Update acia.asm

Updated ACIA detection to use primary ACIA port instead of phantom port.

Source/HBIOS/acia.asm

@@ -576,15 +576,8 @@ ACIA_DEVICE:
 ;
 ; ACIA DETECTION ROUTINE
 ;
-; NOTE THAT THE ACIA MODULES ONLY QUALIFY ADDRESS BITS 7 & 6, SO
-; THE ACIA'S TWO PORTS APPEAR REPEATEDLY OVER AN ADDRESS RANGE
-; OF $40 STARTING FROM THE REAL BASE PORT.
-; WE TAKE ADVANTAGE OF THIS TO AVOID CONFLICTING WITH SIO
-; AND COMPACT FLASH MODULES DURING DETECTION PROBES.
-;
 ACIA_DETECT:
 	LD	A,(IY+3)		; BASE PORT ADDRESS
-	ADD	A,$18			; OFFSET (SEE ABOVE)
 	LD	C,A			; PUT IN C FOR I/O
         CALL    ACIA_DETECT2            ; CHECK IT
         JR      Z,ACIA_DETECT1          ; FOUND IT, RECORD IT