Use backtick code blocks for syntax highlighting

03-05.md

@@ -82,43 +82,45 @@ and should contain calls to **ZTimerOn** and **ZTimerOff** .
 
 **LISTING 3.2 PZTEST.ASM**
 
-    ; Program to measure performance of code that takes less than
-    ; 54 ms to execute. (PZTEST.ASM)
-    ;
-    ; Link with PZTIMER.ASM (Listing 3.1). PZTEST.BAT (Listing 3.4)
-    ; can be used to assemble and link both files. Code to be
-    ; measured must be in the file TESTCODE; Listing 3.3 shows
-    ; a sample TESTCODE file.
-    ;
-    ; By Michael Abrash
-    ;
-    mystack   segment  para stack ‘STACK'
-          db  512 dup(?)
-    mystack   ends
-    ;
-    Code  segment   para public ‘CODE'
-          assume    cs:Code, ds:Code
-          extrnZTimerOn:near, ZTimerOff:near, ZTimerReport:near
-    Start proc near
-          push cs
-          pop  ds    ; set DS to point to the code segment,
-                     ; so data as well as code can easily
-                     ; be included in TESTCODE
-    ;
-          include    TESTCODE ;code to be measured, including
-                     ; calls to ZTimerOn and ZTimerOff
-    ;
-    ; Display the results.
-    ;
-        call   ZTimerReport
-    ;
-    ; Terminate the program.
-    ;
-           mov   ah,4ch
-           int   21h
-    Start endp
-    Code  ends
-          end  Start
+```nasm
+; Program to measure performance of code that takes less than
+; 54 ms to execute. (PZTEST.ASM)
+;
+; Link with PZTIMER.ASM (Listing 3.1). PZTEST.BAT (Listing 3.4)
+; can be used to assemble and link both files. Code to be
+; measured must be in the file TESTCODE; Listing 3.3 shows
+; a sample TESTCODE file.
+;
+; By Michael Abrash
+;
+mystack   segment  para stack ‘STACK'
+      db  512 dup(?)
+mystack   ends
+;
+Code  segment   para public ‘CODE'
+      assume    cs:Code, ds:Code
+      extrnZTimerOn:near, ZTimerOff:near, ZTimerReport:near
+Start proc near
+      push cs
+      pop  ds    ; set DS to point to the code segment,
+                 ; so data as well as code can easily
+                 ; be included in TESTCODE
+;
+      include    TESTCODE ;code to be measured, including
+                 ; calls to ZTimerOn and ZTimerOff
+;
+; Display the results.
+;
+    call   ZTimerReport
+;
+; Terminate the program.
+;
+       mov   ah,4ch
+       int   21h
+Start endp
+Code  ends
+      end  Start
+```
 
 Listing 3.3 shows some sample code to be timed. This listing measures
 the time required to execute 1,000 loads of AL from the memory variable
@@ -130,30 +132,32 @@ after the code in Listing 3.3 has been run.
 
 **LISTING 3.3 LST3-3.ASM**
 
-    ; Test file;
-    ; Measures the performance of 1,000 loads of AL from
-    ; memory. (Use by renaming to TESTCODE, which is
-    ; included by PZTEST.ASM (Listing 3.2). PZTIME.BAT
-    ; (Listing 3.4) does this, along with all assembly
-    ; and linking.)
-    ;
-    jmp   Skip     ;jump around defined data
-    ;
-    MemVar db      ?
-    ;
-    Skip:
-    ;
-    ; Start timing.
-    ;
-          call  ZTimerOn
-    ;
-          rept  1000
-          mov al,[MemVar]
-          endm
-    ;
-    ; Stop timing.
-    ;
-        call  ZTimerOff
+```nasm
+; Test file;
+; Measures the performance of 1,000 loads of AL from
+; memory. (Use by renaming to TESTCODE, which is
+; included by PZTEST.ASM (Listing 3.2). PZTIME.BAT
+; (Listing 3.4) does this, along with all assembly
+; and linking.)
+;
+jmp   Skip     ;jump around defined data
+;
+MemVar db      ?
+;
+Skip:
+;
+; Start timing.
+;
+      call  ZTimerOn
+;
+      rept  1000
+      mov al,[MemVar]
+      endm
+;
+; Stop timing.
+;
+    call  ZTimerOff
+```
 
 It's worth noting that Listing 3.3 begins by jumping around the memory
 variable **MemVar**. This approach lets us avoid reproducing Listing 3.2