diff --git a/Binary/RCZ180_nat.com b/Binary/RCZ180_nat.com
new file mode 100644
index 00000000..17029f7c
Binary files /dev/null and b/Binary/RCZ180_nat.com differ
diff --git a/Source/HBIOS/cfg_mk4.asm b/Source/HBIOS/cfg_mk4.asm
index a614407f..24c26947 100644
--- a/Source/HBIOS/cfg_mk4.asm
+++ b/Source/HBIOS/cfg_mk4.asm
@@ -81,6 +81,7 @@ UARTSBC		.EQU	FALSE		; UART: AUTO-DETECT SBC/ZETA ONBOARD UART
 UARTCAS		.EQU	TRUE		; UART: AUTO-DETECT ECB CASSETTE UART
 UARTMFP		.EQU	FALSE		; UART: AUTO-DETECT MF/PIC UART
 UART4		.EQU	TRUE		; UART: AUTO-DETECT 4UART UART
+UARTCASSPD	.EQU	SER_300_8N1	; ECB CASSETTE UART DEFAULT SPEED
 ;
 ASCIENABLE	.EQU	TRUE		; ASCI: ENABLE Z180 ASCI SERIAL DRIVER (ASCI.ASM)
 ASCI0CFG	.EQU	DEFSERCFG	; ASCI 0: SERIAL LINE CONFIG
diff --git a/Source/HBIOS/cfg_n8.asm b/Source/HBIOS/cfg_n8.asm
index 22498548..e61adc2d 100644
--- a/Source/HBIOS/cfg_n8.asm
+++ b/Source/HBIOS/cfg_n8.asm
@@ -84,6 +84,7 @@ UARTSBC		.EQU	FALSE		; UART: AUTO-DETECT SBC/ZETA ONBOARD UART
 UARTCAS		.EQU	TRUE		; UART: AUTO-DETECT ECB CASSETTE UART
 UARTMFP		.EQU	FALSE		; UART: AUTO-DETECT MF/PIC UART
 UART4		.EQU	TRUE		; UART: AUTO-DETECT 4UART UART
+UARTCASSPD	.EQU	SER_300_8N1	; ECB CASSETTE UART DEFAULT SPEED
 ;
 ASCIENABLE	.EQU	TRUE		; ASCI: ENABLE Z180 ASCI SERIAL DRIVER (ASCI.ASM)
 ASCI0CFG	.EQU	DEFSERCFG	; ASCI 0: SERIAL LINE CONFIG
diff --git a/Source/HBIOS/cfg_sbc.asm b/Source/HBIOS/cfg_sbc.asm
index 54dcea5e..b2f6bd43 100644
--- a/Source/HBIOS/cfg_sbc.asm
+++ b/Source/HBIOS/cfg_sbc.asm
@@ -75,6 +75,7 @@ UARTSBC		.EQU	TRUE		; UART: AUTO-DETECT SBC/ZETA ONBOARD UART
 UARTCAS		.EQU	TRUE		; UART: AUTO-DETECT ECB CASSETTE UART
 UARTMFP		.EQU	TRUE		; UART: AUTO-DETECT MF/PIC UART
 UART4		.EQU	TRUE		; UART: AUTO-DETECT 4UART UART
+UARTCASSPD	.EQU	SER_300_8N1	; ECB CASSETTE UART DEFAULT SPEED
 ;
 ASCIENABLE	.EQU	FALSE		; ASCI: ENABLE Z180 ASCI SERIAL DRIVER (ASCI.ASM)
 ;
diff --git a/Source/HBIOS/hbios.asm b/Source/HBIOS/hbios.asm
index 6dc70e02..19aa457b 100644
--- a/Source/HBIOS/hbios.asm
+++ b/Source/HBIOS/hbios.asm
@@ -932,12 +932,21 @@ HB_START1:				; BNKCALL ARRIVES HERE, BUT NOW RUNNING IN RAM BANK
 	AND	1			; IS RECOVERY MODE
 	LD	(HB_BOOT_REC),A		; SAVE FOR LATER
     #ENDIF
-    #IF (BT_REC_TYPE == BT_REC_SBC02)
+    #IF (BT_REC_TYPE == BT_REC_SBC1B)
 	IN	A,(RTCIO)		; RTC PORT, BIT 6 HAS THE
 	BIT	6,A			; STATE OF CONFIG JUMPER
 	LD	A,1			; JUMPER INSTALLED 
 	JR	Z,SAVE_REC_M		; IS RECOVERY MODE
 	LD	A,0
+SAVE_REC_M:
+	LD	(HB_BOOT_REC),A		; SAVE FOR LATER
+    #ENDIF
+    #IF (BT_REC_TYPE == BT_REC_SBCRI)
+	IN 	A,($68 + 6)		; UART_MSR MODEM  
+	BIT	6,A			; STATUS REGISTER
+	LD	A,0			; BIT 6 
+	JR	Z,SAVE_REC_M		; IS RECOVERY MODE
+	LD	A,1
 SAVE_REC_M:
 	LD	(HB_BOOT_REC),A		; SAVE FOR LATER
     #ENDIF
diff --git a/Source/HBIOS/prefix.asm b/Source/HBIOS/prefix.asm
index 0916b3ef..0aa2ac2f 100644
--- a/Source/HBIOS/prefix.asm
+++ b/Source/HBIOS/prefix.asm
@@ -207,7 +207,7 @@ PR_LOG_UNIT	.DW	0		; ? (PROBABLY UNUSED)
 ;
 ; SECOND CHUNK OF METADATA 
 ;
-PR_WP		.DB	0		; WRITE PROTECT BOOLEADN
+PR_WP		.DB	0		; WRITE PROTECT BOOLEAN
 PR_UPDSEQ	.DW	0		; PREFIX UPDATE SEQUENCE NUMBER (DEPRECATED?)
 PR_VER		.DB	RMJ,RMN,RUP,RTP	; OS BUILD VERSION
 PR_LABEL	.DB	"Unlabeled Drive ","$"	; DISK LABEL (EXACTLY 16 BYTES!!!)
diff --git a/Source/HBIOS/std.asm b/Source/HBIOS/std.asm
index 4a51624c..c552b5a3 100644
--- a/Source/HBIOS/std.asm
+++ b/Source/HBIOS/std.asm
@@ -79,7 +79,8 @@ BT_AUTO		.EQU	2		; AUTO SELECT BOOT_DEFAULT AFTER BOOT_TIMEOUT
 BT_REC_NONE	.EQU	0		; NO RECOVERY MODE
 BT_REC_FORCE	.EQU	1		; FORCE BOOT RECOVERY MODE
 BT_REC_SBC01	.EQU	2		; ECB-SBCV2 - BIT 1 RTC HIGH
-BT_REC_SBC02	.EQU	3		; ECB-SBCV2 - 1-BIT IO PORT
+BT_REC_SBC1B	.EQU	3		; ECB-SBCV2 - 1-BIT IO PORT
+BT_REC_SBCRI	.EQU	4		; ECB-SBCV2 - 16550 UART RING INDICATOR LINE
 ;
 BT_REC_TYPE	.EQU	BT_REC_NONE	; BOOT RECOVERY METHOD TO USE
 ;
diff --git a/Source/HBIOS/uart.asm b/Source/HBIOS/uart.asm
index b9a72422..d29ccc46 100644
--- a/Source/HBIOS/uart.asm
+++ b/Source/HBIOS/uart.asm
@@ -584,7 +584,7 @@ UART_CFG:
 	.DB	0				; UART TYPE
 	.DB	$80				; IO PORT BASE (RBR, THR)
 	.DB	$80 + UART_LSR			; LINE STATUS PORT (LSR)
-	.DW	SER_300_8N1			; LINE CONFIGURATION
+	.DW	UARTCASSPD			; LINE CONFIGURATION
 	.FILL	2,$FF				; FILLER
 #ENDIF
 #IF (UARTMFP)
diff --git a/Source/HBIOS/uf.asm b/Source/HBIOS/uf.asm
index 4b13ecab..efc3d9b3 100644
--- a/Source/HBIOS/uf.asm
+++ b/Source/HBIOS/uf.asm
@@ -64,7 +64,7 @@ UF_INIT:
 	OR	A			; REQUIRES TERMINAL PROGRAM
 	RET	NZ			; TO HAVE INITIALIZED PORT
 	CALL	PRTSTRD			; ON PC SIDE.
-	.TEXT	"No connection$"
+	.TEXT	" No connection$"
 	RET
 ;
 ; INPUT A CHARACTER AND RETURN IT IN E