diff --git a/avr/com2_lowlevel.asm b/avr/com2_lowlevel.asm
index 78e0f87..f08cc32 100644
--- a/avr/com2_lowlevel.asm
+++ b/avr/com2_lowlevel.asm
@@ -185,10 +185,40 @@ com2WaitForAttnHigh_done:
   ret
 
 
+
 ; ---------------------------------------------------------------------------
-; comWaitFor100ns
+; com2WaitForDataState1ms
 ;
-; Waits for 100 nanoseconds.
+; Waits up to COM2_MAXWAIT_US loops for high ATTN line
+; IN:
+; OUT:
+; - CFLAG: set if state reached, cleared otherwise
+; REGS: R24 (R22)
+
+com2WaitForDataState1ms:
+  ldi r24, 100
+com2WaitForDataState1ms_loop:
+    push r17
+      in r17, COM_PIN_DATA
+      eor r17, r16
+      andi r17, (1<<COM_PINNUM_DATA)
+    pop r17
+    breq com2WaitForDataState1ms_stateReached
+    Utils_WaitNanoSecs 10000, 0, r22              ; wait for 10us
+    dec r24
+  brne com2WaitForDataState1ms_loop
+  clc
+  ret
+com2WaitForDataState1ms_stateReached:
+  sec
+  ret
+
+
+
+; ---------------------------------------------------------------------------
+; comWaitFor1000ns
+;
+; Waits for 1000 nanoseconds.
 ; IN:
 ; OUT:
 ; - CFLAG: set if okay, clear otherwise