diff --git a/Source/HBIOS/Config/RC_ez80.asm b/Source/HBIOS/Config/RC_ezz80.asm
similarity index 88%
rename from Source/HBIOS/Config/RC_ez80.asm
rename to Source/HBIOS/Config/RC_ezz80.asm
index 895b9075..32d9ab11 100644
--- a/Source/HBIOS/Config/RC_ez80.asm
+++ b/Source/HBIOS/Config/RC_ezz80.asm
@@ -10,7 +10,7 @@ DEFSIOCLK	.SET	1843200		; SIO CLOCK FREQ
 DEFSERCFG	.SET	SER_115200_8N1	; DEFAULT SERIAL LINE CONFIG (SHOULD MATCH ABOVE)
 ;
 SIOENABLE	.SET	TRUE		; TRUE TO AUTO-DETECT ZILOG SIO/2 
-SIOMODE		.SET	SIOMODE_EZ80	; TYPE OF SIO/2 TO DETECT: SIOMODE_RC, SIOMODE_SMB, SIOMODE_EZ80
+SIOMODE		.SET	SIOMODE_EZZ80	; TYPE OF SIO/2 TO DETECT: SIOMODE_RC, SIOMODE_SMB, SIOMODE_EZZ80
 ACIAENABLE	.SET	FALSE		; TRUE TO AUTO-DETECT MOTOROLA 6850 ACIA
 ;
 FDENABLE	.SET	FALSE		; TRUE FOR FLOPPY SUPPORT
diff --git a/Source/HBIOS/sio.asm b/Source/HBIOS/sio.asm
index 02a0ddd9..2f0ef922 100644
--- a/Source/HBIOS/sio.asm
+++ b/Source/HBIOS/sio.asm
@@ -40,7 +40,7 @@ SIOB_CMD	.EQU	SIOBASE + $07
 SIOB_DAT	.EQU	SIOBASE + $05
 #ENDIF
 ;
-#IF (SIOMODE == SIOMODE_EZ80)
+#IF (SIOMODE == SIOMODE_EZZ80)
 SIOA_CMD	.EQU	SIOBASE + $01	
 SIOA_DAT	.EQU	SIOBASE + $00
 SIOB_CMD	.EQU	SIOBASE + $03
@@ -284,7 +284,7 @@ SIO_IN:
 	DEC	C			; DECREMENT CMD PORT TWICE TO GET DATA PORT
 	DEC	C
 #ENDIF
-#IF (SIOMODE == SIOMODE_EZ80)
+#IF (SIOMODE == SIOMODE_EZZ80)
 	DEC	C			; DECREMENT CMD PORT TO GET DATA PORT
 #ENDIF
 	IN	E,(C)			; GET CHAR
@@ -371,7 +371,7 @@ SIO_OUT:
 	DEC	C			; DECREMENT CMD PORT TWICE TO GET DATA PORT
 	DEC	C
 #ENDIF
-#IF (SIOMODE == SIOMODE_EZ80)
+#IF (SIOMODE == SIOMODE_EZZ80)
 	DEC	C			; DECREMENT CMD PORT TO GET DATA PORT
 #ENDIF
 	OUT	(C),E			; SEND CHAR FROM E
diff --git a/Source/HBIOS/std.asm b/Source/HBIOS/std.asm
index 9287f195..138419c6 100644
--- a/Source/HBIOS/std.asm
+++ b/Source/HBIOS/std.asm
@@ -78,7 +78,7 @@ SIOMODE_NONE	.EQU	0
 SIOMODE_RC	.EQU	1		; RC2014 SIO MODULE (SPENCER OWEN)
 SIOMODE_SMB	.EQU	2		; RC2014 SIO MODULE (SCOTT BAKER)
 SIOMODE_ZP	.EQU	3		; ECB-ZILOG PERIPHERALS BOARD
-SIOMODE_EZ80	.EQU	4		; EASY Z80 ON-BOARD SIO/0
+SIOMODE_EZZ80	.EQU	4		; EASY Z80 ON-BOARD SIO/0
 ;
 ; PIO MODE SELECTIONS
 ;