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nec.c
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nec.c
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/*
* BIN to .cas program file (NEC PC computers)
*
* Original code name: hex2cas,(c) 2003-2007
* by Takahide Matsutsuka.
*
* MC loader by Stefano Bodrato, (c) 2013
*
* $Id: nec.c,v 1.9 2016-06-26 00:46:55 aralbrec Exp $
*/
#include "appmake.h"
static char* binname = NULL;
static char* crtfile = NULL;
static char* outfile = NULL;
static int origin = -1;
static int mode = -1;
static char help = 0;
static char audio = 0;
char nec_fast = 0;
char nec_22 = 0;
//static char dumb = 0;
/* Options that are available for this module */
option_t nec_options[] = {
{ 'h', "help", "Display this help", OPT_BOOL, &help },
{ 'b', "binfile", "Linked binary file", OPT_STR, &binname },
{ 'c', "crt0file", "crt0 file used in linking", OPT_STR, &crtfile },
{ 'o', "output", "Name of output file", OPT_STR, &outfile },
{ 0, "audio", "Create also a WAV file", OPT_BOOL, &audio },
{ 0, "fast", "Create a fast loading WAV", OPT_BOOL, &nec_fast },
{ 0, "22", "22050hz bitrate option", OPT_BOOL, &nec_22 },
// { 0, "dumb", "Just convert to WAV a tape file", OPT_BOOL, &dumb },
{ 0, "org", "Origin of the binary", OPT_INT, &origin },
{ 0, "mode", "0..5: 16k,32k,mk2,n,ROM,n88", OPT_INT, &mode },
{ 0, NULL, NULL, OPT_NONE, NULL }
};
/* modes */
enum {
MODE1,
MODE2,
MODE5,
MODEN,
MODEROM,
MODEN88,
MODE_QUIT
};
/* A default architecture-depend file name. */
#define DEFAULT_ARCH_FILENAME "noname"
/* Definitions of code segment for each mode. */
//#define MODE1_ADDRESS_CODESEG 0xc40f
//#define MODE2_ADDRESS_CODESEG 0x840f
//#define MODE5_ADDRESS_CODESEG 0x800f
#define MODE1_ADDRESS_CODESEG 0xc437
#define MODE2_ADDRESS_CODESEG 0x8437
#define MODE5_ADDRESS_CODESEG 0x8037
#define MODEN88_ADDRESS_CODESEG 0x0100
#define MODEROM_ADDRESS_CODESEG 0x4004
/* It is a sort of a fast mode KansasCity format, */
/* very close to the SC-3000 */
/* four fast cycles for '1', two slow cycles for '0' */
/* but the samples I've seen seem to have also an aplitude */
/* variation, so here it is ! */
extern void nec_bit(FILE* fpout, unsigned char bit)
{
int i, period0, period1;
if (nec_fast) {
period1 = 8;
period0 = 14;
} else {
period1 = 9;
period0 = 21;
}
if (bit) {
/* '1' */
for (i = 0; i < period1; i++)
fputc(0x30, fpout);
for (i = 0; i < period1; i++)
fputc(0xd0, fpout);
for (i = 0; i < period1; i++)
fputc(0x30, fpout);
for (i = 0; i < period1; i++)
fputc(0xd0, fpout);
} else {
/* '0' */
for (i = 0; i < (period0); i++)
fputc(0x10, fpout);
for (i = 0; i < (period0); i++)
fputc(0xf0, fpout);
}
}
extern void nec_rawout(FILE* fpout, unsigned char b)
{
/* bit order is reversed ! */
static unsigned char c[8] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80 };
int i;
/* 1 start bit */
nec_bit(fpout, 0);
/* byte */
for (i = 0; i < 8; i++)
nec_bit(fpout, (b & c[i]));
/* 2 stop bits */
nec_bit(fpout, 1);
nec_bit(fpout, 1);
}
// output file structure
// 1/ prefix (prefix_length bytes)
// 2/ startup (STARTUP_LENGTH bytes)
// 3/ a little patch for rst8 (3 bytes)
// 4/ codeseg
static unsigned char prefix_p6[] = {
0xd3, 0xd3, 0xd3, 0xd3, 0xd3, 0xd3, 0xd3, 0xd3,
0xd3, 0xd3, 0x47, 0x6f, 0x00, 0x00, 0x00, 0x00,
0x0d, 0x84, 0x0a, 0x00, 0xa5, '&', 'H', '8',
'4', '0', 'F', 0x00, 0x00, 0x00, // 30 bytes so far
// LOADER: Here we're at pos $840f or $c40f
// puts the code just after itself and falls in it when finished
205, 0x9a, 0x25, // call $259a ; start tape
6, 5, // ld b,5
205, 0x70, 0x1a, // call $1a70 ; read a single byte
254, 0xaf, // cp $af ; leader tone (af,af,---)
32, 0xf7, // jr nz,$f7 ; -8
16, 0xf7, // djnz $f7 ; -8
// pos [45] and [46]
33, 0x37, 0x84, // ld hl,loc
// pos [48] and [49]
1, 0, 0, // ld bc,len
0xe5, // push hl ; keep entry location
0x1e, 0, // ld e,0
205, 0x70, 0x1a, // call $1a70 ; read a single byte
0x57, // ld d,a
0x83, // add a,e
0x5f, // ld e,a
0x72, // ld (hl),d
0x23, // inc hl
0x0b, // dec bc
0x78, // ld a,b
0xb1, // or c
0x20, 0xf3, // jr nz,$f3 ;-12
205, 0xaa, 0x1a, // call $1aaa ; stop tape
0xe1, // pop hl ; restore program entry loc
// loader size: 40 bytes
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0,
0x9C, 0x9C, 0x9C, 0x9C, 0x9C, 0x9C, // lead for next block
0xAF, 0xAF, 0xAF, 0xAF, 0xAF
};
static int prefix_length_p6 = 100;
static unsigned char prefix_p88[] = {
0xd3, 0xd3, 0xd3, 0xd3, 0xd3, 0xd3, 0xd3, 0xd3, 0xd3, 0xd3, 0x64, 0x65, 0x66, 0x61, 0x6c, 0x74,
0x0d, 0x00, 0x0a, 0x00, 0x97, 0x20, 0xe0, 0xf1, 0x0c, 0x00, 0x01, 0x00, 0x18, 0x00, 0x14, 0x00,
0x41, 0xf1, 0xe0, 0x28, 0x11, 0x29, 0x00, 0x00, 0x00, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20
};
static int prefix_length_p88 = 0x10e;
// char prefix_p88[] = { 0xd3, 0xd3, 0xd3, 0xd3, 0xd3, 0xd3, 0xd3, 0xd3,
// 0xd3, 0xd3, 0x47, 0x6f, 0x00, 0x00, 0x00, 0x00,
// /* 0x0001 */ 0x0d, 0x00, 0x0a, 0x00, 0x97, 0x20, 0xe0, 0xf1,
// 0x0c, 0x1a, 0x00, 0x00, 0x18, 0x00, 0x14, 0x00,
// // ~~~~~~~~~~ start address
// /* 0x0011 */ 0x41, 0xf1, 0xe0, 0x28, 0x11, 0x29, 0x00, 0x00,
// 0x00 }; /* followed by 12 bytes long startup code */
// // 8 9 10 11 12 (here)
unsigned char prefix_rom[] = { 'A', 'B', 0x04, 0x40 };
int prefix_length_rom = 0x4;
int nec_exec(char* target)
{
char filename[FILENAME_MAX + 1];
char wavfile[FILENAME_MAX + 1];
FILE *fpin, *fpout;
int c, i, j;
int len, stage;
int zerocount = 0;
unsigned char* prefix;
int prefix_length;
// int codeseg = 0;
if (binname == NULL) {
return -1;
}
// if (dumb) {
// strcpy(filename,binname);
// } else {
if (origin == -1) {
if ((origin = get_org_addr(crtfile)) == -1) {
fprintf(stderr, "Warning: could not get the code ORG, ORG defaults to MODE1 ($C437)\n");
origin = 0xC437;
}
}
if (mode == -1) {
switch (origin) {
case MODE1_ADDRESS_CODESEG:
mode = MODE1;
break;
case MODE2_ADDRESS_CODESEG:
mode = MODE2;
break;
case MODE5_ADDRESS_CODESEG:
mode = MODE5;
break;
case MODEROM_ADDRESS_CODESEG:
mode = MODEROM;
break;
case MODEN88_ADDRESS_CODESEG:
mode = MODEN88;
break;
default:
fprintf(stderr, "Unhandled value for ORG: %i\n", origin);
return -1;
}
}
//fprintf(stderr,"Mode: %i\n",mode);
if (strcmp(binname, filename) == 0) {
exit_log(1, "Input and output file names must be different\n");
}
if ((fpin = fopen_bin(binname, crtfile)) == NULL) {
exit_log(1,"Can't open input file %s\n", binname);
}
/*
* Now we try to determine the size of the file
* to be converted
*/
if (fseek(fpin, 0, SEEK_END)) {
fclose(fpin);
exit_log(1,"Couldn't determine size of file\n");
}
len = ftell(fpin);
fseek(fpin, 0L, SEEK_SET);
if (outfile == NULL) {
strcpy(filename, binname);
suffix_change(filename, ".cas");
} else {
strcpy(filename, outfile);
}
if ((fpout = fopen(filename, "wb")) == NULL) {
fclose(fpin);
exit_log(1, "Can't open output file %s\n", filename);
}
// MSB of BASIC RAM start address
switch (mode) {
case MODE1:
prefix = prefix_p6;
prefix_length = prefix_length_p6;
prefix[17] = 0xc4;
prefix[46] = 0xc4;
prefix[23] = 'C';
prefix[24] = '4';
prefix[48] = len % 256;
prefix[49] = len / 256;
// codeseg = MODE1_ADDRESS_CODESEG;
break;
case MODE5:
prefix = prefix_p6;
prefix_length = prefix_length_p6;
prefix[17] = 0x80;
prefix[46] = 0x80;
prefix[23] = '8';
prefix[24] = '0';
prefix[48] = len % 256;
prefix[49] = len / 256;
// codeseg = MODE5_ADDRESS_CODESEG;
break;
case MODEN88:
prefix = prefix_p88;
prefix_length = prefix_length_p88;
// codeseg = MODEN88_ADDRESS_CODESEG;
break;
case MODEROM:
prefix = prefix_rom;
prefix_length = prefix_length_rom;
// codeseg = MODEROM_ADDRESS_CODESEG;
break;
case MODE2:
default:
prefix = prefix_p6;
prefix_length = prefix_length_p6;
//prefix[23] = '8';
//prefix[24] = '4';
prefix[48] = len % 256;
prefix[49] = len / 256;
// codeseg = MODE2_ADDRESS_CODESEG;
break;
}
// set p6 file name
for (i = 0; i < 6; i++) {
prefix[i + 0x0a] = filename[i];
}
// write prefix
for (i = 0; i < prefix_length; i++) {
fputc(prefix[i], fpout);
}
/* ... M/C ...*/
for (i = 0; i < len; i++) {
c = getc(fpin);
fputc(c, fpout);
}
if (mode != MODEROM) {
// write suffix
for (i = 0; i < 12; i++) {
fputc(0, fpout);
}
} else {
// write trailing bytes
for (; i < (0x8000 - MODEROM_ADDRESS_CODESEG); i++) {
//putc(memory[i], out);
fputc(0, fpout);
}
}
fclose(fpin);
fclose(fpout);
// }
/* ***************************************** */
/* Now, if requested, create the audio file */
/* ***************************************** */
if ((audio) || (nec_fast) || (nec_22)) {
if ((fpin = fopen(filename, "rb")) == NULL) {
exit_log(1, "Can't open file %s for wave conversion\n", filename);
}
if (fseek(fpin, 0, SEEK_END)) {
fclose(fpin);
exit_log(1,"Couldn't determine size of file\n");
}
len = ftell(fpin);
fseek(fpin, 0, SEEK_SET);
strcpy(wavfile, filename);
suffix_change(wavfile, ".RAW");
if ((fpout = fopen(wavfile, "wb")) == NULL) {
exit_log(1, "Can't open output raw audio file %s\n", wavfile);
}
/* leading silence */
for (i = 0; i < 0x3000; i++)
fputc(0x20, fpout);
/* leading tone */
for (i = 0; i < 3600; i++)
nec_bit(fpout, 1);
stage = 0;
for (i = 0; (i < len); i++) {
c = getc(fpin);
switch (stage) {
// BASIC Header: seek for the filename termination
case 0:
if (c == 0) {
nec_rawout(fpout, 0);
stage++;
for (j = 0; j < 600; j++)
nec_bit(fpout, 1);
c = getc(fpin);
}
break;
// BASIC Block + MC stub: seek for more than 3 zeroes in sequence
case 1:
if ((c == 0) && (zerocount == 3)) {
stage++;
while ((c = getc(fpin)) == 0)
zerocount++;
for (j = 3; j <= zerocount; j++)
nec_rawout(fpout, 0);
zerocount = 0; // Not necessary
for (j = 0; j < 600; j++)
nec_bit(fpout, 1);
}
break;
default:
break;
//fprintf(stderr,"Problems",origin);
//return -1;
}
nec_rawout(fpout, c);
if (c)
zerocount = 0;
else
zerocount++;
}
// tail
for (j = 0; j < 200; j++)
nec_bit(fpout, 1);
/* Data blocks */
//while (ftell(fpin) < len) {
/* leader tone (3600 records of bit 1) */
// for (i=0; i < 3600; i++)
// nec_bit (fpout,1);
/* data block */
// blocklen = (getc(fpin) + 256 * getc(fpin));
// for (i=0; (i < blocklen); i++) {
// c=getc(fpin);
// nec_rawout(fpout,c);
// }
//}
/* trailing silence */
for (i = 0; i < 0x10000; i++)
fputc(0x20, fpout);
fclose(fpin);
fclose(fpout);
/* Now complete with the WAV header */
if (nec_22)
raw2wav_22k(wavfile,2);
else
raw2wav(wavfile);
}
exit(0);
}