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/*
casm - Simple, portable assembler
Copyright (C) 2003-2015 Ian Cowburn (ianc@noddybox.demon.co.uk)
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 3 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, see <http://www.gnu.org/licenses/>.
-------------------------------------------------------------------------
ZX81 tape output handler.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "global.h"
#include "codepage.h"
#include "zx81out.h"
/* ---------------------------------------- MACROS & TYPES
*/
enum option_t
{
OPT_MARGIN,
OPT_AUTORUN,
OPT_DFILE_COLLAPSED
};
static const ValueTable option_set[] =
{
{"zx81-margin", OPT_MARGIN},
{"zx81-autorun", OPT_AUTORUN},
{"zx81-collapse-dfile", OPT_DFILE_COLLAPSED},
{NULL}
};
typedef enum
{
PAL = 55,
NTSC = 31
} TVFormat;
static ValueTable format_table[] =
{
{"pal", PAL},
{"NTSC", NTSC},
{NULL}
};
static TVFormat tv_format = PAL;
static int run = TRUE;
static int collapse_dfile = FALSE;
/* ---------------------------------------- PRIVATE FUNCTIONS
*/
static int PokeB(Byte *mem, int addr, Byte b)
{
mem[addr++] = b;
return (addr % 0x10000);
}
static int PokeW(Byte *mem, int addr, int w)
{
addr = PokeB(mem, addr, w & 0xff);
return PokeB(mem, addr, (w & 0xff00) >> 8);
}
/* ---------------------------------------- INTERFACES
*/
const ValueTable *ZX81OutputOptions(void)
{
return option_set;
}
CommandStatus ZX81OutputSetOption(int opt, int argc, char *argv[],
int quoted[],
char *err, size_t errsize)
{
const ValueTable *val;
CMD_ARGC_CHECK(1);
switch(opt)
{
case OPT_MARGIN:
CMD_TABLE(argv[0], format_table, val);
tv_format = val->value;
break;
case OPT_AUTORUN:
run = ParseTrueFalse(argv[0], TRUE);
break;
case OPT_DFILE_COLLAPSED:
collapse_dfile = ParseTrueFalse(argv[0], TRUE);
break;
default:
break;
}
return CMD_OK;
}
int ZX81Output(const char *filename, const char *filename_bank,
MemoryBank **bank, int count, char *error, size_t error_size)
{
static const int line[] =
{
0, 10, 14, 0, 0xf9, 0xd4, 0x1d, 0x22, 0x21, 0x1d,
0x20, 0x7e, 0x8f, 0x01, 0x04, 0x00, 0x00, 0x76, -1
};
FILE *fp = fopen(filename, "wb");
Byte *mem;
int min;
int max;
int len;
int next;
int dfile;
int vars;
int addr;
int f;
mem = bank[0]->memory;
min = bank[0]->min_address_used;
max = bank[0]->max_address_used;
len = max - min + 1;
if (min != 16514)
{
snprintf(error, error_size, "Code must start at 16514 to work with the "
"ZX81 output driver.");
return FALSE;
}
if (!fp)
{
snprintf(error, error_size, "Failed to create %s", filename);
return FALSE;
}
/* Create the system variables and BASIC program around the supplied code.
BASIC is done first to calculate various system variables.
*/
addr = 16509;
/* Program line with REM statement
*/
addr = PokeW(mem, addr, 0x0000); /* Line number */
addr = PokeW(mem, addr, len + 2); /* Line length */
addr = PokeB(mem, addr, 0xea); /* REM token */
addr += len; /* Skip code */
addr = PokeB(mem, addr, 0x76); /* NL token */
/* Program line to launch the code
*/
next = addr;
f = 0;
while (line[f] != -1)
{
addr = PokeB(mem, addr, line[f++]);
}
/* Display file
*/
dfile = addr;
if (collapse_dfile)
{
for(f = 0; f < 25; f++)
{
addr = PokeB(mem, addr, 0x76);
}
}
else
{
addr = PokeB(mem, addr, 0x76);
for(f = 0; f < 24; f++)
{
int n;
for(n = 0; n < 32; n++)
{
addr = PokeB(mem, addr, 0);
}
addr = PokeB(mem, addr, 0x76);
}
}
/* Vars
*/
vars = addr;
addr = PokeB(mem, addr, 0x80);
/* System variables
*/
addr = 0x4009;
addr = PokeB(mem, addr, 0); /* VERSN */
addr = PokeW(mem, addr, 0); /* E_PPC */
addr = PokeW(mem, addr, dfile); /* D_FILE */
addr = PokeW(mem, addr, dfile + 1); /* DF_CC */
addr = PokeW(mem, addr, vars); /* VARS */
addr = PokeW(mem, addr, 0); /* DEST */
addr = PokeW(mem, addr, vars + 1); /* E_LINE */
addr = PokeW(mem, addr, vars - 1); /* CH_ADD */
addr = PokeW(mem, addr, 0); /* X_PTR */
addr = PokeW(mem, addr, vars + 5); /* STKBOT */
addr = PokeW(mem, addr, vars + 5); /* STKEND */
addr = PokeB(mem, addr, 0); /* BREG */
addr = PokeW(mem, addr, 16477); /* MEM */
addr = PokeB(mem, addr, 0); /* unused */
addr = PokeB(mem, addr, 2); /* DF_SZ */
addr = PokeW(mem, addr, 2); /* S_TOP */
addr = PokeW(mem, addr, 0xffff); /* LAST_K */
addr = PokeB(mem, addr, 0xff); /* LAST_K */
addr = PokeB(mem, addr, tv_format); /* MARGIN */
addr = PokeW(mem, addr, run ? next : dfile);/* NXTLIN */
addr = PokeW(mem, addr, 0); /* OLDPPC */
addr = PokeB(mem, addr, 0); /* FLAGX */
addr = PokeW(mem, addr, 0); /* STRLEN */
addr = PokeW(mem, addr, 0xc8d); /* T_ADDR */
addr = PokeW(mem, addr, 0); /* SEED */
addr = PokeW(mem, addr, 0x0ffff); /* FRAMES */
addr = PokeW(mem, addr, 0); /* COORDS */
addr = PokeB(mem, addr, 0xbc); /* PR_CC */
addr = PokeB(mem, addr, 33); /* S_POSN */
addr = PokeB(mem, addr, 24); /* S_POSN */
addr = PokeW(mem, addr, 0x40); /* CDFLAG */
/* Write the constructed P file
*/
fwrite(mem + 0x4009, vars - 0x4009 + 1, 1, fp);
fclose(fp);
return TRUE;
}
/*
vim: ai sw=4 ts=8 expandtab
*/
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