diff --git a/Source/HBIOS/cfg_duo.asm b/Source/HBIOS/cfg_duo.asm
index afc62ad0..0d6cdcbb 100644
--- a/Source/HBIOS/cfg_duo.asm
+++ b/Source/HBIOS/cfg_duo.asm
@@ -254,10 +254,10 @@ ESPCONENABLE	.EQU	TRUE		; ESP: ENABLE ESP32 CONSOLE IO DRIVER VIDEO/KBD SUPPORT
 HDSKENABLE	.EQU	FALSE		; HDSK: ENABLE SIMH HDSK DISK DRIVER (HDSK.ASM)
 HDSKTRACE	.EQU	1		; HDSK: TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
 ;
-PIOENABLE	.EQU	FALSE		; PIO: ENABLE ZILOG PIO DRIVER (PIO.ASM)
+PIOENABLE	.EQU	TRUE		; PIO: ENABLE ZILOG PIO DRIVER (PIO.ASM)
 PIOCNT		.EQU	2		; PIO: NUMBER OF CHIPS TO DETECT (1-2), 2 CHANNELS PER CHIP
-PIO0BASE	.EQU	$B8		; PIO 0: REGISTERS BASE ADR
-PIO1BASE	.EQU	$BC		; PIO 1: REGISTERS BASE ADR
+PIO0BASE	.EQU	$68		; PIO 0: REGISTERS BASE ADR
+PIO1BASE	.EQU	$6C		; PIO 1: REGISTERS BASE ADR
 ;
 LPTENABLE	.EQU	FALSE		; LPT: ENABLE CENTRONICS PRINTER DRIVER (LPT.ASM)
 LPTMODE		.EQU	LPTMODE_SPP	; LPT: DRIVER MODE: LPTMODE_[NONE|SPP|MG014]