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/*
* PDP-8 format converter.
*
* Usage: p8bin2hex tape.bin > tape.hex
*
* Assumes tape.bin is a SIMH-compatible paper tape image in "BIN" or "RIM"
* formats.
*
* RIM format:
* 10.000.000 leader/trailer (at least an inch of these)
* 01.aaa.aaa address hi (bits 5:0 contain address 11:6)
* 00.aaa.aaa address lo (bits 5:0 contain address 5:0)
* 00.xxx.xxx data hi (bits 5:0 contain data 11:6)
* 00.xxx.xxx data lo (bits 5:0 contain data 5:0)
* <repeat any number of [address, data] pairs>
*
* BIN format:
* 10.000.000 leader/trailer (at least an inch of these)
* 11.011.000 "field" (bits 6:4 specify address 14:12)
* 01.000.010 origin hi bits: bits 5:0 contain origin 11:6
* 00.011.100 origin lo bits: bits 5:0 contain origin 5:0
* 00.xxx.xxx data hi bits: bits 5:0 contain data word 11:6
* 00.xxx.xxx data lo bits: bits 5:0 contain data word 5:0
* <repeat any number of [origin, data+] sequences>
* 00.xxx.xxx chucksum hi - sum of all data and origin frames, but
* 00.xxx.xxx chucksum lo - excluding field and leader/trailer
*
* Some tapes may contain assembler error messages. These are are text
* delimited by 0377 bytes. The BIN loader ignores bytes from starting
* at any 0377 byte, until another 0377 byte is seen.
*/
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
uint16_t mem[32768];
int
load(FILE *fp)
{
enum { Addr, Data, Leader, Fetch, Skip , Start } s = Start;
int c = 0, n, v = 0;
uint16_t a = 0, d = 0, t = 0, u = 0;
for (n = 0; (c = getc(fp)) != EOF; ++n) {
switch (s) {
case Addr:
u += c;
a |= c;
fprintf(stderr, " %04o: address %06o\n", c, a & 077777);
s = Fetch;
break;
case Data:
u += c;
d |= 0x8000 | c;
/* fprintf(stderr, " %04o: data %05o\n", c, d & 07777); */
fprintf(stderr, " %04o", c);
s = Fetch;
break;
case Fetch:
fetch:
if (c == 0200) {
if ((d & 0x8000) != 0) {
if ((d & 07777) != (t & 07777))
fprintf(stderr, "\nbad checksum %05o\n", t & 07777);
else
v = 1, fprintf(stderr, "\nvalid checksum %05o\n", t & 07777);
}
fprintf(stderr, " %04o", c);
goto leadout;
}
t += u;
u = 0;
if (d & 0x8000) {
fprintf(stderr, ": mem[%06o]=%05o\n", a & 077777, d & 07777);
mem[a] = d & 07777;
a = (a & ~07777) | ((a + 1) & 07777);
d = 0;
}
fprintf(stderr, " %04o", c);
if ((c & 0300) == 0000) {
u = c;
d = (c & 077) << 6;
s = Data;
break;
}
if ((c & 0300) == 0100) {
u = c;
a = (a & ~07777) | (c & 077) << 6;
s = Addr;
break;
}
if ((c & 0307) == 0300) {
a = ((c & 0070) << 9) | (a & 07777);
fprintf(stderr, ": field %o address %06o\n", (c & 070) >> 3, a & 077777);
break;
}
if (c == 0377) {
fprintf(stderr, ": skipping: ");
s = Skip;
break;
}
fprintf(stderr, ": unknown byte at %d\n", n);
break;
case Leader:
leader:
if (c != 0200) {
fprintf(stderr, ": end leader\n");
s= Fetch;
goto fetch;
}
fprintf(stderr, " %04o", c);
break;
case Skip:
if (c == 0377) {
s = Fetch;
putchar('\n');
} else {
putchar(c);
}
break;
case Start:
if (c == 0200) {
s = Leader;
goto leader;
}
fprintf(stderr, " %04o", c);
break;
}
}
leadout:
while ((c = getc(fp)) != EOF)
fprintf(stderr, " %04o", c);
putchar('\n');
return v;
}
void
dump()
{
printf("// Generated by p8bin2hex");
unsigned int nextaddr = -1;
for (uint_fast32_t a = 0; a < 32768; ++a) {
if (mem[a] == 0) continue;
if (nextaddr != a)
printf("\n@%x", (unsigned int)a);
nextaddr = a + 1;
printf(" %03x", mem[a]);
}
printf("\n");
}
int
main(int argc, char *argv[])
{
if (argc != 2) {
fprintf(stderr, "usage: p8 filename.bin\n");
exit(EXIT_FAILURE);
}
FILE *fp = fopen(argv[1], "rb");
if (!fp) {
perror(argv[1]);
exit(EXIT_FAILURE);
}
if (!load(fp))
exit(EXIT_FAILURE);
fclose(fp);
dump();
exit(EXIT_SUCCESS);
}
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