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// tape.c
//
// 20060803 Markku Alén
#include "tape.h"
#include "cpu.h"
#include "mem.h"
#include "prg_file.h"
#define STATUS (ram[0x90])
#define VERCKK (ram[0x93])
#define EAL (ram[0xae] | (ram[0xaf] << 8))
#define TBUFFR (ram[0xb2] | (ram[0xb3] << 8))
#define FNLEN (ram[0xb7])
#define FNADR (ram[0xbb] | (ram[0xbc] << 8))
#define STAL (ram[0xc1] | (ram[0xc2] << 8))
#define IRQTMP (ram[0x2a0])
#define OFFSET_TYPE 0
#define OFFSET_START_ADDR 1
#define OFFSET_END_ADDR 3
#define OFFSET_NAME 5
#define TYPE_PRG 1 /* Binary Program */
#define TYPE_BAS 3 /* Relocatable Program */
#define TYPE_DATA 4 /* Data Record */
#define TYPE_EOF 5 /* End of Tape marker */
#define FIND_RET 0xF732
#define WRITE_RET 0xF7C1
#define TRANSFER_RET 0xFC93
#define WRITE_LEADER 0x0a
#define WRITE_BLOCK 0x08
#define READ_BLOCK 0x0e
#define EOF 0x40
static void copy_to_ram(int addr, int len, const void *buf)
{
while(len-- > 0)
ram[addr + len] = ((char *)buf)[len];
}
static void setup_tape_hdr(int type, const char *filename, int start_addr, int stop_addr)
{
int i;
char c, *p;
p = &ram[TBUFFR];
for(i = 0;i < 16;i++)
{
c = *filename;
if(c != '\0')
filename++;
p[OFFSET_NAME + i] = c;
}
p[OFFSET_TYPE] = type;
p[OFFSET_START_ADDR + 0] = start_addr % 256;
p[OFFSET_START_ADDR + 1] = start_addr / 256;
p[OFFSET_END_ADDR + 0] = stop_addr % 256;
p[OFFSET_END_ADDR + 1] = stop_addr / 256;
}
static char filename[15 + 1];
static void get_filename(void)
{
int i;
char c, *p;
p = &ram[FNADR];
for(i = 0;i < (sizeof(filename) - 1);i++)
{
c = *(p++);
if(c < '0' || c > '9')
{
if(c < 'A' || c > 'Z')
{
if(c < 'a' || c > 'z')
{
if(c != '.' && c != '_')
c = '.';
}
}
}
filename[i] = c;
}
if(i > FNLEN)
i = FNLEN;
filename[i] = '\0';
}
static int find_header(void)
{
int err;
err = 0;
get_filename();
if(prg_load(filename) != 0)
err = -1;
if(err == 0)
setup_tape_hdr(TYPE_BAS, filename, prg_addr, prg_addr + prg_len);
STATUS = 0x00;
VERCKK = 0x00;
IRQTMP = 0x00;
set_c_flag(err != 0);
set_z_flag(0);
set_pc(FIND_RET);
return 0;
}
static int write_header(void)
{
int i;
i=0;
}
static int tape_transfer(void)
{
int i;
int err;
int start, end, len;
int st;
err = 0;
start = STAL;
end = EAL;
len = end - start;
st = 0x00;
switch(get_x())
{
case WRITE_LEADER:
break;
case WRITE_BLOCK:
// if (fwrite(ram + start, len, 1, tape->FileDs) == 1) {
// st |= 0x40; /* EOF */
// }
// else {
// st |= 0xB4; /* All possible errors... */
//
// fprintf(stderr, "Error: Tape write failed.\n");
// }
// break;
i=0;
case READ_BLOCK:
copy_to_ram(start, len, prg_data);
st |= EOF;
break;
default:
err = -1;
}
IRQTMP = 0x00;
STATUS |= st;
set_c_flag(err != 0);
set_pc(TRANSFER_RET);
return 0;
}
static trap_t traps[] =
{
TRAP_INIT(0xF72F, 0x20, 0x41, 0xF8, &find_header),
TRAP_INIT(0xF7BE, 0x20, 0x6B, 0xF8, &write_header),
TRAP_INIT(0xF8A1, 0x20, 0xBD, 0xFC, &tape_transfer),
};
void init_tape(void)
{
install_traps(sizeof(traps) / sizeof(traps[0]), traps, &poke, &peek);
}
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