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exor.c
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/* EXORcister simulator
* Copyright
* (C) 2011 Joseph H. Allen
*
* This 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 1, or (at your option) any later version.
*
* It 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 software; see the file COPYING. If not, write to the Free Software Foundation,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* Exorciser / swtpc emulator */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <sys/poll.h>
#include <signal.h>
#include "sim6800.h"
#include "exor.h"
#include "exorterm.h"
/* Options */
int swtpc = 0;
char *exbug_name; /* = "exbug.bin"; */
int trace_disk = 0; /* Enable disk trace */
int lower = 0; /* Allow lower case */
/* Diskettes */
struct drive_info {
char *name;
FILE *f;
int bytes; /* Bytes per sector */
int tracks; /* Tracks per disk */
int sects; /* Sectors per track */
} drive[4] =
{
{ 0, 0, 0, 0, 0 },
{ 0, 0, 0, 0, 0 },
{ 0, 0, 0, 0, 0 },
{ 0, 0, 0, 0, 0 }
};
/* Memory */
unsigned char mem[65536];
int pending_read_ahead = 1;
unsigned char read_ahead_c;
int count = 10;
int polling = 1; /* Allow ACIA polling */
int _saved;
void getsect(int n, int addr, int sect, int len)
{
if (trace_disk) printf("Read sector %d into %x, size=%d\n", sect, addr, len);
if (drive[n].f) {
fseek(drive[n].f, sect * drive[n].bytes, SEEK_SET);
fread(mem + addr, len, 1, drive[n].f);
} else {
printf("Tried to read from non-existent disk %d\n", n);
stop = 1;
}
}
void getsect1(int n, unsigned char *addr, int ofst, int len)
{
if (trace_disk) printf("Read sector %d\n", ofst / 256);
fseek(drive[n].f, ofst, SEEK_SET);
fread(addr, len, 1, drive[n].f);
}
void putsect(int n, int addr, int sect, int len)
{
if (trace_disk) printf("Write sector %d into %x, size=%d\n", sect, addr, len);
if (drive[n].f) {
fseek(drive[n].f, sect * drive[n].bytes, SEEK_SET);
fwrite(mem + addr, len, 1, drive[n].f);
fflush(drive[n].f);
} else {
printf("Tried to write to non-existent disk %d\n", n);
stop = 1;
}
}
void putsect1(int n, unsigned char *addr, int ofst, int len)
{
if (trace_disk) printf("Write sector %d\n", ofst / 256);
fseek(drive[n].f, ofst, SEEK_SET);
fwrite(addr, len, 1, drive[n].f);
fflush(drive[n].f);
}
/* FD1771 emulation.. */
int cur_drive = 0;
int cur_sect = 1;
int cur_track = 0;
unsigned char cur_status = 0;
unsigned char cur_buf[256];
int cur_count;
unsigned char cur_data;
int cur_state; /* 0 = IDLE, 1 = read single, 2 = read multiple, 3 = write single */
int cur_dir = 1;
int count1;
/* All memory reads go through this function */
unsigned char mread(unsigned short addr)
{
unsigned char c;
int rtn;
if (swtpc) {
switch (addr) {
#if 0
case 0x8004: {
if (count--)
return 0x00;
else {
count = 10;
return 0x03;
}
#endif
case 0x8004: { /* Check serial port status */
if (polling) {
int flags;
if (pending_read_ahead)
return 0x03;
flags = fcntl(fileno(stdin), F_GETFL);
if (flags == -1) {
printf("fcntl error\n");
exit(-1);
}
fcntl(fileno(stdin), F_SETFL, flags | O_NONBLOCK);
rtn = read(fileno(stdin), &read_ahead_c, 1);
fcntl(fileno(stdin), F_SETFL, flags);
if (rtn == 1) {
count = 0;
pending_read_ahead = 1;
return 0x03;
} else {
skip:
if (count == 1000)
poll(NULL, 0, 1); /* Don't hog CPU time */
else
++count;
return 0x02;
}
} else {
/* No polling: return false then true */
if (count--)
return 0x00;
else {
count = 10;
return 0x03;
}
}
} case 0x8005: { /* Read from serial port */
if (polling) {
c = read_ahead_c;
pending_read_ahead = 0;
} else {
int rtn = 0;
int flags = fcntl(fileno(stdin), F_GETFL);
c = '?';
if (flags == -1) {
printf("fcntl error\n");
exit(-1);
}
while (rtn < 1 && !stop) {
fcntl(fileno(stdin), F_SETFL, flags | O_NONBLOCK);
rtn = read(fileno(stdin), &c, 1);
fcntl(fileno(stdin), F_SETFL, flags);
if (rtn < 1 && !stop) {
poll(NULL, 0, 8); /* Don't hog CPU time */
}
}
}
if (!lower && c >= 'a' && c <= 'z')
c += 'A' - 'a';
if (swtpc) {
if (c == 127)
c = 8;
} else {
if (c == 8)
c = 127;
}
_saved = c;
return c;
} case 0x8007: { /* Alias, used to test if this is really an ACIA */
return _saved;
} case 0x8018: { /* status */
if (cur_state == 1) {
if (count1) {
if (!--count1) {
/* Not readying? Give lost data. */
/* The code sometimes reads without taking data to verify a previous
write (by checking for CRC error). */
cur_state = 0;
cur_status = 0x04;
}
}
}
return cur_status;
} case 0x8019: { /* track */
return cur_track;
} case 0x801a: { /* sector */
return cur_sect;
} case 0x801b: { /* data */
/* printf("Read %d\n", cur_state); */
if (cur_state == 1) {
count1 = 100;
c = cur_buf[cur_count++];
if (cur_count == drive[cur_drive].bytes) {
/* printf("Sector %d done\n", cur_sect); */
cur_state = 0;
cur_status = 0;
}
return c;
} else if (cur_state == 2) {
count1 = 100;
c = cur_buf[cur_count++];
if (cur_count == drive[cur_drive].bytes) {
if (cur_sect == drive[cur_drive].sects) {
/* printf("Sector %d done, track done.\n", cur_sect); */
cur_status = 0; /* All done! */
cur_state = 0;
} else {
/* printf("Sector %d done\n", cur_sect); */
++cur_sect;
cur_count = 0;
getsect1(cur_drive, cur_buf, (cur_track * drive[cur_drive].sects + (cur_sect - 1)) * drive[cur_drive].bytes, drive[cur_drive].bytes);
}
}
return c;
} else {
return 0;
}
} default: {
return mem[addr];
}
}
} else {
switch (addr) {
case 0xFCF9: {
return 0x80;
} case 0xFCF8: {
return 0xF;
} case 0xFCF4: {
if (count--)
return 0x00;
else {
count = 10;
return 0x03;
}
#if 0
} case 0xFCF4: { /* Check serial port status */
if (polling) {
int flags;
if (pending_read_ahead)
return 0x03;
flags = fcntl(fileno(stdin), F_GETFL);
if (flags == -1) {
printf("fcntl error\n");
exit(-1);
}
fcntl(fileno(stdin), F_SETFL, flags | O_NONBLOCK);
rtn = read(fileno(stdin), &read_ahead_c, 1);
fcntl(fileno(stdin), F_SETFL, flags);
if (rtn == 1) {
count = 0;
pending_read_ahead = 1;
return 0x03;
} else {
skip:
if (count == 1000)
poll(NULL, 0, 1); /* Don't hog CPU time */
else
++count;
return 0x02;
}
} else {
/* No polling: return false then true */
if (count--)
return 0x00;
else {
count = 10;
return 0x03;
}
}
} case 0xFCF5: { /* Read from serial port */
if (polling) {
c = read_ahead_c;
pending_read_ahead = 0;
} else {
int rtn = 0;
int flags = fcntl(fileno(stdin), F_GETFL);
c = '?';
if (flags == -1) {
printf("fcntl error\n");
exit(-1);
}
while (rtn < 1 && !stop) {
fcntl(fileno(stdin), F_SETFL, flags | O_NONBLOCK);
rtn = read(fileno(stdin), &c, 1);
fcntl(fileno(stdin), F_SETFL, flags);
if (rtn < 1 && !stop) {
poll(NULL, 0, 8); /* Don't hog CPU time */
}
}
}
if (!lower && c >= 'a' && c <= 'z')
c += 'A' - 'a';
if (swtpc) {
if (c == 127)
c = 8;
} else {
if (c == 8)
c = 127;
}
return c;
#endif
} default: {
return mem[addr];
}
}
}
}
/* All memory writes go through this function */
void mwrite(unsigned short addr, unsigned char data)
{
if (swtpc) {
/* Do not write to ROM */
if (addr >= 0xe000 && addr < 0xe400)
return;
mem[addr] = data;
switch (addr) {
case 0x8018: { /* Command */
switch (data & 0xF0) {
case 0x00: { /* Restore */
/* printf("FD1771 restore!\n"); */
cur_track = 0;
cur_sect = 1;
cur_dir = 1;
if (drive[cur_drive].f)
cur_status = 0x00;
else
cur_status = 0xD0;
break;
} case 0x10: { /* Seek */
/* printf("FD1771 seek to track %d\n", cur_data); */
cur_track = cur_data;
if (drive[cur_drive].f)
cur_status = 0x00;
else
cur_status = 0xD0;
break;
} case 0x30: { /* Step */
printf("FD1771 tried to step\n");
if ((int)cur_track + cur_dir != -1)
cur_track += cur_dir;
cur_state = 0x00;
if (drive[cur_drive].f)
cur_status = 0x00;
else
cur_status = 0xD0;
break;
} case 0x50: { /* Step in */
printf("FD1771 tried to step in\n");
++cur_track;
cur_dir = 1;
if (drive[cur_drive].f)
cur_status = 0x00;
else
cur_status = 0xD0;
break;
} case 0x70: { /* Step out */
printf("FD1771 tried to step out\n");
if (cur_track)
--cur_track;
cur_dir = -1;
if (drive[cur_drive].f)
cur_status = 0x00;
else
cur_status = 0xD0;
break;
} case 0x80: { /* Read single */
/* printf("FD1771 read single\n"); */
if (drive[cur_drive].f) {
getsect1(cur_drive, cur_buf, (cur_track * drive[cur_drive].sects + (cur_sect - 1)) * drive[cur_drive].bytes, drive[cur_drive].bytes);
cur_state = 1;
cur_count = 0;
cur_status = 0x03; /* DRQ + BUSY */
count1 = 100;
} else {
cur_status = 0x90;
}
break;
} case 0x90: { /* Read multiple */
/* printf("FD1771 read multiple\n"); */
if (drive[cur_drive].f) {
getsect1(cur_drive, cur_buf, (cur_track * drive[cur_drive].sects + (cur_sect - 1)) * drive[cur_drive].bytes, drive[cur_drive].bytes);
cur_state = 2;
cur_count = 0;
cur_status = 0x03; /* DRQ + BUSY */
} else {
cur_status = 0x90;
}
break;
} case 0xA0: { /* Write single */
if (drive[cur_drive].f) {
cur_state = 3;
cur_count = 0;
cur_status = 0x03; /* DQA + BUSY */
} else {
cur_status = 0x90;
}
/* printf("FD1771 write single\n"); */
break;
} case 0xB0: { /* Write multiple */
printf("FD1771 tried to write multiple\n");
break;
} case 0xC0: { /* Read track */
printf("FD1771 tried to read track\n");
break;
} case 0xF0: { /* Write track */
printf("FD1771 tried to write track\n");
break;
} case 0xD0: { /* Force interrupt */
break;
} default: {
printf("Unknown FD1771 command %x\n", data);
exit(-1);
}
}
break;
} case 0x8014: { /* Set drive */
cur_drive = (data & 3);
/* printf("Set drive to %x\n", data); */
break;
} case 0x8019: { /* Track */
/* printf("Set track = %d\n", data); */
cur_track = data;
break;
} case 0x801a: { /* Sector */
/* printf("Set sector = %d\n", data); */
if (!data)
data = 1;
cur_sect = data;
break;
} case 0x801b: { /* Data */
cur_data = data;
if (cur_state == 3) {
/* printf("Write data %d\n", cur_count); */
cur_buf[cur_count++] = data;
if (cur_count == drive[cur_drive].bytes) {
printf("Write done.\n");
cur_state = 0;
cur_status = 0;
putsect1(cur_drive, cur_buf, (cur_track * drive[cur_drive].sects + (cur_sect - 1)) * drive[cur_drive].bytes, drive[cur_drive].bytes);
}
}
break;
} case 0x8005: { /* Write to serial port */
putchar(data); fflush(stdout);
break;
}
}
} else {
/* Do not write to ROM */
if (addr >= 0xE800 && addr < 0xEC00 ||
addr >= 0xF000 && addr < 0xFC00 ||
addr >= 0xFCFC && addr < 0xFD00)
return;
mem[addr] = data;
switch (addr) {
case 0xFCF5: { /* Write to serial port */
term_out(data);
/* putchar(data); fflush(stdout); */
}
}
}
}
unsigned short pull2();
/* Addresses of floppy parameters */
#define CURDRV 0 /* Current drive: 0 -3 */
#define STRSCT 1 /* Starting sector (2 bytes) */
#define NUMSCT 3 /* Number of sectors (2 bytes) */
#define LSCTLN 5 /* Length of last sector (1 byte) */
#define CURADR 6 /* Transfer address (2 bytes) */
#define FDSTAT 8 /* Error status: 0x30 means no error */
#define SCTCNT 0x0B /* Sector count (2 byts): (STRSCT + NUMSCT - SCTCNT - 1) is bad sector number */
#define SIDES 0x0D /* bit 7 = 1 means single-sided, bit 7 = 0 means double-sided */
/* MDOS disk error codes for FDSTAT */
#define ER_NON '0' /* No error */
#define ER_CRC '1' /* Data CRC error */
#define ER_WRT '2' /* Write protected disk */
#define ER_RDY '3' /* Disk not ready */
#define ER_MRK '4' /* Deleted data mark encountered */
#define ER_TIM '5' /* Timeout */
#define ER_DAD '6' /* Invalid disk address */
#define ER_SEK '7' /* Seek error */
#define ER_DMA '8' /* Data address mark error */
#define ER_ACR '9' /* Address mark CRC error */
/* Check drive number */
int check_drive(int n)
{
if (n >= 4) {
// printf("\r\nFloppy error: attempt to access drive number %d >= 4\n", n);
mem[FDSTAT] = ER_RDY;
c_flag = 1;
return -1;
}
if (!drive[n].f) {
// printf("\r\nFloppy error: attempt to access non-existent disk %d\n", n);
mem[FDSTAT] = ER_RDY;
c_flag = 1;
return -1;
}
return 0;
}
/* Check sector number */
int check_sect(int n, int sect)
{
if (sect >= drive[n].sects * drive[n].tracks) {
printf("\r\nFloppy error: attempt to access past end of disk %d, sector %d\n", n, sect);
mem[FDSTAT] = ER_DAD;
c_flag = 1;
return -1;
}
return 0;
}
/* All jumps go through this function */
void jump(unsigned short addr)
{
if (swtpc) {
pc = addr;
return;
} else {
switch (addr) {
/* Too many programs access ACIA directly */
#if 0
case 0xF9CF: case 0xF9DC: /* Output a character */ {
term_out(acca);
/* putchar(acca); fflush(stdout); */
c_flag = 0; /* Carry is error status */
break;
}
#endif
case 0xFA8B: /* Input a character */ {
acca = term_in();
if (!mem[0xFF53]) { /* Echo */
term_out(acca);
/* putchar(c);
fflush(stdout); */
} else {
mem[0xFF53] = 0;
}
c_flag = 0; /* No error */
break;
}
case 0xE800: /* OSLOAD (no modified parms) */ {
printf("\nOSLOAD...\n");
getsect(0, 0x0020, 23, 128);
getsect(0, 0x0020 + 0x0080, 24, 128);
pc = 0x0020;
sp = 0x00FF;
return;
} case 0xE822: /* FDINIT (no modified parms) */ {
c_flag = 0;
break;
}
#if 0
case 0xF853: /* CHKERR */ {
break;
} case 0xE85A: /* PRNTER */ {
break;
}
#endif
case 0xE869: /* READSC (read full sectors) */ {
mem[LSCTLN] = 128;
} case 0xE86D: /* READPS (read partial sectors) (FDSTAT, carry, sides) */ {
int x;
int n = mem[CURDRV];
int first = (mem[STRSCT] << 8) + mem[STRSCT + 1];
int num = (mem[NUMSCT] << 8) + mem[NUMSCT + 1];
int addr = (mem[CURADR] << 8) + mem[CURADR + 1];
int last = mem[LSCTLN];
if (trace_disk) printf("Read sectors: drive=%d, first=%d, number=%d, addr=%x, size of last=%d\n", n, first, num,
addr, last);
if (check_drive(n))
break;
for (x = 0; x != num; ++x) {
if (check_sect(n, first + x))
goto oops;
getsect(n, addr + 128 * x, first + x, ((x + 1 == num) ? mem[LSCTLN] : 128));
}
mem[FDSTAT] = ER_NON;
if (drive[n].tracks == 77)
mem[SIDES] = 0x80;
else
mem[SIDES] = 0;
c_flag = 0;
oops: break;
} case 0xE86F: /* RDCRC */ {
if (trace_disk) printf("RDCRC\n");
int x;
int n = mem[CURDRV];
int first = (mem[STRSCT] << 8) + mem[STRSCT + 1];
int num = (mem[NUMSCT] << 8) + mem[NUMSCT + 1];
int addr = (mem[CURADR] << 8) + mem[CURADR + 1];
int last = mem[LSCTLN];
if (trace_disk) printf("RDCRC: drive=%d, first=%d, number=%d, addr=%x, size of last=%d\n", n, first, num,
addr, last);
if (check_drive(n))
break;
for (x = 0; x != num; ++x) {
if (check_sect(n, first + x))
goto oops;
}
mem[FDSTAT] = ER_NON;
if (drive[n].tracks == 77)
mem[SIDES] = 0x80;
else
mem[SIDES] = 0;
c_flag = 0;
break;
} case 0xE875: /* RESTOR */ {
int n = mem[CURDRV];
if (trace_disk) printf("RESTOR\n");
if (check_drive(n))
break;
mem[FDSTAT] = ER_NON;
if (drive[n].tracks == 77)
mem[SIDES] = 0x80;
else
mem[SIDES] = 0;
c_flag = 0;
break;
} case 0xE878: /* SEEK */ {
int n = mem[CURDRV];
int first = (mem[STRSCT] << 8) + mem[STRSCT + 1];
if (trace_disk) printf("SEEK\n");
if (check_drive(n))
break;
if (check_sect(n, first))
break;
if (drive[n].tracks == 77)
mem[SIDES] = 0x80;
else
mem[SIDES] = 0;
c_flag = 0;
break;
} case 0xE872: /* RWTEST */ {
if (trace_disk) printf("RWTEST\n");
} case 0xE87B: /* WRTEST */ {
unsigned char buf[128];
int x;
int n = mem[CURDRV];
int first = (mem[STRSCT] << 8) + mem[STRSCT + 1];
int num = (mem[NUMSCT] << 8) + mem[NUMSCT + 1];
int addr = (mem[CURADR] << 8) + mem[CURADR + 1];
int last = mem[LSCTLN];
if (trace_disk) printf("WRTEST\n");
if (check_drive(n))
break;
for (x = 0; x != 128; x += 2) {
buf[x] = mem[addr];
buf[x + 1] = mem[addr + 1];
}
for(x=0; x != num; ++x) {
if (check_sect(n, first + x))
goto oops;
if (trace_disk) printf("Wrtest sector %d drive %d\n", first + x, n);
fseek(drive[n].f, (first + x) * 128, SEEK_SET);
fwrite(buf, 128, 1, drive[n].f);
fflush(drive[n].f);
}
c_flag = 0;
if (drive[n].tracks == 77)
mem[SIDES] = 0x80;
else
mem[SIDES] = 0;
mem[FDSTAT] = ER_NON;
break;
} case 0xE87E: /* WRDDAM */ {
int n = mem[CURDRV];
printf("\r\nFloppy error: we do not support WRDDAM\n");
c_flag = 1;
if (drive[n].tracks == 77)
mem[SIDES] = 0x80;
else
mem[SIDES] = 0;
mem[FDSTAT] = ER_WRT;
break;
} case 0xE884: /* WRITSC */ {
if (trace_disk) printf("WRITSC\n");
} case 0xE881: /* WRVERF */ {
int x;
int n = mem[CURDRV];
int first = (mem[STRSCT] << 8) + mem[STRSCT + 1];
int num = (mem[NUMSCT] << 8) + mem[NUMSCT + 1];
int addr = (mem[CURADR] << 8) + mem[CURADR + 1];
int last = mem[LSCTLN];
if (trace_disk) printf("WRVERF: drive=%d, first=%d, number=%d, addr=%x, size of last=%d\n", n, first, num,
addr, last);
if (check_drive(n))
break;
for(x=0; x != num; ++x) {
if (check_sect(n, first + x))
goto oops;
putsect(n, addr + 128 * x, first + x, 128);
}
if (drive[n].tracks == 77)
mem[SIDES] = 0x80;
else
mem[SIDES] = 0;
mem[FDSTAT] = ER_NON;
c_flag = 0;
break;
} case 0xE887: /* CLOCK */ {
printf("Floppy: Someone called CLOCK?\n");
c_flag = 0;
break;
} case 0xEBC0: /* LPINIT */ {
if (trace_disk) printf("LPINIT\n");
c_flag = 0;
break;
} case 0xEBCC: /* LIST */ {
if (trace_disk) printf("LIST\n");
term_out(acca);
/* putchar(acca); fflush(stdout); */
c_flag = 0;
break;
} case 0xEBE4: /* LDATA */ {
if (trace_disk)printf("LDATA\n");
while (mem[ix] != 4) {
term_out(mem[ix]);
/* putchar(mem[ix]); */
++ix;
}
term_out('\r');
term_out('\n');
/* printf("\n"); */
c_flag = 0;
break;
} case 0xEBF2: /* LDATA1 */ {
if (trace_disk) printf("LDATA1\n");
while (mem[ix] != 4) {
/* putchar(mem[ix]); */
term_out(mem[ix]);
++ix;
}
/* fflush(stdout); */
c_flag = 0;
break;
} default: {
pc = addr;
return;
}
}
simulated(addr);
addr = pull2();
jump(addr);
}
}
int load_exbug()
{
FILE *f = fopen(exbug_name, "r");
if (!f) {
fprintf(stderr, "Couldn't load '%s'\n", exbug_name);
return -1;
}
if (1 != fread(mem, 64 * 1024, 1, f)) {
fprintf(stderr, "Couldn't read '%s'\n", exbug_name);
return -1;
}
printf("'%s' loaded.\n", exbug_name);
fclose(f);
return 0;
}
int load_drive(int n)
{
FILE *f;
long t;
f = fopen(drive[n].name, "r+");
if (!f) {
fprintf(stderr, "Couldn't open '%s'\n", drive[n].name);
return -1;
}
fseek(f, 0, SEEK_END);
t = ftell(f);
if (swtpc) {
if (t == 256 * 10 * 35) {
drive[n].bytes = 256;
drive[n].sects = 10;
drive[n].tracks = 35;
drive[n].f = f;
printf("'%s' opened for drive %d (tracks=%d sectors=%d)\n", drive[n].name, n, drive[cur_drive].tracks, drive[cur_drive].sects);
} else if (t == 256 * 10 * 40) {
drive[n].bytes = 256;
drive[n].sects = 10;
drive[n].tracks = 40;
drive[n].f = f;
printf("'%s' opened for drive %d (tracks=%d sectors=%d)\n", drive[n].name, n, drive[n].tracks, drive[n].sects);
} else if (t == 256 * 20 * 35) {
drive[n].bytes = 256;
drive[n].sects = 20;
drive[n].tracks = 35;
drive[n].f = f;
printf("'%s' opened for drive %d (tracks=%d sectors=%d)\n", drive[n].name, n, drive[n].tracks, drive[n].sects);
} else if (t == 256 * 20 * 40) {
drive[n].bytes = 256;
drive[n].sects = 20;
drive[n].tracks = 40;
drive[n].f = f;
printf("'%s' opened for drive %d (tracks=%d sectors=%d)\n", drive[n].name, n, drive[n].tracks, drive[n].sects);
} else if (t == 256 * 18 * 80) {
drive[n].bytes = 256;
drive[n].sects = 18;
drive[n].tracks = 80;
drive[n].f = f;
printf("'%s' opened for drive %d (tracks=%d sectors=%d)\n", drive[n].name, n, drive[n].tracks, drive[n].sects);
} else if (t == 256 * 20 * 80) {
drive[n].bytes = 256;
drive[n].sects = 20;
drive[n].tracks = 80;
drive[n].f = f;
printf("'%s' opened for drive %d (tracks=%d sectors=%d)\n", drive[n].name, n, drive[n].tracks, drive[n].sects);
} else if (t == 256 * 36 * 80) {
drive[n].bytes = 256;
drive[n].sects = 36;
drive[n].tracks = 80;
drive[n].f = f;
printf("'%s' opened for drive %d (tracks=%d sectors=%d)\n", drive[n].name, n, drive[n].tracks, drive[n].sects);
} else if (t == 256 * 72 * 80) {
drive[n].bytes = 256;
drive[n].sects = 72;
drive[n].tracks = 80;
drive[n].f = f;
printf("'%s' opened for drive %d (tracks=%d sectors=%d)\n", drive[n].name, n, drive[n].tracks, drive[n].sects);
} else {
fclose(f);
printf("'%s' is not a valid disk\n", drive[n].name);
return -1;
}
} else {
if (t == 128 * 26 * 77) {
printf("'%s' opened for drive %d (single sided)\n", drive[n].name, n);
drive[n].f = f;
drive[n].bytes = 128;
drive[n].tracks = 77;
drive[n].sects = 26;
} else if (t == 128 * 26 * 77 * 2) {
printf("'%s' opened for drive %d (double sided)\n", drive[n].name, n);
drive[n].f = f;
drive[n].bytes = 128;
drive[n].tracks = 77 * 2;
drive[n].sects = 26;
} else {
fclose(f);
printf("'%s' is not a valid disk: it's size must be %d or %d\n", drive[n].name, 128*26*77*2, 128*26*77);
return -1;
}
}
return 0;
}
void ctrl_c()
{
printf("Interrupt!\n");
stop = 1;
}
int main(int argc, char *argv[])
{
int x;
int diskn = 0;
int gotox = 0;
mon_out = stdout;
mon_in = stdin;
char *facts_name = "facts";
for (x = 1; x != argc; ++x) {
if (argv[x][0] == '-') {
if (!strcmp(argv[x], "--facts") && x + 1 != argc) {
++x;
facts_name = argv[x];
} else if (!strcmp(argv[x], "--trace")) {
trace = 1;
} else if (!strcmp(argv[x], "--swtpc")) {
swtpc = 1;
} else if (!strcmp(argv[x], "--dtrace")) {
trace_disk = 1;
} else if (!strcmp(argv[x], "--mon")) {
stop = 1;
} else if (!strcmp(argv[x], "--skip") && x + 1 != argc) {
++x;
skip = atoi(argv[x]);
} else if (!strcmp(argv[x], "--exbug") && x + 1 != argc) {
exbug_name = argv[++x];
} else if (!strcmp(argv[x], "-x")) {
gotox = 1;
} else if (!strcmp(argv[x], "--lower")) {
lower = 1;
} else {
printf("EXORciser emulator\n");
printf("\n");
printf("exor [options] [disk0 [disk1 [disk2 [disk3]]]]\n");
printf("\n");
printf(" --trace Produce instruction trace on stderr\n");
printf(" --dtrace Produce disk access trace on stderr\n");
printf(" --skip nnn Skip first nnn insns in trace\n");
printf(" --swtpc Simulate SWTPC instead of EXORciser\n");
printf(" --exbug name Give name for ROM if not 'exbug.bin'\n");
printf(" -x Go into EXBUG/SWTBUG instead of MDOS/FLEX\n");
printf(" --facts file Process facts files for commented disassembly\n");
printf(" --lower Allow lowercase\n");
printf(" --mon Start at monitor prompt\n");
printf("\n");
printf("Default disk0 is mdos.dsk/flex.dsk\n");
printf("\n");
printf("Hints:\n");
printf(" To load MDOS from EXBUG, type MAID followed by E800;G\n");
printf("\n");
printf(" To load FLEX2 from SWTBUG, type D\n");
printf("\n");
exit(-1);
}
} else {
if (diskn == 4) {
printf("Only up to four disks allowed\n");
return -1;
} else {
drive[diskn++].name = argv[x];
}
}
}
/* Default disk image name */
if (!drive[0].name)
if (swtpc)
drive[0].name = "flex.dsk";
else
drive[0].name = "mdos.dsk";
/* Default memory image name */
if (!exbug_name) {
if (swtpc) {
exbug_name = "swtbug.bin";
} else {
exbug_name = "exbug.bin";
}
}
/* Load facts file */
if (facts_name) {
FILE *f;