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Changed TZX loading algoritm

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fabio.olimpieri 2013-05-03 20:24:52 +00:00
parent 53b90b5fcd
commit d020f6ec66
2 changed files with 64 additions and 60 deletions
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4
src/computer.h
View File

@ -32,8 +32,8 @@
extern char salir;
enum tapmodes {TAP_GUIDE, TAP_DATA, TAP_PAUSE, TAP_TRASH, TAP_STOP, TAP_PAUSE2, TZX_PURE_TONE,
TZX_SEQ_PULSES, TAP_FINAL_BIT, TAP_PAUSE3};
enum tapmodes {TAP_GUIDE, TAP_DATA, TAP_PAUSE, TAP_TRASH, TAP_STOP, TAP_STOP2, TAP_PAUSE2, TZX_PURE_TONE,
TZX_SEQ_PULSES, TAP_FINAL_BIT};
enum taptypes {TAP_TAP, TAP_TZX};
enum block_type {NOBLOCK, PROG, VAR, DATA};

120
src/tape.c
View File

@ -235,7 +235,7 @@ inline void tape_read_tzx (FILE * fichero, int tstados) {
case 0x10: // classic tape block
done = 1;
bucle = 0;
ordenador.tape_current_bit = 0;
//ordenador.tape_current_bit = 0;
ordenador.tape_bit0_level = 855;
ordenador.tape_bit1_level = 1710;
ordenador.tape_bits_at_end = 8;
@ -246,8 +246,8 @@ inline void tape_read_tzx (FILE * fichero, int tstados) {
retval=fread(&value2,1,1,fichero);
retval=fread(&value3,1,1,fichero); // pause length
ordenador.tape_pause_at_end = ((unsigned int) value2) + 256 * ((unsigned int) value3);
if(ordenador.tape_pause_at_end==0)
ordenador.tape_pause_at_end=10; // to avoid problems
//if(ordenador.tape_pause_at_end==0)
//ordenador.tape_pause_at_end=10; // to avoid problems
ordenador.tape_pause_at_end *= 3500;
retval=fread (&value, 1, 1, fichero);
retval=fread (&value2, 1, 1, fichero); // read block longitude
@ -264,11 +264,11 @@ inline void tape_read_tzx (FILE * fichero, int tstados) {
ordenador.tape_bit = 0x80;
ordenador.tape_current_mode = TAP_GUIDE;
ordenador.tape_counter0 = 2168;
ordenador.tape_counter1 = 2168;
ordenador.tape_counter1 = 0;
if (!(0x80 & ordenador.tape_byte))
ordenador.tape_counter_rep = 3228; // 4 seconds
ordenador.tape_counter_rep = 8063; // 4 seconds
else
ordenador.tape_counter_rep = 1614; // 2 seconds
ordenador.tape_counter_rep = 3223; // 2 seconds
break;
case 0x11: // turbo tape block
@ -293,7 +293,7 @@ inline void tape_read_tzx (FILE * fichero, int tstados) {
retval=fread(&value2,1,1,fichero);
retval=fread(&value3,1,1,fichero);
ordenador.tape_counter_rep = ((unsigned int) value2) + 256 * ((unsigned int) value3);
ordenador.tape_counter_rep /=2;
//ordenador.tape_counter_rep /=2;
retval=fread(&value2,1,1,fichero);
ordenador.tape_bits_at_end = value2;
@ -301,7 +301,6 @@ inline void tape_read_tzx (FILE * fichero, int tstados) {
retval=fread(&value3,1,1,fichero); // pause length
ordenador.tape_pause_at_end = ((unsigned int) value2) + 256 * ((unsigned int) value3);
//if(ordenador.tape_pause_at_end==0)
//ordenador.tape_pause_at_end=10; // to avoid problems
ordenador.tape_pause_at_end *= 3500;
@ -322,7 +321,7 @@ inline void tape_read_tzx (FILE * fichero, int tstados) {
ordenador.tape_bit = 0x80;
ordenador.tape_current_mode = TAP_GUIDE;
ordenador.tape_counter0 = ordenador.tape_block_level;
ordenador.tape_counter1 = ordenador.tape_block_level;
ordenador.tape_counter1 = 0;
//ordenador.tape_current_bit = 0;
break;
@ -403,16 +402,16 @@ inline void tape_read_tzx (FILE * fichero, int tstados) {
retval=fread(&value2,1,1,fichero);
retval=fread(&value3,1,1,fichero); // pause length
ordenador.tape_counter_rep = ((unsigned int) value2) + 256 * ((unsigned int) value3);
ordenador.tape_readed = 0;
//ordenador.tape_readed = 0;
ordenador.tape_counter0 = 0;
ordenador.tape_counter1 = 0; // 1ms of inversed pulse
ordenador.tape_counter1 = 0;
if(ordenador.tape_counter_rep == 0) {
ordenador.tape_current_mode = TAP_PAUSE2; // initialize
ordenador.tape_byte_counter = 31500;
ordenador.tape_current_mode = TAP_STOP2; // sTOP
//ordenador.tape_byte_counter = 31500;
break;
}
ordenador.tape_counter_rep *= 3500;
ordenador.tape_current_mode = TAP_PAUSE;
ordenador.tape_current_mode = TAP_PAUSE2;
break;
case 0x21: // group start
@ -458,16 +457,19 @@ inline void tape_read_tzx (FILE * fichero, int tstados) {
}
break;
case 0x2A: // pause if 48K
case 0x2A: // stop if 48K
for(bucle=0;bucle<4;bucle++)
retval=fread(&value,1,1,fichero);
if(ordenador.mode128k==0) {
ordenador.tape_stop = 1;
ordenador.tape_stop_fast = 1; // pause it
return;
}
ordenador.tape_counter0 = 0;
ordenador.tape_counter1 = 0;
ordenador.tape_counter_rep = 0;
ordenador.tape_current_mode = TAP_STOP2; // stop
//ordenador.tape_byte_counter = 31500;
done=1;
}
break;
case 0x30: // text description
retval=fread(&value2,1,1,fichero); // length
for(bucle=0;bucle<((unsigned int)value2);bucle++)
@ -529,11 +531,8 @@ inline void tape_read_tzx (FILE * fichero, int tstados) {
} while (!done);
}
if (feof (fichero)) {
rewind_tape(fichero,1);
ordenador.tape_current_bit = 0;
ordenador.tape_current_mode = TAP_TRASH;
return;
if (feof (fichero)&&(ordenador.tape_current_mode != TAP_STOP)) {
ordenador.tape_current_mode = TAP_STOP2;
}
// if there's a pulse still being reproduced, just play it
@ -544,20 +543,21 @@ inline void tape_read_tzx (FILE * fichero, int tstados) {
ordenador.tape_counter0 -= tstados; // decrement counter;
return;
} else {
ordenador.tape_current_bit=1-ordenador.tape_current_bit;
tstados -= ordenador.tape_counter0;
ordenador.tape_counter0 = 0;
}
}
ordenador.tape_readed = 1 - ordenador.tape_current_bit; // return oposite current
if (ordenador.tape_counter1) {
if (ordenador.tape_counter1 > tstados) {
ordenador.tape_readed = ordenador.tape_current_bit; // return oposite current
ordenador.tape_counter1 -= tstados; // decrement counter;
return;
} else {
tstados -= ordenador.tape_counter1;
ordenador.tape_counter1 = 0;
ordenador.tape_readed = ordenador.tape_current_bit; // return current
ordenador.tape_current_bit=1-ordenador.tape_current_bit;
}
}
@ -565,14 +565,17 @@ inline void tape_read_tzx (FILE * fichero, int tstados) {
switch (ordenador.tape_current_mode) {
case TAP_FINAL_BIT:
printf("TAP_FINAL_BIT\n");
ordenador.tape_current_mode = TAP_TRASH;
ordenador.next_block= NOBLOCK;
break;
case TAP_GUIDE: // guide tone
ordenador.tape_counter_rep--;
if (ordenador.tape_counter_rep) { // still into guide tone
ordenador.tape_counter_rep--;
ordenador.tape_counter0 = ordenador.tape_block_level - tstados;
ordenador.tape_counter1 = ordenador.tape_block_level; // new pulse
if (ordenador.tape_block_level>tstados) ordenador.tape_counter0 = ordenador.tape_block_level - tstados;
else ordenador.tape_counter0 = 0;
ordenador.tape_counter1 = 0;
return;
} else { // guide tone ended. send sync tone
ordenador.tape_counter0 = ordenador.tape_sync_level0 - tstados;
@ -585,9 +588,9 @@ inline void tape_read_tzx (FILE * fichero, int tstados) {
ordenador.tape_bit = ((ordenador.tape_bit>>1)&0x7F);
}
}
return;
}
break;
case TAP_DATA: // data
if (ordenador.tape_byte & ordenador.tape_bit) { // next bit is 1
ordenador.tape_counter0 = ordenador.tape_bit1_level - tstados;
@ -601,7 +604,7 @@ inline void tape_read_tzx (FILE * fichero, int tstados) {
ordenador.tape_byte_counter--;
if (!ordenador.tape_byte_counter) { // ended the block
if(ordenador.tape_pause_at_end) {
ordenador.tape_current_mode = TAP_PAUSE3; // pause
ordenador.tape_current_mode = TAP_PAUSE2; // pause
ordenador.tape_counter_rep = ordenador.tape_pause_at_end;
} else
ordenador.tape_current_mode = TAP_FINAL_BIT;
@ -612,7 +615,7 @@ inline void tape_read_tzx (FILE * fichero, int tstados) {
if (feof (fichero)) {
rewind_tape (fichero,0);
ordenador.tape_current_bit = 0;
ordenador.tape_current_mode = TAP_STOP; // stop tape
ordenador.tape_current_mode = TAP_STOP2; // stop tape
return;
}
if((ordenador.tape_byte_counter==1)&&(ordenador.tape_bits_at_end!=8)) { // last byte
@ -624,15 +627,23 @@ inline void tape_read_tzx (FILE * fichero, int tstados) {
}
break;
case TAP_PAUSE3: // one pulse of 1 ms for ending the bit
ordenador.tape_counter0 = 3500; // 1 ms
case TAP_STOP2: // one pulse of 1 ms for ending the bit
printf("TAP_STOP2\n");
ordenador.tape_counter0 = 3500-tstados; // 1 ms
ordenador.tape_counter1 = 0;
ordenador.tape_current_mode = TAP_STOP;
break;
case TAP_PAUSE2: // one pulse of 1 ms for ending the bit
printf("TAP_PAUSE2\n");
ordenador.tape_counter0 = 3500-tstados; // 1 ms
ordenador.tape_counter1 = 0;
ordenador.tape_current_mode = TAP_PAUSE;
break;
case TAP_PAUSE: // pause
//ordenador.tape_readed = 0;
//ordenador.tape_current_bit = 0;
ordenador.tape_readed = 0;
ordenador.tape_current_bit = 0;
if (ordenador.tape_counter_rep > tstados) {
ordenador.tape_counter_rep -= tstados;
} else {
@ -641,36 +652,26 @@ inline void tape_read_tzx (FILE * fichero, int tstados) {
ordenador.next_block= NOBLOCK;
}
break;
case TAP_PAUSE2: // pause and stop
//ordenador.tape_readed = 0;
//ordenador.tape_current_bit = 0;
if (ordenador.tape_counter_rep > tstados) {
ordenador.tape_counter_rep -= tstados;
} else {
ordenador.tape_counter_rep = 0;
ordenador.tape_current_mode = TAP_TRASH; // read new block
ordenador.next_block= NOBLOCK;
ordenador.tape_stop = 1;
ordenador.tape_stop_fast = 1; // pause it
}
break;
case TZX_PURE_TONE:
ordenador.tape_counter_rep--;
ordenador.tape_current_bit = 1 - ordenador.tape_current_bit; // invert current bit
if (ordenador.tape_counter_rep) { // still into guide tone
ordenador.tape_counter0 = ordenador.tape_block_level - tstados;
ordenador.tape_counter1 = 0; // new pulse
if (ordenador.tape_counter_rep) { // still into guide tone
if (ordenador.tape_block_level>tstados) ordenador.tape_counter0 = ordenador.tape_block_level - tstados;
else ordenador.tape_counter0 = 0;
ordenador.tape_counter1 = 0;
} else
ordenador.tape_current_mode = TAP_TRASH; // next ID
ordenador.next_block= NOBLOCK;
break;
case TZX_SEQ_PULSES:
ordenador.tape_current_bit = 1 - ordenador.tape_current_bit; // invert current bit
ordenador.tape_counter_rep--;
if(ordenador.tape_counter_rep) {
retval=fread(&value2,1,1,fichero);
retval=fread(&value3,1,1,fichero); // length of pulse in T-states
ordenador.tape_counter0 = ((unsigned int) value2) + 256 * ((unsigned int) value3);
ordenador.tape_block_level = ((unsigned int) value2) + 256 * ((unsigned int) value3);
if (ordenador.tape_block_level>tstados) ordenador.tape_counter0 = ordenador.tape_block_level - tstados;
else ordenador.tape_counter0 = 0;
ordenador.tape_counter1 = 0;
} else
ordenador.tape_current_mode = TAP_TRASH; // next ID
@ -678,7 +679,10 @@ inline void tape_read_tzx (FILE * fichero, int tstados) {
break;
case TAP_STOP:
printf("TAP_STOP\n");
ordenador.tape_current_bit = 0;
ordenador.tape_readed = 0;
ordenador.tape_counter_rep = 0;
ordenador.tape_current_mode = TAP_TRASH; // initialize
ordenador.next_block= NOBLOCK;
ordenador.tape_stop = 1; // pause it
@ -1264,9 +1268,9 @@ void fastload_block_tzx (FILE * fichero) {
//Anticipate auto ultra fast mode
if ((ordenador.turbo_state!= 1)&&(ordenador.turbo==1))
{
update_frequency(11000000);
update_frequency(10000000); //precision could be on
jump_frames=7;
ordenador.turbo_state=4;
//ordenador.turbo_state=4;
}
ordenador.tape_start_countdwn=((unsigned int)pause[0]+256*(unsigned int)pause[1])/20+1; //autoplay countdown
if (ordenador.tape_start_countdwn<10) ordenador.tape_start_countdwn=10; //in case the pause is too short