_16bit_zp_e(_bx);
UInt16 size = get_16bit_zp_e(_ax);
switch(type) {
case 0: // memory write
io.adpcm_rptr = ADPCM_buffer;
while (size) {
put_8bit_addr_e(address++, PCM[io.adpcm_rptr++]);
size--;
}
break;
case 0xFF: // VRAM write
io.adpcm_rptr = ADPCM_buffer;
IO_write(0, 0);
IO_write(2, (UChar)(address & 0xFF));
IO_write(3, (UChar)(address >> 8));
IO_write(0, 2);
while (size) {
IO_write(2, PCM[io.adpcm_rptr++]);
size--;
if (size) {
IO_write(3, PCM[io.adpcm_rptr++]);
size--;
}
}
break;
case 2:
case 3:
case 4:
case 5:
case 6:
{
UChar bank_to_fill = get_8bit_zp_e(_bl);
UInt32 i;
while (size >= 2048) {
for (i = 0; i < 2048; i++)
ROMMapW[bank_to_fill][i] = PCM[io.adpcm_rptr++];
bank_to_fill++;
size -= 2048;
}
for (i = 0; i < size; i++)
ROMMapW[bank_to_fill][i] = PCM[io.adpcm_rptr++];
}
break;
default:
Log("Type reading not supported in AD_READ : %x\n", type);
exit(-2);
}
reg_p = ((reg_p & (~(FL_N|FL_T|FL_Z))) | flnz_list[reg_a = 0]);
rts();
}
break;
case AD_PLAY:
io.adpcm_pptr = get_16bit_zp_e(_bx) << 1;
io.adpcm_psize = get_16bit_zp_e(_ax) << 1;
io.adpcm_rate = (UChar)(32 / (16 - (get_8bit_zp_e(_dh) & 15)));
new_adpcm_play = 1;
reg_p = ((reg_p & (~(FL_N|FL_T|FL_Z))) | flnz_list[reg_a = 0]);
rts();
break;
case AD_STOP:
AdpcmFilledBuf = new_adpcm_play = 0;
rts();
break;
case AD_STAT:
{
if (AdpcmFilledBuf > (io.adpcm_psize / 2))
reg_x = 4;
else if (AdpcmFilledBuf == 0)
reg_x = 1;
else
reg_x = 0;
reg_p = ((reg_p & (~(FL_N|FL_T|FL_Z))) | flnz_list[reg_a = (UChar)(reg_x == 1 ? 0 : 1)]);
}
rts();
break;
case CD_DINFO:
switch(get_8bit_zp_e(_al)) {
case CD_DINFO_TRACK:
{
UInt16 buf_offset = get_16bit_zp_e(_bx);
// usually 0x2256 in system 3.0
// _ah contain the number of the track
switch(CD_emulation) {
case 2:
case 3:
case 4:
case 5:
put_8bit_addr_e( (UInt16)buf_offset, CD_track[bcdbin[get_8bit_zp_e(_ah)]].beg_min);
put_8bit_addr_e( (UInt16)(buf_offset + 1), CD_track[bcdbin[get_8bit_zp_e(_ah)]].beg_sec);
put_8bit_addr_e( (UInt16)(buf_offset + 2), CD_track[bcdbin[get_8bit_zp_e(_ah)]].beg_fra);
put_8bit_addr_e( (UInt16)(buf_offset + 3), CD_track[bcdbin[get_8bit_zp_e(_ah)]].type);
break;
case 1:
{
int Min, Sec, Fra, Ctrl;
osd_cd_track_info(bcdbin[get_8bit_zp_e(_ah)], &Min, &Sec, &Fra, &Ctrl);
put_8bit_addr_e( (UInt16)(buf_offset), binbcd[Min]);
put_8bit_addr_e( (UInt16)(buf_offset + 1), binbcd[Sec]);
put_8bit_addr_e( (UInt16)(buf_offset + 2), binbcd[Fra]);
put_8bit_addr_e( (UInt16)(buf_offset + 3), (UChar)Ctrl);
}
break;
}
reg_p = ((reg_p & (~(FL_N|FL_T|FL_Z))) | flnz_list[reg_a = 0]);
}
rts();
break;
case CD_DINFO_NB_TRACKS:
{
UInt16 buf_offset = get_16bit_zp_e(_bx);
switch(CD_emulation) {
case 2:
case 3:
case 4:
put_8bit_addr_e( (UInt16)(buf_offset), binbcd[01]); // Number of first track (BCD)
put_8bit_addr_e( (UInt16)(buf_offset + 1), binbcd[nb_max_track]); // Number of last track (BCD)
break;
case 1:
{
int first_track, last_track;
osd_cd_nb_tracks(&first_track, &last_track);
put_8bit_addr_e( (UInt16)(buf_offset), binbcd[first_track]);
put_8bit_addr_e( (UInt16)(buf_offset + 1), binbcd[last_track]);
}
break;
case 5:
put_8bit_addr_e( (UInt16)(buf_offset), binbcd[HCD_first_track]);
put_8bit_addr_e( (UInt16)(buf_offset + 1), binbcd[HCD_last_track]);
break;
}
}
reg_p = ((reg_p & (~(FL_N|FL_T|FL_Z))) | flnz_list[reg_a = 0]);
rts();
break;
case CD_DINFO_LENGTH:
{
UInt16 buf_offset = get_16bit_zp_e(_bx);
int min, sec, frame;
osd_cd_length(&min, &sec, &frame);
put_8bit_addr_e( (UInt16)(buf_offset), binbcd[min]);
put_8bit_addr_e( (UInt16)(buf_offset + 1), binbcd[sec]);
put_8bit_addr_e( (UInt16)(buf_offset + 2), binbcd[frame]);
reg_p = ((reg_p & (~(FL_N|FL_T|FL_Z))) | flnz_list[reg_a = 0]);
}
rts();
break;
default:
Log("bios.c: Sub function 0X%02X from CD_DINFO not handled\n", get_8bit_zp_e(_al));
reg_p = ((reg_p & (~(FL_N|FL_T|FL_Z))) | flnz_list[reg_a = 1]);
rts();
break;
}
break;
case CD_PLAY:
if (get_8bit_zp_e(_bh) == 0x80) {
int status;
// playing a whole track
switch(CD_emulation) {
case 1:
osd_cd_status(&status);
if (status == CDROM_AUDIO_PAUSED)
osd_cd_resume();
else if (status == CDROM_AUDIO_PLAY)
osd_cd_stop_audio();
osd_cd_play_audio_track(bcdbin[get_8bit_zp_e(_al)]);
break;
case 2:
case 3:
case 4:
// ignoring cd playing
break;
case 5:
HCD_play_track(bcdbin[get_8bit_zp_e(_al)], (char)(get_8bit_zp_e(_dh) & 1) );
break;
}
} else if (get_8bit_zp_e(_bh) == 192) { /* resume from pause if paused */
int status;
osd_cd_status(&status);
if (status == CDROM_AUDIO_PAUSED)
osd_cd_resume();
else
osd_cd_play_audio_track(bcdbin[get_8bit_zp_e(_al)]);
} else {
int status;
int min1 = bcdbin[get_8bit_zp_e(_al)];
int sec1 = bcdbin[get_8bit_zp_e(_ah)];
int fra1 = bcdbin[get_8bit_zp_e(_bl)];
int min2 = bcdbin[get_8bit_zp_e(_cl)];
int sec2 = bcdbin[get_8bit_zp_e(_ch)];
int fra2 = bcdbin[get_8bit_zp_e(_dl)];
switch(CD_emulation) {
case 1:
osd_cd_status(&status);
if ((status == CDROM_AUDIO_PLAY) || (status == CDROM_AUDIO_PAUSED))
osd_cd_stop_audio();
osd_cd_play_audio_range((UChar)min1, (UChar)sec1, (UChar)fra1, (UChar)min2, (UChar)sec2, (UChar)fra2);
break;
case 2:
case 3:
case 4:
// ignoring cd playing
break;
case 5:
// HCD_play_sectors(begin_sect, sect_len, get_8bit_zp_e(_dh) & 1);
break;
}
}
reg_p = ((reg_p & (~(FL_N|FL_T|FL_Z))) | flnz_list[reg_a = 0]);
rts();
break;
case EX_JOYSNS:
{
UChar dummy[5], index;
for (index = 0; index < 5; index++) {
dummy[index] = get_8bit_addr_e(0x2228 + index);
put_8bit_addr_e( (UInt16)(0x2232 + index), dummy[index]);
put_8bit_addr_e( (UInt16)(0x2228 + index), io.JOY[index]);
put_8bit_addr_e( (UInt16)(0x222D + index), (io.JOY[index] ^ dummy[index]) & io.JOY[index]);
}
}
/* TODO : check if A <- 0 is needed here */
rts();
break;
case BM_FREE:
{
SInt16 free_mem;
free_mem = (SInt16)(WRAM[4] + (WRAM[5] << 8));
free_mem -= WRAM[6] + (WRAM[7] << 8);
free_mem -= 0x12; /* maybe the header */
if (free_mem < 0)
free_mem = 0;
put_8bit_zp_e(_cl, (UChar)(free_mem & 0xFF));
put_8bit_zp_e(_ch, (UChar)(free_mem >> 8));
reg_p = ((reg_p & (~(FL_N|FL_T|FL_Z))) | flnz_list[reg_a = 0]);
rts();
break;
}
#ifdef CD_DEBUG
case MA_MUL8U:
{
UInt16 res;
res = get_8bit_zp_e(_ax) * get_8bit_zp_e(_bx);
put_8bit_zp_e(_cl, res & 0xFF);