start of a paper tape bootstrap to read system from disk

src/other/pbboot.s

@@ -0,0 +1,33 @@
+" paper tape bootstrap: reads system from track 180
+" (could read from any track 180-189 based on switches?)
+" phil budne 3/24/2016
+
+" must be output as a "rim" tape for SIMH to boot!!!
+
+" load at normal (user) address of 010000
+   iof				" interrupts off
+   caf				" reset cpu
+   dscs				" clear disk status
+
+" code from maksys (altered to read instead of write):
+   -3072; dslw
+   cla; dslm
+   lac track; alss 8; xor o300000; dsld
+   lac o2000; dsls
+   dssf; jmp .-1
+   dsrs; spa; hlt
+
+   -1024; dslw
+   lac d3072; dslm
+   lac track; alss 8; xor o300110; dsld
+   lac o2000; dsls
+   dssf; jmp .-1
+   dsrs; spa; hlt
+
+   jmp 0100
+
+o2000: 02000
+d3072: 3072
+o300000: 0300000
+o300110: 0300110
+track: 0		" get 0-9 from switches!!!