diff --git a/Source/HBIOS/cfg_ezz80.asm b/Source/HBIOS/cfg_ezz80.asm
index 74fd73a2..ebc35644 100644
--- a/Source/HBIOS/cfg_ezz80.asm
+++ b/Source/HBIOS/cfg_ezz80.asm
@@ -225,6 +225,9 @@ HDSKENABLE	.EQU	FALSE		; HDSK: ENABLE SIMH HDSK DISK DRIVER (HDSK.ASM)
 PIOENABLE	.EQU	FALSE		; PIO: ENABLE ZILOG PIO DRIVER (PIO.ASM)
 ;
 LPTENABLE	.EQU	FALSE		; LPT: ENABLE CENTRONICS PRINTER DRIVER (LPT.ASM)
+LPTCNT		.EQU	1		; LPT: NUMBER OF CHIPS TO DETECT (1-2)
+LPT0BASE	.EQU	$E4		; LPT 0: REGISTERS BASE ADR
+LPT1BASE	.EQU	$E8		; LPT 1: REGISTERS BASE ADR
 ;
 PIO_4P		.EQU	FALSE		; PIO: ENABLE PARALLEL PORT DRIVER FOR ECB 4P BOARD
 PIO_ZP		.EQU	FALSE		; PIO: ENABLE PARALLEL PORT DRIVER FOR ECB ZILOG PERIPHERALS BOARD (PIO.ASM)
diff --git a/Source/HBIOS/cfg_mk4.asm b/Source/HBIOS/cfg_mk4.asm
index 46b10312..e642ce5c 100644
--- a/Source/HBIOS/cfg_mk4.asm
+++ b/Source/HBIOS/cfg_mk4.asm
@@ -227,6 +227,9 @@ PIO0BASE	.EQU	$B8		; PIO 0: REGISTERS BASE ADR
 PIO1BASE	.EQU	$BC		; PIO 1: REGISTERS BASE ADR
 ;
 LPTENABLE	.EQU	FALSE		; LPT: ENABLE CENTRONICS PRINTER DRIVER (LPT.ASM)
+LPTCNT		.EQU	1		; LPT: NUMBER OF CHIPS TO DETECT (1-2)
+LPT0BASE	.EQU	$E8		; LPT 0: REGISTERS BASE ADR
+LPT1BASE	.EQU	$EC		; LPT 1: REGISTERS BASE ADR
 ;
 PIO_4P		.EQU	FALSE		; PIO: ENABLE PARALLEL PORT DRIVER FOR ECB 4P BOARD
 PIO4BASE	.EQU	$90		; PIO: PIO REGISTERS BASE ADR FOR ECB 4P BOARD
diff --git a/Source/HBIOS/cfg_rcz80.asm b/Source/HBIOS/cfg_rcz80.asm
index 3fc50fb4..ee0cf84a 100644
--- a/Source/HBIOS/cfg_rcz80.asm
+++ b/Source/HBIOS/cfg_rcz80.asm
@@ -245,6 +245,9 @@ PIO0BASE	.EQU	$B8		; PIO 0: REGISTERS BASE ADR
 PIO1BASE	.EQU	$BC		; PIO 1: REGISTERS BASE ADR
 ;
 LPTENABLE	.EQU	FALSE		; LPT: ENABLE CENTRONICS PRINTER DRIVER (LPT.ASM)
+LPTCNT		.EQU	1		; LPT: NUMBER OF CHIPS TO DETECT (1-2)
+LPT0BASE	.EQU	$E4		; LPT 0: REGISTERS BASE ADR
+LPT1BASE	.EQU	$E8		; LPT 1: REGISTERS BASE ADR
 ;
 PIO_4P		.EQU	FALSE		; PIO: ENABLE PARALLEL PORT DRIVER FOR ECB 4P BOARD
 PIO_ZP		.EQU	FALSE		; PIO: ENABLE PARALLEL PORT DRIVER FOR ECB ZILOG PERIPHERALS BOARD (PIO.ASM)
diff --git a/Source/HBIOS/cfg_sbc.asm b/Source/HBIOS/cfg_sbc.asm
index cc64fff7..f44de4cb 100644
--- a/Source/HBIOS/cfg_sbc.asm
+++ b/Source/HBIOS/cfg_sbc.asm
@@ -225,6 +225,9 @@ PIO0BASE	.EQU	$B8		; PIO 0: REGISTERS BASE ADR
 PIO1BASE	.EQU	$BC		; PIO 1: REGISTERS BASE ADR
 ;
 LPTENABLE	.EQU	FALSE		; LPT: ENABLE CENTRONICS PRINTER DRIVER (LPT.ASM)
+LPTCNT		.EQU	1		; LPT: NUMBER OF CHIPS TO DETECT (1-2)
+LPT0BASE	.EQU	$E8		; LPT 0: REGISTERS BASE ADR
+LPT1BASE	.EQU	$EC		; LPT 1: REGISTERS BASE ADR
 ;
 PIO_4P		.EQU	FALSE		; PIO: ENABLE PARALLEL PORT DRIVER FOR ECB 4P BOARD
 PIO4BASE	.EQU	$90		; PIO: PIO REGISTERS BASE ADR FOR ECB 4P BOARD