diff --git a/main.s65 b/main.s65
index bde877d..aa50cfd 100644
--- a/main.s65
+++ b/main.s65
@@ -44,24 +44,25 @@ SPI_IO = IO2
 ;********************************************************************************    
 ; Interrupts
 ;********************************************************************************    
+.zeropage
+IRQ_VAR:    .res 1
 .code
 nmi:
     lda #'%'
     jsr lcd_char
     rti
 irq:
-IRQ_VAR = 0
     ; read IRFs, while bit 7 ist set handle interrupts
-@irq_io1:
-    lda SPI_IO+IO::IFR
-    sta IRQ_VAR
-    bbr7 IRQ_VAR,@irq_io2
-    bbs2 IRQ_VAR,@irq_spi_p  ; check SR
+; @irq_io1:
+;     lda SPI_IO+IO::IFR
+;     sta IRQ_VAR
+    ; bbr7 IRQ_VAR,@irq_io2
 @irq_io2:
-    ; lda IO2+IO::IFR
-    ; sta IRQ_VAR
-    ; bbr7 IRQ_VAR,@irq_return
-    ; bbs4 IRQ_VAR,@irq_keypad  ; check CB1
+    lda IO2+IO::IFR
+    sta IRQ_VAR
+    bbr7 IRQ_VAR,@irq_return
+    bbs1 IRQ_VAR,@irq_keypad  ; check CB1
+    bbs2 IRQ_VAR,@irq_spi_p  ; check SR
     ; this should never be reached
     jsr lcd_clear
     Print str_irq_unknown
@@ -76,9 +77,9 @@ IRQ_VAR = 0
 @irq_spi_p:
     jsr spi_p_read
     bra @irq_return
-@irq_dht:
-    lda IO1 + IO::T1CL ;T1L2  ; clear interrupt flag
-    bra @irq_return
+; @irq_dht:
+;     lda IO1 + IO::T1CL ;T1L2  ; clear interrupt flag
+;     bra @irq_return
 @irq_return:
     rti
 
@@ -88,15 +89,16 @@ IRQ_VAR = 0
 reset:
     jsr lcd_init
 
-    ; jsr kp_init
-
-    jsr spi_p_init
-
     lda #$ff
     sta IO1 + IO::DDRA
     DEBUG_LED_OFF 0
     DEBUG_LED_OFF 1
 
+    jsr kp_init
+
+    jsr spi_p_init
+
+
     ; ; INIT DHT
     ; lda #%11000010  ; enable interrupt for Timer 1 and CA1 on IO2
     ; sta IER2
@@ -128,7 +130,26 @@ reset:
     jeq print_1
     cmp #'D'
     jeq print_2
-
+    cmp #'0'
+    bne @l1
+    DEBUG_LED_OFF 0
+    jmp home
+@l1:
+    cmp #'#'
+    bne @l2
+    DEBUG_LED_ON 0
+    jmp home
+@l2:
+    cmp #'8'
+    bne @l3
+    DEBUG_LED_OFF 1
+    jmp home
+@l3:
+    cmp #'9'
+    bne @l4
+    DEBUG_LED_ON 1
+    jmp home
+@l4:
     cmp #'*'  ; print home menu again if not visible (message 1 and 2 jmp to home)
     jeq return_home
 
@@ -147,7 +168,11 @@ print_2:
     jmp home
 
 .rodata
-message_1: .asciiz "   Powered by   ......6502......      ****      www.quintern.xyz"
+message_1:
+    .byte   "   Powered by   "
+    .byte   "......6502......"
+    .byte   "      ****      "
+    .asciiz "www.quintern.xyz"
 message_2:
     .byte   "   Hello        "
     .byte   "     there      "
diff --git a/system/keypad.s65 b/system/keypad.s65
index ea9d628..42107ee 100644
--- a/system/keypad.s65
+++ b/system/keypad.s65
@@ -4,7 +4,7 @@
 ; @device 4x4 Matrix Keypad
 ; @details
 ;   The LCD must be connected to a W65C22N Interface Chip:
-;     - IO.RB0-7  -> 
+;     - IO.RA0-7  -> 
 ; @requires KP_IO: Base Address of IO Chip
 ; @depends IO-W65C22N 
 ;********************************************************************************
@@ -30,22 +30,23 @@ RBUF_MEM_END = RBUF_MEM_START + KP_BUF_SIZE - 1
 .proc kp_init
     ; todo remove later and test
     lda #$ff
-    sta KP_IO+IO::DDRB
-    stz KP_IO+IO::RB
+    sta KP_IO+IO::DDRA
+    stz KP_IO+IO::RA
 
     ; INIT KEYPAD 
     ; todo: use masks
-    lda #%00001111; KP_IO+IO::RB 0-3 output
-    sta KP_IO+IO::DDRB
-    stz KP_IO+IO::RB        ; KP_IO+IO::RB 4-7 1 so keypad press can be detected
+    lda #%11110000; KP_IO+IO::RA 0-3 output
+    sta KP_IO+IO::DDRA
+    ; output 0, key press will pull input pin low
+    stz KP_IO+IO::RA        
     stz KP_IO+IO::ACR
 
-    ; lda #%00010000  ; set CB1 to interrupt on pos. edge
+    ; lda #%00010000  ; set CA1 to interrupt on pos. edge
     ; todo: use masks
-    lda #IO::PCR::CB1_IP_AE
+    lda #IO::PCR::CA1_IP_AE
     sta KP_IO+IO::PCR
     jsr rb_keypad_init  ; init keybuffer
-    lda #(IO::IRQ::IRQ | IO::IRQ::CB1)  ; enable interrupt for CB1 on KP_IO
+    lda #(IO::IRQ::IRQ | IO::IRQ::CA1)  ; enable interrupt for CA1 on KP_IO
     sta KP_IO+IO::IER
     rts
 .endproc
@@ -60,23 +61,24 @@ RBUF_MEM_END = RBUF_MEM_START + KP_BUF_SIZE - 1
 .proc kp_read_on_irq
     ; test each "row" and check which column is 1
     ; todo dont check every column if the value has been found
-    lda #%00001110
+    lda #%11100000
     ldx #$00
     jsr @kp_read_column
-    lda #%00001101
+    lda #%11010000
     ldx #$08
     jsr @kp_read_column
-    lda #%00001011
+    lda #%10110000
     ldx #$04
     jsr @kp_read_column
-    lda #%00000111
+    lda #%01110000
     ldx #$0c
     jsr @kp_read_column
-    stz KP_IO+IO::RB  ; todo why all zero?
+    stz KP_IO+IO::RA
+    lda KP_IO+IO::RA  ; todo: verify that this is necessary so that rows 1-3 dont refire immediately after they are armed again because of stz
     rts
 @kp_read_column:
-    sta KP_IO+IO::RB
-    lda KP_IO+IO::RB
+    sta KP_IO+IO::RA
+    lda KP_IO+IO::RA
     sta _KP_COLUMN  ; store result in zeropage so that bbr can be used
     bbr4 _KP_COLUMN,@kp_write
     inx