additional fixes

asm/io.asm

@@ -1,13 +1,15 @@
+.model small
+
+section .data
+    dt screenMem 16383      ; screen memory address
+    dt screenLen 8192       ; screen memory length
+    dt kbdMem 24575         ; keyboard memory address
+
+section .bss
+    dt kbdIn                ; keyboard input value
+
 section .text
     global main
 
 main:
-
+            ; keyboard current input (16-bit)
-
-section .data
-    dt screenMem 16384      ; screen memory address
-    dt screenLen 8192       ; screen memory length
-    dt kbdMem 24576         ; keyboard memory address
-
-section .bss
-    dt kbdIn                ; keyboard current input (16-bit)

asm/mult.asm

@@ -1,12 +1,12 @@
 .model small
 
-section
-    global main
-
 section .data
     a db 8
     b db 3
 
+section .text
+    global main
+
 main:
     ; initialization
     mov ax, @data

asm/registers.asm

@@ -1,8 +1,4 @@
-section.text
+.model small
-    global main
-
-main:
-
 
 section.data
     ; allocating n.8 16-bit registers
@@ -22,4 +18,7 @@ section.data
     dw THIS 3
     dw THAT 4
 
-; section.bss
+section.text
+    global main
+
+main: