remove c cruft

Author: Beej Jorgensen

ls8/README.md

@@ -129,7 +129,8 @@ The number of bytes an instruction uses can be determined from the two high bits
 
 ## Step 4: Implement the `HLT` instruction handler
 
-Add the `HLT` instruction define to `cpu.h`.
+Add the `HLT` instruction definition to `cpu.py` so that you can refer to it by
+name instead of by numeric value.
 
 In `run()` in your switch, exit the loop if a `HLT` instruction is encountered,
 regardless of whether or not there are more lines of code in the LS-8 program
@@ -476,4 +477,4 @@ Doing this correctly requires implementing `CMP`, and some comparative forms of
 
 Hint: Look in the `asm/` directory and learn how to use the `asm.js` assembler.
 This way you can write your code in assembly language and use the assembler to
-build it to machine code and then run it on your emulator.
+build it to machine code and then run it on your emulator.