diff --git a/main.s65 b/main.s65
index 78edfdc..643a21b 100644
--- a/main.s65
+++ b/main.s65
@@ -1,6 +1,26 @@
 .segment "CODE"
 .include "system/system.h65"
 
+.macro DEBUG_LED_OFF nr
+    lda IO1 + IO_RA
+.if nr = 0
+    and #%11111110
+.else
+    and #%11111101
+.endif
+    sta IO1 + IO_RA
+.endmacro
+
+.macro DEBUG_LED_ON nr
+    lda IO1 + IO_RA
+.if nr = 0
+    ora #%00000001
+.else
+    ora #%00000010
+.endif
+    sta IO1 + IO_RA
+.endmacro
+
 ;********************************************************************************    
 ; Modules
 ;********************************************************************************    
@@ -9,13 +29,17 @@
 LCD_IO = IO1
     .include "lcd.s65"
 ; Keypad Reading
-KP_IO = IO1
+KP_IO = IO2
     .include "keypad.s65"
+; SPI
+SPI_IO = IO1
+    .include "system/spi.s65"
 ; Printer
     .include "printer.s65"
 ; Digital Humidity and Temerature Sensor
     ; .include "dht.s65"
 
+
 ;********************************************************************************    
 ; Interrupts
 ;********************************************************************************    
@@ -24,51 +48,52 @@ nmi:
     jsr _lcd_char
     rti
 irq:
-    ; lda IFR2  todo: verify that the line below does the same thing
+    ; read IRFs, while bit 7 ist set handle interrupts
+    ; Print str_irq
+@irq_io1:
+    ; todo use a reserved address instead of 0
+    lda IO1+IO_IFR
+    sta 0
+    bbr7 0,@irq_io2
+    bbs2 0,@irq_spi_p  ; check SR
+@irq_io2:
     lda IO2+IO_IFR
     sta 0
-    ; todo: decide wether to read keypad or dht
-    ora #%10100000
-    ;  jsr lcd_char  ;TODO: Remove
-    jsr kp_read
-    rti
-    ; bbs1 0,irq_keypad
-    lda #'-'
-    jsr _lcd_char
-    ; bbs4 0,irq_dht
-    ; bbs6 0,irq_dht
-    rti
-irq_keypad:
-    jsr kp_read
-    rti
-irq_dht:
+    bbr7 0,@irq_return
+    bbs4 0,@irq_keypad  ; check CB1
+    ; this should never be reached
+    Print str_irq_unknown
+    ; force reset interrupt flags
+    lda #$ff
+    sta IO1 + IO_IFR
+    sta IO2 + IO_IFR
+    bra @irq_return
+@irq_keypad:
+    jsr kp_read_on_irq
+    bra irq
+@irq_spi_p:
+    jsr spi_p_read
+    bra irq
+@irq_dht:
     lda IO1 + IO_T1CL ;T1L2  ; clear interrupt flag
-    ; jsr dht_irq
+    bra irq
+@irq_return:
     rti
 
 ;********************************************************************************    
 ; Reset sequence
 ;********************************************************************************    
 reset:
-    lda #%11111111
-    sta IO1 + IO_DDRA
-.macro SET_DEBUG_LED_OFF
-    lda #%00000000
-    sta IO1 + IO_RANH
-.endmacro
-.macro SET_DEBUG_LED_ON
-    lda #%11111111
-    sta IO1 + IO_RANH
-.endmacro
-    ; SET_DEBUG_LED_OFF
+    jsr spi_p_init
+
     jsr lcd_init
 
-    ; .repeat 1000
-    ; nop
-    ; .endrepeat
-    ; SET_DEBUG_LED_ON
     jsr kp_init
-    ; SET_DEBUG_LED_OFF
+
+    lda #$ff
+    sta IO1 + IO_DDRA
+    DEBUG_LED_ON 0
+    DEBUG_LED_ON 1
 
     ; ; INIT DHT
     ; lda #%11000010  ; enable interrupt for Timer 1 and CA1 on IO2
@@ -86,21 +111,27 @@ reset:
  
 .proc return_home
     Print message_menu
-; @return_home:
-;     lda menu,x
-;     beq @return_home_done
-;     sta TO_PRINT,x
-;     jsr _lcd_char
-;     inx
-;     bra @return_home
-; @return_home_done:
-;     jsr lcd_print_clear
 .endproc
 
 .proc home
-    ; SET_DEBUG_LED_ON
-    jsr kb_read
+.macro wait
+wait:
+    stz 1
+    stz 2
+    .repeat 2
+    nop
+    .endrepeat
+    inc 1
+    bne wait
+    inc 2
+    bne wait
+.endmacro
+
+    ; jsr rb_keypad_read
+    lda KB_LAST
     beq home
+    stz KB_LAST
+    ; beq home
     cmp #'A'
     jeq printer
     cmp #'B'
@@ -109,20 +140,19 @@ reset:
     jeq print_1
     cmp #'D'
     jeq print_2
+    cmp '4'
+    bra debug
 
     cmp #'*'  ; print home menu again if not visible (message 1 and 2 jmp to home)
-    beq return_home
-
-    ; .repeat 500
-    ; nop
-    ; .endrepeat
-    ; SET_DEBUG_LED_OFF
-    ; .repeat 500
-    ; nop
-    ; .endrepeat
+    jeq return_home
 
     jmp home
 
+debug:
+    DEBUG_LED_OFF 0
+    jmp home
+
+
 .endproc
 
 print_1:
@@ -135,12 +165,20 @@ print_2:
 
 .segment "RODATA"
 message_1: .asciiz "   Powered by   ......6502......      ****      www.quintern.xyz"
-message_2: .asciiz "      Danke        fuer  eure    Aufmerksamkeit        ;)       " 
+message_2:
+    .byte   "   Hallo        "
+    .byte   "     Clara      "
+    .byte   "       <3       "
+    .asciiz "================"
 message_menu: 
     .byte   "<A> Printer     "
     .byte   "<B> Temperatur  "
     .byte   "<C> Text 1      "
     .asciiz "<D> Text 2      "
+str_irq:
+    .asciiz "IRQ detected!   "
+str_irq_unknown:
+    .asciiz "Unknown IRQ src!"
 
 .segment "CODE"
 ;********************************************************************************