Now with CTRL-Q!

I simply changed the ascii Q to extended ascii ctrl-Q, which is 11.

COMMENTS_sector1

@@ -1,32 +1,41 @@
 sector1 (boot sector) will be loaded into memory 7C00 by BIOS
-
 Running in 16-bit x86 Real Mode.
 
 7C00 to 7C08: Main code
 
+Print welcome message
+
 7C00 MOVDX word 7DC0
 7C03 CALL doubleword segment 7D5 offset 0
 
 7C08..7C0F NOP
 
-7C10 XOR byte 11AHAH
+Scan and print; typing.
+
+7C10 XOR (reg to rm) byte 11AHAH
 7C12 INT byte 16
-7C14 CMPAL byte ascii Q
+7C14 CMPAL byte 11 (Ctrl-Q ascii)
 7C16 JZ byte +8 to 7C20
 7C18 MOVAH byte E
 7C1A INT byte 10
 7C1C JMP byte -E to 7C10
 
+Halt the system.
+
 7C20 CLI
 7C21 HLT
 
+To be disposed.
+
+7C30 CLI
+7C31 HLT
+
 7D50 to 7DBF: Procedures code
 
 7D50 to 7D6F: String print code (offset 0)
-
-7D50 XOR byte 11CXCX
-7D52 XOR byte 11BXBX
-7D54 byte 67 MOV byte 00AX100 byte 00CXDX ([DX + CX*1]) (1 = 2^0)
+7D50 XOR (reg to rm) byte 11CXCX
+7D52 XOR (reg to rm) byte 11BXBX
+7D54 byte addr-override 67 MOV byte 00AX100 byte 00CXDX ([DX + CX*1]) (1 = 2^0)
 7D58 CMPAL byte 0
 7D5A JZ byte +7 to 7D62
 7D5C MOVAH byte E