diff --git a/main.s b/main.s
index 3621363..7cf0769 100644
--- a/main.s
+++ b/main.s
@@ -58,24 +58,4 @@ irq_jump    jmp (irq_vector)
             .addr reset
             .addr irq_jump
 
-; hardware registers
-
-vidx                    = $be00
-vidy                    = $be01
-vidm                    = $be02
-vidd                    = $be03
-
-porta                   = $bf80
-portb                   = $bf81
-ddrb                    = $bf82
-ddra                    = $bf83
-t1cl                    = $bf84
-t1ch                    = $bf85
-acr                     = $bf8b
-ifr                     = $bf8d
-ier                     = $bf8e
-
-keyboard_port           = $bd00
-system_register         = $bc00
-
             .end
\ No newline at end of file
diff --git a/src/variables.s b/src/variables.s
index 4f627f2..3fc1370 100644
--- a/src/variables.s
+++ b/src/variables.s
@@ -44,3 +44,24 @@ color                   = $2fe      ; 8 bit                 Fore & Background Co
 typelength              = $2ff      ; 8 bit                 Length of typebuffer
 typebuffer              = $300      ; 256 byte              256 bit, All Purpose Char Buffer
 
+
+
+; Hardware Registers
+
+vidx                    = $be00     ; 8 bit                 Video X Register
+vidy                    = $be01     ; 8 bit                 Video Y Register
+vidm                    = $be02     ; 8 bit                 Video Modifier Register
+vidd                    = $be03     ; 8 bit                 Video Data Register
+
+porta                   = $bf80     ; 8 bit                 VIA Registers
+portb                   = $bf81     ; 8 bit                 ...
+ddrb                    = $bf82     ; 8 bit
+ddra                    = $bf83     ; 8 bit
+t1cl                    = $bf84     ; 8 bit
+t1ch                    = $bf85     ; 8 bit
+acr                     = $bf8b     ; 8 bit
+ifr                     = $bf8d     ; 8 bit
+ier                     = $bf8e     ; 8 bit
+
+keyboard_port           = $bd00     ; 8 bit                 Keyboard Scan-Row Input
+system_register         = $bc00     ; 8 bit                 System Register
\ No newline at end of file