diff --git a/tools/conv2.c b/tools/conv2.c
new file mode 100644
index 0000000..6b04181
--- /dev/null
+++ b/tools/conv2.c
@@ -0,0 +1,241 @@
+/*
+ * conv2.c
+ *	Tape file converter for simh
+ *
+ * This utility is for converting files to and from the tape format
+ * used by simh.
+ *
+ * 2004 Tim N.
+ * This code is in the public domain.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+int
+testeof(FILE *fp)
+{
+	int ch;
+
+	if(!feof(fp) && (ch = fgetc(fp)) != -1) {
+		ungetc(ch, fp);
+		return 0;
+	}
+	return 1;
+}
+
+void
+xperror(char *msg)
+{
+    perror(msg);
+    exit(1);
+}
+
+FILE *
+xfopen(char *fname, char *mode)
+{
+	FILE *fp = fopen(fname, mode);
+
+	if(!fp)
+		xperror(fname);
+	return fp;
+}
+
+void
+optfclose(FILE *fp)
+{
+	if(fp)
+		fclose(fp);
+}
+
+int
+xreadint(FILE *fp)
+{
+	unsigned char buf[4];
+
+	if(fread(buf, sizeof buf, 1, fp) != 1) {
+		fprintf(stderr, "short read\n");
+		exit(1);
+	}
+	return buf[0] | (buf[1]<<8) | (buf[2]<<16) | (buf[3]<<24);
+}
+
+void
+xwriteint(FILE *fp, int x)
+{
+	unsigned char buf[4];
+
+	buf[0] = x & 0xff;
+	buf[1] = (x>>8) & 0xff;
+	buf[2] = (x>>16) & 0xff;
+	buf[3] = (x>>24) & 0xff;
+	fwrite(buf, sizeof buf, 1, fp);
+}
+
+void
+xcopy(FILE *infp, FILE *outfp, int cnt, int allowshort)
+{
+	char buf[512];
+	int x, r;
+
+	while(cnt > 0) {
+		r = (cnt > sizeof buf) ? sizeof buf : cnt;
+		if((x = fread(buf, 1, r, infp)) != r) {
+			if(x && allowshort) {
+				memset(buf + x, 0, (sizeof buf) - x);
+			} else {
+				fprintf(stderr, "short read\n");
+				exit(1);
+			}
+		}
+		fwrite(buf, 1, r, outfp);
+		cnt -= r;
+	}
+}
+
+int
+convout(FILE *infp, char *fname, int vflag)
+{
+	FILE *outfp = 0;
+	char buf[128], *p;
+	unsigned int l, reclen, i, cnt = 0;
+	int bsize = -1;
+
+	p = strrchr(fname, '.');
+	if(p)
+		l = p - fname;
+	else
+		l = strlen(fname);
+	if(l + 10 > sizeof buf) {
+		fprintf(stderr, "use a smaller name\n");
+		return -1;
+	}
+
+	i = 1;
+	while(!testeof(infp)) {
+		reclen = xreadint(infp);
+		if(reclen == 0x00000000) {
+			if(vflag) {
+				if(cnt)
+					fprintf(stderr, "%s %d@%d -- ", buf, cnt, bsize);
+				fprintf(stderr, "EOF\n");
+			}
+			optfclose(outfp);
+			outfp = 0;
+			cnt = 0;
+
+		} else if(reclen == 0xffffffff) {
+			if(vflag) {
+				if(cnt)
+					fprintf(stderr, "%s %d@%d -- ", buf, cnt, bsize);
+				fprintf(stderr, "EOT\n");
+			}
+			optfclose(outfp);
+			break;
+
+		} else {
+			if(reclen > 0x10000) {
+				/* XXX we dont handle high-bit == error block */
+				fprintf(stderr, "Bad Format?  Got length %d\n", reclen);
+				return -1;
+			}
+			if(cnt && reclen != bsize) {
+				fprintf(stderr, "Expected %d bytes, got %d bytes\n", bsize, reclen);
+				return -1;
+			}
+			cnt ++;
+			bsize = reclen;
+
+			if(!outfp) {
+				sprintf(buf, "%.*s-%d.raw", l, fname, i++);
+				outfp = xfopen(buf, "wb");
+			}
+			xcopy(infp, outfp, reclen, 0);
+			if(xreadint(infp) != reclen) {
+				fprintf(stderr, "format error\n");
+				return -1;
+			}
+		}
+	}
+	return 0;
+}
+
+int
+convin(FILE *ofile, char *fname, int bsize, int vflag)
+{
+	FILE *ifile = xfopen(fname, "rb");
+	int cnt = 0;
+
+	while(!testeof(ifile)) {
+		xwriteint(ofile, bsize);
+		xcopy(ifile, ofile, bsize, 1);
+		xwriteint(ofile, bsize);
+		cnt ++;
+	}
+	xwriteint(ofile, 0); /* EOF */
+	if(vflag)
+		fprintf(stderr, "%s: %d@%d\n", fname, cnt, bsize);
+	return 0;
+}
+
+void
+xusage(char *prog)
+{
+	fprintf(stderr, "usage:  %s [-v] [-i file.tap | -o file.tap file ...]\n"
+				"\tWhen using -o, files may be interspersed with [-b bsize]\n"
+				"\tto specify the block size to use for following files\n"
+				"\tThe default block size is 512.\n", prog);
+	exit(1);
+}
+
+int
+main(int argc, char **argv)
+{
+	FILE *ifile = 0, *ofile = 0;
+	char *prog;
+	int i, ocnt = 0, bsize = 512, vflag = 0;
+	char *ofname = 0, ch;
+
+	prog = argv[0];
+    for(i = 1; i < argc; i++) {
+		if (*argv[i] == '-') {
+			ch = argv[i][1];
+    		if(ch == 'v') 
+        		vflag ++;
+			else if(ch == 'b') {
+				i++;
+				if(!ofile || !argv[i] || !(bsize = atoi(argv[i])))
+					xusage(prog);
+
+			} else if(ch == 'i') {
+				if(ifile || ofile || !argv[++i])
+					xusage(prog);
+				ifile = xfopen(argv[i], "rb");
+				if(convout(ifile, argv[i], vflag) == -1)
+					exit(1);
+
+			} else if(ch == 'o') {
+				if(ifile || ofile || !argv[++i])
+					xusage(prog);
+				ofile = xfopen(argv[i], "wb");
+				ofname = argv[i];
+
+			} else
+				xusage(prog);
+			continue;
+		}
+
+		if(!ofile)
+			xusage(prog);
+		if(convin(ofile, argv[i], bsize, vflag) == -1)
+			exit(1);
+		ocnt ++;
+    }
+	if(ofile)
+		xwriteint(ofile, 0); /*EOF*/ /* 0xffffffff); - EOT */
+
+	return 0;
+}
+
diff --git a/tools/rebuild-split b/tools/rebuild-split
new file mode 100755
index 0000000..5468ed6
--- /dev/null
+++ b/tools/rebuild-split
@@ -0,0 +1,29 @@
+#!/bin/sh
+# rebuild sources in a manner that lets you see the page splits.
+# useful for editing the pages to get the inter-page flow to line
+# up properly.
+
+xcat() { 
+    for fn in $*; do
+        cat $fn
+        echo "******* $fn end *******"
+    done
+}
+
+m() { xcat pages/$2 > rebuilt/$1.s; }
+
+test -d rebuilt || mkdir rebuilt
+
+m u0 e00-*
+#m u1 e01-*
+m u2 e02-*
+#m u3 e03-*
+#m u4 e04-*
+m u5 e05-*
+m u6 e06-*
+m u7 e07-*
+#m u8 e08-*
+m u9 e09-*
+m ux e10-*
+#m sh e11-*
+#m ini e12-*
diff --git a/tools/tap b/tools/tap
new file mode 100755
index 0000000..be6545c
--- /dev/null
+++ b/tools/tap
@@ -0,0 +1,11 @@
+#!/bin/sh
+#
+# build a tape for simh containing the kernel sources
+# requires conv2.c to be built
+
+UNIXDIR=~/work/simh/unix-v7-4/run
+
+tools/rebuild
+(cd rebuilt; gtar -O -cf ../u.tar u?.s)
+tools/conv2 -o tape.tm u.tar
+cp tape.tm $UNIXDIR