minor fix

IO/keyboard.sv

@@ -8,6 +8,7 @@ case(out)
     1 :
         out = 15'b0000000000000001;
         break
+    //TODO: create all keyboard cases
     default:
     0 :
         out = 15'b0000000000000000;

asm/io.asm

@@ -1,9 +1,13 @@
-segment .text
+section .text
     global main
 
 main:
 
 
-segment .data
+section .data
-    dt screen 16384     ; 16-bit screen memory allocation
+    dt screenMem 16384      ; screen memory address
-    dt kbd 24576        ; 16-bit keyboard memory allocation
+    dt screenLen 8192       ; screen memory length
+    dt kbdMem 24576         ; keyboard memory address
+
+section .bss
+    dt kbdIn                ; keyboard current input (16-bit)