diff --git a/avr/modules/flash/io_uart0.asm b/avr/modules/flash/io_uart0.asm
new file mode 100644
index 0000000..8934246
--- /dev/null
+++ b/avr/modules/flash/io_uart0.asm
@@ -0,0 +1,31 @@
+; ***************************************************************************
+; copyright   : (C) 2025 by Martin Preuss
+; email       : martin@libchipcard.de
+;
+; ***************************************************************************
+; * This file is part of the project "AqHome".                              *
+; * Please see toplevel file COPYING of that project for license details.   *
+; ***************************************************************************
+
+
+
+.equ  UART_REG_UDR   = UDR0
+.equ  UART_REG_UCSRA = UCSR0A
+.equ  UART_REG_UCSRB = UCSR0B
+.equ  UART_REG_UCSRC = UCSR0C
+.equ  UART_REG_UBRRL = UBRR0L
+.equ  UART_REG_UBRRH = UBRR0H
+
+.equ  UART_BIT_UCSZ0 = UCSZ00
+.equ  UART_BIT_UDRE  = UDRE0
+.equ  UART_BIT_RXC   = RXC0
+.equ  UART_BIT_TXC   = TXC0
+.equ  UART_BIT_FE    = FE0
+.equ  UART_BIT_DOR   = DOR0
+.equ  UART_BIT_UPE   = UPE0
+.equ  UART_BIT_RXEN  = RXEN0
+.equ  UART_BIT_TXEN  = TXEN0
+
+
+
+
diff --git a/avr/modules/flash/io_uart_all.asm b/avr/modules/flash/io_uart_all.asm
index 118d900..e772ba5 100644
--- a/avr/modules/flash/io_uart_all.asm
+++ b/avr/modules/flash/io_uart_all.asm
@@ -46,13 +46,6 @@ ioRawInit:
   ori r16, (1<<UART_BIT_RXEN) | (1<<UART_BIT_TXEN)   ; enable transmit and receive
   sts UART_REG_UCSRB, r16
 
-.ifdef COM_ATTN_PUE
-    lds r16, COM_ATTN_PUE
-    cbr r16, COM_ATTN_PIN             ; disable pullup on ATTN
-    sts COM_ATTN_PUE, r16
-.else
-    cbi COM_ATTN_OUTPUT, COM_ATTN_PIN ; disable internal pullup for ATTN
-
 .endif
 
   ret