Committing changes for LCM+L's PDP-7 hardware: removing interrupt code

for nonexistent devices (GRAPHIC II, Dataphone, etc.) and rewriting RB09 disk
code to use our programmed-IO disk device, dubbed the JK09.  This includes
bootstrap code for same.

src/other/jkboot.s

@@ -0,0 +1,37 @@
+" paper tape bootstrap for jk device.
+" reads system into memory at address 0:
+" 4096 words starting at block 14400 (equivalent to track 180 on RB09)
+" (track 180 * 80 segments per track -> 14400)
+" j. dersch 10/21/2019
+
+" JK instructions:
+" jkld - 704624 - loads block address (64 words/block) 
+" jkrd - 704602 - reads next word into AC
+" jkwr - 704604 - writes next word into AC
+
+jkld = 0704624
+jkrd = 0704612
+jkwr = 0704604
+
+" must be output as a "rim" tape for SIMH to boot!!!
+
+" load at normal (user) address of 010000
+   iof				" interrupts off
+   caf				" reset cpu
+
+   lac sblock
+   jkld		" load JK's block address with the kernel's block
+
+wloop:
+   jkrd		" read next word into AC
+   dac i caddr  " stow in memory
+   isz caddr    " move to next word
+   isz wcount
+   jmp wloop    " do the next word
+  
+   " all words read, jump to kernel entrypoint
+   jmp 0100
+    
+caddr: 0
+wcount: -4096 
+sblock: 14400