Import p8bin2* tools into repo.

1 files changed, 160 insertions, 0 deletions

diff --git a/tool/p8bin2hex.c b/tool/p8bin2hex.c
new file mode 100644
index 0000000..4ef10fc
--- /dev/null
+++ b/tool/p8bin2hex.c
@@ -0,0 +1,160 @@
+/*
+ * 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>
+ *
+ * FIXME: RIM format currently almost always fails with bad checksum
+ *
+ * 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;
+                        s = Fetch;
+                        break;
+                case Data:
+                        u += c;
+                        d |= 0x8000 | 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;
+                                }
+                                goto leadout;
+                        }
+                        t += u;
+                        u = 0;
+                        if (d & 0x8000) {
+                                mem[a] = d & 07777;
+                                a = (a & ~07777) | ((a + 1) & 07777);
+                                d = 0;
+                        }
+                        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);
+                                break;
+                        }
+                        if (c == 0377) {
+                                s = Skip;
+                                break;
+                        }
+                        break;
+                case Leader:
+                leader:
+                        if (c != 0200) {
+                                s= Fetch;
+                                goto fetch;
+                        }
+                        break;
+                case Skip:
+                        if (c == 0377) {
+                                s = Fetch;
+                                putchar('\n');
+                        } else {
+                                putchar(c);
+                        }
+                        break;
+                case Start:
+                        if (c == 0200) {
+                                s = Leader;
+                                goto leader;
+                        }
+                        break;
+                }
+        }
+ leadout:
+        while ((c = getc(fp)) != EOF)
+                ;
+        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);
+}