diff --git a/Doc/ChangeLog.txt b/Doc/ChangeLog.txt
index 610fb134..b19ad88f 100644
--- a/Doc/ChangeLog.txt
+++ b/Doc/ChangeLog.txt
@@ -13,6 +13,7 @@ Version 2.9.2
 - WBW: Config files cleanup
 - WBW: Add interrupt support to ASCI driver
 - WBW: Refactored XModem overlay, merged USB-FIFO support
+- PMS: Added DS1210 low battery detection/message
 
 Version 2.9.1
 -------------
diff --git a/Source/HBIOS/cfg_ezz80.asm b/Source/HBIOS/cfg_ezz80.asm
index 19a5f2ea..3394a650 100644
--- a/Source/HBIOS/cfg_ezz80.asm
+++ b/Source/HBIOS/cfg_ezz80.asm
@@ -16,6 +16,7 @@
 PLATFORM	.EQU	PLT_EZZ80	; PLT_[SBC|ZETA|ZETA2|N8|MK4|UNA|RCZ80|RCZ180|EZZ80|SC126]
 CPUFAM		.EQU	CPU_Z80		; CPU FAMILY: CPU_[Z80|Z180]
 BIOS		.EQU	BIOS_WBW	; HARDWARE BIOS: BIOS_[WBW|UNA]
+BATCOND		.EQU	FALSE		; ENABLE LOW BATTERY WARNING MESSAGE
 ;
 BOOTTYPE	.EQU	BT_MENU		; BT_[MENU|AUTO], IF AUTO, BOOT DEFAULT AFTER TIMEOUT
 BOOT_TIMEOUT	.EQU	20		; AUTO BOOT TIMEOUT IN SECONDS, 0 FOR IMMEDIATE BOOT
diff --git a/Source/HBIOS/cfg_master.asm b/Source/HBIOS/cfg_master.asm
index 1b30e678..ea95fd58 100644
--- a/Source/HBIOS/cfg_master.asm
+++ b/Source/HBIOS/cfg_master.asm
@@ -13,6 +13,7 @@
 PLATFORM	.EQU	PLT_SBC		; PLT_[SBC|ZETA|ZETA2|N8|MK4|UNA|RCZ80|RCZ180|EZZ80|SC126]
 CPUFAM		.EQU	CPU_Z80		; CPU FAMILY: CPU_[Z80|Z180]
 BIOS		.EQU	BIOS_WBW	; HARDWARE BIOS: BIOS_[WBW|UNA]
+BATCOND		.EQU	FALSE		; ENABLE LOW BATTERY WARNING MESSAGE
 ;
 BOOTTYPE	.EQU	BT_MENU		; BT_[MENU|AUTO], IF AUTO, BOOT DEFAULT AFTER TIMEOUT
 BOOT_TIMEOUT	.EQU	20		; AUTO BOOT TIMEOUT IN SECONDS, 0 FOR IMMEDIATE BOOT
diff --git a/Source/HBIOS/cfg_mk4.asm b/Source/HBIOS/cfg_mk4.asm
index b371a112..707945a2 100644
--- a/Source/HBIOS/cfg_mk4.asm
+++ b/Source/HBIOS/cfg_mk4.asm
@@ -16,6 +16,7 @@
 PLATFORM	.EQU	PLT_MK4		; PLT_[SBC|ZETA|ZETA2|N8|MK4|UNA|RCZ80|RCZ180|EZZ80|SC126]
 CPUFAM		.EQU	CPU_Z180	; CPU FAMILY: CPU_[Z80|Z180]
 BIOS		.EQU	BIOS_WBW	; HARDWARE BIOS: BIOS_[WBW|UNA]
+BATCOND		.EQU	FALSE		; ENABLE LOW BATTERY WARNING MESSAGE
 ;
 BOOTTYPE	.EQU	BT_MENU		; BT_[MENU|AUTO], IF AUTO, BOOT DEFAULT AFTER TIMEOUT
 BOOT_TIMEOUT	.EQU	20		; AUTO BOOT TIMEOUT IN SECONDS, 0 FOR IMMEDIATE BOOT
diff --git a/Source/HBIOS/cfg_n8.asm b/Source/HBIOS/cfg_n8.asm
index 86fab36f..c2146a68 100644
--- a/Source/HBIOS/cfg_n8.asm
+++ b/Source/HBIOS/cfg_n8.asm
@@ -16,6 +16,7 @@
 PLATFORM	.EQU	PLT_N8		; PLT_[SBC|ZETA|ZETA2|N8|MK4|UNA|RCZ80|RCZ180|EZZ80|SC126]
 CPUFAM		.EQU	CPU_Z180	; CPU FAMILY: CPU_[Z80|Z180]
 BIOS		.EQU	BIOS_WBW	; HARDWARE BIOS: BIOS_[WBW|UNA]
+BATCOND		.EQU	FALSE		; ENABLE LOW BATTERY WARNING MESSAGE
 ;
 BOOTTYPE	.EQU	BT_MENU		; BT_[MENU|AUTO], IF AUTO, BOOT DEFAULT AFTER TIMEOUT
 BOOT_TIMEOUT	.EQU	20		; AUTO BOOT TIMEOUT IN SECONDS, 0 FOR IMMEDIATE BOOT
diff --git a/Source/HBIOS/cfg_rcz180.asm b/Source/HBIOS/cfg_rcz180.asm
index 904c7691..4bed397a 100644
--- a/Source/HBIOS/cfg_rcz180.asm
+++ b/Source/HBIOS/cfg_rcz180.asm
@@ -16,6 +16,7 @@
 PLATFORM	.EQU	PLT_RCZ180	; PLT_[SBC|ZETA|ZETA2|N8|MK4|UNA|RCZ80|RCZ180|EZZ80|SC126]
 CPUFAM		.EQU	CPU_Z180	; CPU FAMILY: CPU_[Z80|Z180]
 BIOS		.EQU	BIOS_WBW	; HARDWARE BIOS: BIOS_[WBW|UNA]
+BATCOND		.EQU	FALSE		; ENABLE LOW BATTERY WARNING MESSAGE
 ;
 BOOTTYPE	.EQU	BT_MENU		; BT_[MENU|AUTO], IF AUTO, BOOT DEFAULT AFTER TIMEOUT
 BOOT_TIMEOUT	.EQU	20		; AUTO BOOT TIMEOUT IN SECONDS, 0 FOR IMMEDIATE BOOT
diff --git a/Source/HBIOS/cfg_rcz80.asm b/Source/HBIOS/cfg_rcz80.asm
index 4104062a..d6a947fc 100644
--- a/Source/HBIOS/cfg_rcz80.asm
+++ b/Source/HBIOS/cfg_rcz80.asm
@@ -16,6 +16,7 @@
 PLATFORM	.EQU	PLT_RCZ80	; PLT_[SBC|ZETA|ZETA2|N8|MK4|UNA|RCZ80|RCZ180|EZZ80|SC126]
 CPUFAM		.EQU	CPU_Z80		; CPU FAMILY: CPU_[Z80|Z180]
 BIOS		.EQU	BIOS_WBW	; HARDWARE BIOS: BIOS_[WBW|UNA]
+BATCOND		.EQU	FALSE		; ENABLE LOW BATTERY WARNING MESSAGE
 ;
 BOOTTYPE	.EQU	BT_MENU		; BT_[MENU|AUTO], IF AUTO, BOOT DEFAULT AFTER TIMEOUT
 BOOT_TIMEOUT	.EQU	20		; AUTO BOOT TIMEOUT IN SECONDS, 0 FOR IMMEDIATE BOOT
diff --git a/Source/HBIOS/cfg_sbc.asm b/Source/HBIOS/cfg_sbc.asm
index 34fff224..f63fa549 100644
--- a/Source/HBIOS/cfg_sbc.asm
+++ b/Source/HBIOS/cfg_sbc.asm
@@ -16,6 +16,7 @@
 PLATFORM	.EQU	PLT_SBC		; PLT_[SBC|ZETA|ZETA2|N8|MK4|UNA|RCZ80|RCZ180|EZZ80|SC126]
 CPUFAM		.EQU	CPU_Z80		; CPU FAMILY: CPU_[Z80|Z180]
 BIOS		.EQU	BIOS_WBW	; HARDWARE BIOS: BIOS_[WBW|UNA]
+BATCOND		.EQU	FALSE		; ENABLE LOW BATTERY WARNING MESSAGE
 ;
 BOOTTYPE	.EQU	BT_MENU		; BT_[MENU|AUTO], IF AUTO, BOOT DEFAULT AFTER TIMEOUT
 BOOT_TIMEOUT	.EQU	20		; AUTO BOOT TIMEOUT IN SECONDS, 0 FOR IMMEDIATE BOOT
diff --git a/Source/HBIOS/cfg_sc126.asm b/Source/HBIOS/cfg_sc126.asm
index d897fcda..ab25a854 100644
--- a/Source/HBIOS/cfg_sc126.asm
+++ b/Source/HBIOS/cfg_sc126.asm
@@ -16,6 +16,7 @@
 PLATFORM	.EQU	PLT_SC126	; PLT_[SBC|ZETA|ZETA2|N8|MK4|UNA|RCZ80|RCZ180|EZZ80|SC126]
 CPUFAM		.EQU	CPU_Z180	; CPU FAMILY: CPU_[Z80|Z180]
 BIOS		.EQU	BIOS_WBW	; HARDWARE BIOS: BIOS_[WBW|UNA]
+BATCOND		.EQU	FALSE		; ENABLE LOW BATTERY WARNING MESSAGE
 ;
 BOOTTYPE	.EQU	BT_MENU		; BT_[MENU|AUTO], IF AUTO, BOOT DEFAULT AFTER TIMEOUT
 BOOT_TIMEOUT	.EQU	20		; AUTO BOOT TIMEOUT IN SECONDS, 0 FOR IMMEDIATE BOOT
diff --git a/Source/HBIOS/cfg_zeta.asm b/Source/HBIOS/cfg_zeta.asm
index 21fb1f22..a111bafd 100644
--- a/Source/HBIOS/cfg_zeta.asm
+++ b/Source/HBIOS/cfg_zeta.asm
@@ -16,6 +16,7 @@
 PLATFORM	.EQU	PLT_ZETA	; PLT_[SBC|ZETA|ZETA2|N8|MK4|UNA|RCZ80|RCZ180|EZZ80|SC126]
 CPUFAM		.EQU	CPU_Z80		; CPU_[Z80|Z180]: CPU FAMILY
 BIOS		.EQU	BIOS_WBW	; BIOS_[WBW|UNA]: HARDWARE BIOS
+BATCOND		.EQU	FALSE		; ENABLE LOW BATTERY WARNING MESSAGE
 ;
 BOOTTYPE	.EQU	BT_MENU		; BT_[MENU|AUTO] IF AUTO, BOOT DEFAULT AFTER TIMEOUT
 BOOT_TIMEOUT	.EQU	20		; AUTO BOOT TIMEOUT IN SECONDS, 0 FOR IMMEDIATE BOOT
diff --git a/Source/HBIOS/cfg_zeta2.asm b/Source/HBIOS/cfg_zeta2.asm
index d8395bc5..7e3144ce 100644
--- a/Source/HBIOS/cfg_zeta2.asm
+++ b/Source/HBIOS/cfg_zeta2.asm
@@ -16,6 +16,7 @@
 PLATFORM	.EQU	PLT_ZETA2	; PLT_[SBC|ZETA|ZETA2|N8|MK4|UNA|RCZ80|RCZ180|EZZ80|SC126]
 CPUFAM		.EQU	CPU_Z80		; CPU FAMILY: CPU_[Z80|Z180]
 BIOS		.EQU	BIOS_WBW	; HARDWARE BIOS: BIOS_[WBW|UNA]
+BATCOND		.EQU	FALSE		; ENABLE LOW BATTERY WARNING MESSAGE
 ;
 BOOTTYPE	.EQU	BT_MENU		; BT_[MENU|AUTO], IF AUTO, BOOT DEFAULT AFTER TIMEOUT
 BOOT_TIMEOUT	.EQU	20		; AUTO BOOT TIMEOUT IN SECONDS, 0 FOR IMMEDIATE BOOT
diff --git a/Source/HBIOS/dsrtc.asm b/Source/HBIOS/dsrtc.asm
index 30d66ff8..9b0cff5d 100644
--- a/Source/HBIOS/dsrtc.asm
+++ b/Source/HBIOS/dsrtc.asm
@@ -121,7 +121,6 @@ DSRTC_IDLE	.EQU	%00101000	; QUIESCENT STATE
 #ENDIF
 ;
 DSRTC_BUFSIZ	.EQU	7		; 7 BYTE BUFFER (YYMMDDHHMMSSWW)
-DSBATCOND	.DB	0		; BATTERY STATE DETECTED AND SAVED AT BOOT 0=LOW
 ;
 ; RTC DEVICE INITIALIZATION ENTRY
 ;
@@ -190,13 +189,7 @@ DSRTC_INIT1:
 NOCHG1:
 	PRTS("OFF$")
 NOCHG2:
-	LD	A,(DSBATCOND)		; DISPLAY
-	OR	A			; BATTERY
-	JR	NZ,DSBATOK		; CONDITION
-	PRTS(" BATTERY LOW$")
-	
-DSBATOK:
-	XOR	A	; SIGNAL SUCCESS
+	XOR	A			; SIGNAL SUCCESS
 	RET
 ;
 ; RTC DEVICE FUNCTION DISPATCH ENTRY
diff --git a/Source/HBIOS/hbios.asm b/Source/HBIOS/hbios.asm
index 884ae3bc..60edda2c 100644
--- a/Source/HBIOS/hbios.asm
+++ b/Source/HBIOS/hbios.asm
@@ -847,24 +847,18 @@ HB_START:
 ; FAILURE TO COMPLETE TWO RAM ACCESSES BEFORE INSTALLING PROXY WILL RESULT
 ; IN THE ROM ID BYTES NOT BEING COPIED CORRECTLY AND CP/M APPLICATIONS
 ; WILL NOT START CORRECTLY WHEN THEY CHECK THE ROM ID VERSION BYTES.
+; THE BATTERY CONDITION VALUE IS TEMPORARILY STORED AT HBX_LOC - 1.
+; IF THERE IS NO DS1210 IN THE SYSTEM, THE CODE BELOW DOES NO HARM.
 ;
-	LD	DE,HBX_LOC		; RAM LOCATION FOR TEST
-	LD	A,(DE)			; RAM ACCESS 1
-	LD	B,A			; SAVE FOR COMPARISON 
-	CPL				; AND RESTORATION
-	LD	(DE),A			; RAM ACCESS 2
-	LD	A,(DE)			; RAM ACCESS 3
-	SUB	B			; A = 0 IF LOW BATTERY
-	PUSH	AF			; SAVE FOR DSRTC DRIVER
-					; WE SAVE THIS PROPERLY
-					; WHEN WE ARE EXECUTING
-					; IN RAM.
-	LD	A,B			
-	LD	(DE),A			; RESTORE TEST LOCATION
+	DEC	SP			; RESERVE A STACK BYTE
+	XOR	A			; ZERO MEANS LOW BAT
+	LD	(HBX_LOC - 1),A		; WRITE IT (SHOULD ALWAYS WORK)
+	INC	A			; 1 MEANS BAT OK
+	LD	(HBX_LOC - 1),A		; OVERWRITE IF NVC ALLOWS IT
 ;
 ; INSTALL PROXY IN UPPER MEMORY
 ;
-;	LD	DE,HBX_LOC		; AS PER ABOVE
+	LD	DE,HBX_LOC		; AS PER ABOVE
 	LD	HL,HBX_IMG
 	LD	BC,HBX_SIZ
 	LDIR
@@ -873,7 +867,7 @@ HB_START:
 ;
 	LD	A,(HB_RAMFLAG)
 	OR	A
-	JR	NZ,HB_START2
+	JR	NZ,HB_START1
 ;
 ; INSTALL HBIOS IN RAM BANK
 ;
@@ -901,14 +895,9 @@ HB_START1:				; BNKCALL ARRIVES HERE, BUT NOW RUNNING IN RAM BANK
 ;
 	DIAG(%00000111)
 ;
-	POP	AF			; CLEAR THE		
-	POP	AF			; LEFTOVER STACK 
-	POP	AF			; FROM HBX_BANKCALL
-HB_START2:
-#IF DSRTCENABLE
-	POP	AF			; RECALL BATTERY STATE AND SAVE 
-	LD	(DSBATCOND),A		; IN RAM ACCESSIBLE BY DSRTC DRIVER
-#ENDIF
+	LD	A,(HBX_LOC - 1)		; RECALL BATTERY STATE AND SAVE
+	LD	(HB_BATCOND),A		; FOR FUTURE REFERENCE
+;
 	LD	SP,HBX_LOC		; RESET STACK SINCE WE DO NOT RETURN
 	LD	A,TRUE			; ACCUM := TRUE
 	LD	(HB_RAMFLAG),A		; SET RAMFLAG
@@ -1439,6 +1428,15 @@ HB_PCPU:
 	CALL	PRTSTRD
 	.TEXT	"KB RAM$"
 ;
+; LOW BATTERY DIAGNOSTIC MESSAGE
+;
+#IF (BATCOND)
+	LD	A,(HB_BATCOND)
+	OR	A
+	LD	DE,STR_LOWBAT
+	CALL	Z,WRITESTR
+#ENDIF
+;
 ; PERFORM DEVICE INITIALIZATION
 ;
 	CALL	NEWLINE
@@ -3776,10 +3774,13 @@ HB_CPUTYPE	.DB	0		; 0=Z80, 1=80180, 2=SL1960, 3=ASCI BRG
 ;
 RTCVAL		.DB	0		; SHADOW VALUE FOR RTC LATCH PORT
 ;
+HB_BATCOND	.DB	0		; BATTERY CONDITION (0=LOW, 1=OK)
+;
 STR_BANNER	.DB	"RetroBrew HBIOS v", BIOSVER, ", ", TIMESTAMP, "$"
 STR_PLATFORM	.DB	PLATFORM_NAME, "$"
 STR_SWITCH	.DB	"*** Activating CRT Console ***$"
 STR_BADINT	.DB	"\r\n*** BAD INT ***\r\n$"
+STR_LOWBAT	.DB	"\r\n\r\n+++ LOW BATTERY +++$"
 ;
 #IF (DSKYENABLE)	;	'H','B','I','O',' ',' ',' ',' '
 MSG_HBVER		.DB	$BE,$FF,$8A,$FB,$80,$80,$80,$80	; "HBIO    "