Use backtick code blocks for syntax highlighting

03-10.md

@@ -16,11 +16,13 @@ doesn't occur, and the linker can find the routines' C-style names.)
 That's all it takes; after doing this, you'll be able to use the Zen
 timer from C, as, for example, in:
 
-    ZTimerOn():
-    for (i=0, x=0; i<100; i++)
-         x += i;
-    ZTimerOff();
-    ZTimerReport();
+```c
+ZTimerOn():
+for (i=0, x=0; i<100; i++)
+     x += i;
+ZTimerOff();
+ZTimerReport();
+```
 
 (I'm talking about the precision timer here. The long-period
 timer—Listing 3.5—requires the same modifications, but to different
@@ -46,12 +48,16 @@ One important safety tip when modifying the Zen timer for use with large
 code model C code: Watch out for optimizing assemblers! TASM actually
 replaces
 
-    call     far ptr ReferenceZTimerOn
+```nasm
+call     far ptr ReferenceZTimerOn
+```
 
 with
 
-    push     cs
-    call     near ptr ReferenceZTimerOn
+```nasm
+push     cs
+call     near ptr ReferenceZTimerOn
+```
 
 (and likewise for **ReferenceZTimerOff** ), which works because
 **ReferenceZTimerOn** is in the same segment as the calling code. This