diff --git a/Doc/ChangeLog.txt b/Doc/ChangeLog.txt
index c92bcd57..8d28bd22 100644
--- a/Doc/ChangeLog.txt
+++ b/Doc/ChangeLog.txt
@@ -5,6 +5,7 @@ Version 3.1
 - WBW: FDISK80 updated to allow reserving up to 256 slices
 - WBW: Added support dual 16C550 UART on RC2014 platform
 - WBW: Made .com images smaller (contain only Z-System now)
+- WBW: Support automatic clock hardware detection and fallback
 
 Version 3.0.1
 -------------
diff --git a/Source/HBIOS/Config/SCZ180_130.asm b/Source/HBIOS/Config/SCZ180_130.asm
index f0540499..cf84881b 100644
--- a/Source/HBIOS/Config/SCZ180_130.asm
+++ b/Source/HBIOS/Config/SCZ180_130.asm
@@ -40,8 +40,8 @@ LEDENABLE	.SET	TRUE		; ENABLE STATUS LED (SINGLE LED)
 ;
 DIAGENABLE	.SET	FALSE		; ENABLES OUTPUT TO 8 BIT LED DIAGNOSTIC PORT
 ;
-TIMRTCENABLE	.SET	TRUE		; ENABLE PERIODIC TIMER CLOCK DRIVER (TIMRTC.ASM)
 DSRTCENABLE	.SET	FALSE		; DSRTC: ENABLE DS-1302 CLOCK DRIVER (DSRTC.ASM)
+INTRTCENABLE	.SET	TRUE		; ENABLE PERIODIC INTERRUPT CLOCK DRIVER (INTRTC.ASM)
 ;
 UARTENABLE	.SET	FALSE		; UART: ENABLE 8250/16550-LIKE SERIAL DRIVER (UART.ASM)
 ASCIENABLE	.SET	TRUE		; ASCI: ENABLE Z180 ASCI SERIAL DRIVER (ASCI.ASM)
diff --git a/Source/HBIOS/Config/SCZ180_131.asm b/Source/HBIOS/Config/SCZ180_131.asm
index 1c42b809..c3b75a80 100644
--- a/Source/HBIOS/Config/SCZ180_131.asm
+++ b/Source/HBIOS/Config/SCZ180_131.asm
@@ -40,8 +40,8 @@ LEDENABLE	.SET	TRUE		; ENABLE STATUS LED (SINGLE LED)
 ;
 DIAGENABLE	.SET	FALSE		; ENABLES OUTPUT TO 8 BIT LED DIAGNOSTIC PORT
 ;
-TIMRTCENABLE	.SET	TRUE		; ENABLE PERIODIC TIMER CLOCK DRIVER (TIMRTC.ASM)
 DSRTCENABLE	.SET	FALSE		; DSRTC: ENABLE DS-1302 CLOCK DRIVER (DSRTC.ASM)
+INTRTCENABLE	.SET	TRUE		; ENABLE PERIODIC INTERRUPT CLOCK DRIVER (INTRTC.ASM)
 ;
 UARTENABLE	.SET	FALSE		; UART: ENABLE 8250/16550-LIKE SERIAL DRIVER (UART.ASM)
 ASCIENABLE	.SET	TRUE		; ASCI: ENABLE Z180 ASCI SERIAL DRIVER (ASCI.ASM)
diff --git a/Source/HBIOS/bqrtc.asm b/Source/HBIOS/bqrtc.asm
index d35889e2..34854e22 100644
--- a/Source/HBIOS/bqrtc.asm
+++ b/Source/HBIOS/bqrtc.asm
@@ -94,6 +94,10 @@ BQRTC_BUFSIZE	.EQU	6		; 6 BYTE BUFFER (YYMMDDHHMMSS)
 ; RTC Device Initialization Entry
 
 BQRTC_INIT:
+	LD	A,(RTC_DISPACT)		; RTC DISPATCHER ALREADY SET?
+	OR	A			; SET FLAGS
+	RET	NZ			; IF ALREADY ACTIVE, ABORT
+;
 	CALL	NEWLINE				; Formatting
 	PRTS("BQRTC: IO=0x$")
 	LD	A, BQRTC_BASE
@@ -127,6 +131,9 @@ BQRTC_INIT:
 	LD	A, (BQRTC_BUF_SEC)
 	CALL	PRTHEXBYTE
 
+	LD	BC,BQRTC_DISPATCH
+	CALL	RTC_SETDISP
+
 	XOR	A				; Signal success
 	RET
 	
diff --git a/Source/HBIOS/cfg_dyno.asm b/Source/HBIOS/cfg_dyno.asm
index 2663b22d..13714081 100644
--- a/Source/HBIOS/cfg_dyno.asm
+++ b/Source/HBIOS/cfg_dyno.asm
@@ -61,11 +61,6 @@ CRTACT		.EQU	FALSE		; ACTIVATE CRT (VDU,CVDU,PROPIO,ETC) AT STARTUP
 VDAEMU		.EQU	EMUTYP_ANSI	; VDA EMULATION: EMUTYP_[TTY|ANSI]
 ANSITRACE	.EQU	1		; ANSI DRIVER TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
 ;
-TIMRTCENABLE	.EQU	FALSE		; ENABLE PERIODIC TIMER CLOCK DRIVER (TIMRTC.ASM)
-;
-HTIMENABLE	.EQU	FALSE		; ENABLE SIMH TIMER SUPPORT
-SIMRTCENABLE	.EQU	FALSE		; ENABLE SIMH CLOCK DRIVER (SIMRTC.ASM)
-;
 DSRTCENABLE	.EQU	FALSE		; DSRTC: ENABLE DS-1302 CLOCK DRIVER (DSRTC.ASM)
 DSRTCMODE	.EQU	DSRTCMODE_STD	; DSRTC: OPERATING MODE: DSRTC_[STD|MFPIC]
 DSRTCCHG	.EQU	FALSE		; DSRTC: FORCE BATTERY CHARGE ON (USE WITH CAUTION!!!)
@@ -73,6 +68,11 @@ DSRTCCHG	.EQU	FALSE		; DSRTC: FORCE BATTERY CHARGE ON (USE WITH CAUTION!!!)
 BQRTCENABLE	.EQU	TRUE		; BQRTC: ENABLE BQ4845 CLOCK DRIVER (BQRTC.ASM)
 BQRTC_BASE	.EQU	$50		; BQRTC: I/O BASE ADDRESS
 ;
+INTRTCENABLE	.EQU	FALSE		; ENABLE PERIODIC INTERRUPT CLOCK DRIVER (INTRTC.ASM)
+;
+HTIMENABLE	.EQU	FALSE		; ENABLE SIMH TIMER SUPPORT
+SIMRTCENABLE	.EQU	FALSE		; ENABLE SIMH CLOCK DRIVER (SIMRTC.ASM)
+;
 UARTENABLE	.EQU	FALSE		; UART: ENABLE 8250/16550-LIKE SERIAL DRIVER (UART.ASM)
 ;
 ASCIENABLE	.EQU	TRUE		; ASCI: ENABLE Z180 ASCI SERIAL DRIVER (ASCI.ASM)
diff --git a/Source/HBIOS/cfg_ezz80.asm b/Source/HBIOS/cfg_ezz80.asm
index 387a81a1..1c64c652 100644
--- a/Source/HBIOS/cfg_ezz80.asm
+++ b/Source/HBIOS/cfg_ezz80.asm
@@ -58,11 +58,6 @@ CRTACT		.EQU	FALSE		; ACTIVATE CRT (VDU,CVDU,PROPIO,ETC) AT STARTUP
 VDAEMU		.EQU	EMUTYP_ANSI	; VDA EMULATION: EMUTYP_[TTY|ANSI]
 ANSITRACE	.EQU	1		; ANSI DRIVER TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
 ;
-TIMRTCENABLE	.EQU	FALSE		; ENABLE PERIODIC TIMER CLOCK DRIVER (TIMRTC.ASM)
-;
-HTIMENABLE	.EQU	FALSE		; ENABLE SIMH TIMER SUPPORT
-SIMRTCENABLE	.EQU	FALSE		; ENABLE SIMH CLOCK DRIVER (SIMRTC.ASM)
-;
 DSRTCENABLE	.EQU	TRUE		; DSRTC: ENABLE DS-1302 CLOCK DRIVER (DSRTC.ASM)
 DSRTCMODE	.EQU	DSRTCMODE_STD	; DSRTC: OPERATING MODE: DSRTC_[STD|MFPIC]
 DSRTCCHG	.EQU	FALSE		; DSRTC: FORCE BATTERY CHARGE ON (USE WITH CAUTION!!!)
@@ -70,6 +65,11 @@ DSRTCCHG	.EQU	FALSE		; DSRTC: FORCE BATTERY CHARGE ON (USE WITH CAUTION!!!)
 BQRTCENABLE	.EQU	FALSE		; BQRTC: ENABLE BQ4845 CLOCK DRIVER (BQRTC.ASM)
 BQRTC_BASE	.EQU	$50		; BQRTC: I/O BASE ADDRESS
 ;
+INTRTCENABLE	.EQU	FALSE		; ENABLE PERIODIC INTERRUPT CLOCK DRIVER (INTRTC.ASM)
+;
+HTIMENABLE	.EQU	FALSE		; ENABLE SIMH TIMER SUPPORT
+SIMRTCENABLE	.EQU	FALSE		; ENABLE SIMH CLOCK DRIVER (SIMRTC.ASM)
+;
 UARTENABLE	.EQU	TRUE		; UART: ENABLE 8250/16550-LIKE SERIAL DRIVER (UART.ASM)
 UARTOSC		.EQU	1843200		; UART: OSC FREQUENCY IN MHZ
 UARTCFG		.EQU	DEFSERCFG	; UART: LINE CONFIG FOR UART PORTS
diff --git a/Source/HBIOS/cfg_master.asm b/Source/HBIOS/cfg_master.asm
index 8606f352..55806745 100644
--- a/Source/HBIOS/cfg_master.asm
+++ b/Source/HBIOS/cfg_master.asm
@@ -80,11 +80,6 @@ KBDTRACE	.EQU	1		; KBD DRIVER TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
 PPKKBLOUT	.EQU	KBD_US		; PPK KEYBOARD LANGUAGE: KBD_[US|DE]
 KBDKBLOUT	.EQU	KBD_US		; KBD KEYBOARD LANGUAGE: KBD_[US|DE]
 ;
-TIMRTCENABLE	.EQU	FALSE		; ENABLE PERIODIC TIMER CLOCK DRIVER (TIMRTC.ASM)
-;
-HTIMENABLE	.EQU	FALSE		; ENABLE SIMH TIMER SUPPORT
-SIMRTCENABLE	.EQU	FALSE		; ENABLE SIMH CLOCK DRIVER (SIMRTC.ASM)
-;
 DSRTCENABLE	.EQU	FALSE		; DSRTC: ENABLE DS-1302 CLOCK DRIVER (DSRTC.ASM)
 DSRTCMODE	.EQU	DSRTCMODE_STD	; DSRTC: OPERATING MODE: DSRTC_[STD|MFPIC]
 DSRTCCHG	.EQU	FALSE		; DSRTC: FORCE BATTERY CHARGE ON (USE WITH CAUTION!!!)
@@ -92,6 +87,11 @@ DSRTCCHG	.EQU	FALSE		; DSRTC: FORCE BATTERY CHARGE ON (USE WITH CAUTION!!!)
 BQRTCENABLE	.EQU	FALSE		; BQRTC: ENABLE BQ4845 CLOCK DRIVER (BQRTC.ASM)
 BQRTC_BASE	.EQU	$50		; BQRTC: I/O BASE ADDRESS
 ;
+INTRTCENABLE	.EQU	FALSE		; ENABLE PERIODIC INTERRUPT CLOCK DRIVER (INTRTC.ASM)
+;
+HTIMENABLE	.EQU	FALSE		; ENABLE SIMH TIMER SUPPORT
+SIMRTCENABLE	.EQU	FALSE		; ENABLE SIMH CLOCK DRIVER (SIMRTC.ASM)
+;
 UARTENABLE	.EQU	FALSE		; UART: ENABLE 8250/16550-LIKE SERIAL DRIVER (UART.ASM)
 UARTOSC		.EQU	1843200		; UART: OSC FREQUENCY IN MHZ
 UARTCFG		.EQU	DEFSERCFG	; UART: LINE CONFIG FOR UART PORTS
diff --git a/Source/HBIOS/cfg_mk4.asm b/Source/HBIOS/cfg_mk4.asm
index 809c6d17..6ee68e4e 100644
--- a/Source/HBIOS/cfg_mk4.asm
+++ b/Source/HBIOS/cfg_mk4.asm
@@ -65,11 +65,6 @@ KBDTRACE	.EQU	1		; KBD DRIVER TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
 PPKKBLOUT	.EQU	KBD_US		; PPK KEYBOARD LANGUAGE: KBD_[US|DE]
 KBDKBLOUT	.EQU	KBD_US		; KBD KEYBOARD LANGUAGE: KBD_[US|DE]
 ;
-TIMRTCENABLE	.EQU	FALSE		; ENABLE PERIODIC TIMER CLOCK DRIVER (TIMRTC.ASM)
-;
-HTIMENABLE	.EQU	FALSE		; ENABLE SIMH TIMER SUPPORT
-SIMRTCENABLE	.EQU	FALSE		; ENABLE SIMH CLOCK DRIVER (SIMRTC.ASM)
-;
 DSRTCENABLE	.EQU	TRUE		; DSRTC: ENABLE DS-1302 CLOCK DRIVER (DSRTC.ASM)
 DSRTCMODE	.EQU	DSRTCMODE_STD	; DSRTC: OPERATING MODE: DSRTC_[STD|MFPIC]
 DSRTCCHG	.EQU	FALSE		; DSRTC: FORCE BATTERY CHARGE ON (USE WITH CAUTION!!!)
@@ -77,6 +72,11 @@ DSRTCCHG	.EQU	FALSE		; DSRTC: FORCE BATTERY CHARGE ON (USE WITH CAUTION!!!)
 BQRTCENABLE	.EQU	FALSE		; BQRTC: ENABLE BQ4845 CLOCK DRIVER (BQRTC.ASM)
 BQRTC_BASE	.EQU	$50		; BQRTC: I/O BASE ADDRESS
 ;
+INTRTCENABLE	.EQU	FALSE		; ENABLE PERIODIC INTERRUPT CLOCK DRIVER (INTRTC.ASM)
+;
+HTIMENABLE	.EQU	FALSE		; ENABLE SIMH TIMER SUPPORT
+SIMRTCENABLE	.EQU	FALSE		; ENABLE SIMH CLOCK DRIVER (SIMRTC.ASM)
+;
 UARTENABLE	.EQU	TRUE		; UART: ENABLE 8250/16550-LIKE SERIAL DRIVER (UART.ASM)
 UARTOSC		.EQU	1843200		; UART: OSC FREQUENCY IN MHZ
 UARTCFG		.EQU	DEFSERCFG	; UART: LINE CONFIG FOR UART PORTS
diff --git a/Source/HBIOS/cfg_n8.asm b/Source/HBIOS/cfg_n8.asm
index 69a9a2b4..cd18db22 100644
--- a/Source/HBIOS/cfg_n8.asm
+++ b/Source/HBIOS/cfg_n8.asm
@@ -68,11 +68,6 @@ KBDTRACE	.EQU	1		; KBD DRIVER TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
 PPKKBLOUT	.EQU	KBD_US		; PPK KEYBOARD LANGUAGE: KBD_[US|DE]
 KBDKBLOUT	.EQU	KBD_US		; KBD KEYBOARD LANGUAGE: KBD_[US|DE]
 ;
-TIMRTCENABLE	.EQU	FALSE		; ENABLE PERIODIC TIMER CLOCK DRIVER (TIMRTC.ASM)
-;
-HTIMENABLE	.EQU	FALSE		; ENABLE SIMH TIMER SUPPORT
-SIMRTCENABLE	.EQU	FALSE		; ENABLE SIMH CLOCK DRIVER (SIMRTC.ASM)
-;
 DSRTCENABLE	.EQU	TRUE		; DSRTC: ENABLE DS-1302 CLOCK DRIVER (DSRTC.ASM)
 DSRTCMODE	.EQU	DSRTCMODE_STD	; DSRTC: OPERATING MODE: DSRTC_[STD|MFPIC]
 DSRTCCHG	.EQU	FALSE		; DSRTC: FORCE BATTERY CHARGE ON (USE WITH CAUTION!!!)
@@ -80,6 +75,11 @@ DSRTCCHG	.EQU	FALSE		; DSRTC: FORCE BATTERY CHARGE ON (USE WITH CAUTION!!!)
 BQRTCENABLE	.EQU	FALSE		; BQRTC: ENABLE BQ4845 CLOCK DRIVER (BQRTC.ASM)
 BQRTC_BASE	.EQU	$50		; BQRTC: I/O BASE ADDRESS
 ;
+INTRTCENABLE	.EQU	FALSE		; ENABLE PERIODIC INTERRUPT CLOCK DRIVER (INTRTC.ASM)
+;
+HTIMENABLE	.EQU	FALSE		; ENABLE SIMH TIMER SUPPORT
+SIMRTCENABLE	.EQU	FALSE		; ENABLE SIMH CLOCK DRIVER (SIMRTC.ASM)
+;
 UARTENABLE	.EQU	TRUE		; UART: ENABLE 8250/16550-LIKE SERIAL DRIVER (UART.ASM)
 UARTOSC		.EQU	1843200		; UART: OSC FREQUENCY IN MHZ
 UARTCFG		.EQU	DEFSERCFG	; UART: LINE CONFIG FOR UART PORTS
diff --git a/Source/HBIOS/cfg_rcz180.asm b/Source/HBIOS/cfg_rcz180.asm
index 42e2b034..ee65373f 100644
--- a/Source/HBIOS/cfg_rcz180.asm
+++ b/Source/HBIOS/cfg_rcz180.asm
@@ -61,11 +61,6 @@ CRTACT		.EQU	FALSE		; ACTIVATE CRT (VDU,CVDU,PROPIO,ETC) AT STARTUP
 VDAEMU		.EQU	EMUTYP_ANSI	; VDA EMULATION: EMUTYP_[TTY|ANSI]
 ANSITRACE	.EQU	1		; ANSI DRIVER TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
 ;
-TIMRTCENABLE	.EQU	FALSE		; ENABLE PERIODIC TIMER CLOCK DRIVER (TIMRTC.ASM)
-;
-HTIMENABLE	.EQU	FALSE		; ENABLE SIMH TIMER SUPPORT
-SIMRTCENABLE	.EQU	FALSE		; ENABLE SIMH CLOCK DRIVER (SIMRTC.ASM)
-;
 DSRTCENABLE	.EQU	TRUE		; DSRTC: ENABLE DS-1302 CLOCK DRIVER (DSRTC.ASM)
 DSRTCMODE	.EQU	DSRTCMODE_STD	; DSRTC: OPERATING MODE: DSRTC_[STD|MFPIC]
 DSRTCCHG	.EQU	FALSE		; DSRTC: FORCE BATTERY CHARGE ON (USE WITH CAUTION!!!)
@@ -73,6 +68,11 @@ DSRTCCHG	.EQU	FALSE		; DSRTC: FORCE BATTERY CHARGE ON (USE WITH CAUTION!!!)
 BQRTCENABLE	.EQU	FALSE		; BQRTC: ENABLE BQ4845 CLOCK DRIVER (BQRTC.ASM)
 BQRTC_BASE	.EQU	$50		; BQRTC: I/O BASE ADDRESS
 ;
+INTRTCENABLE	.EQU	FALSE		; ENABLE PERIODIC INTERRUPT CLOCK DRIVER (INTRTC.ASM)
+;
+HTIMENABLE	.EQU	FALSE		; ENABLE SIMH TIMER SUPPORT
+SIMRTCENABLE	.EQU	FALSE		; ENABLE SIMH CLOCK DRIVER (SIMRTC.ASM)
+;
 UARTENABLE	.EQU	TRUE		; UART: ENABLE 8250/16550-LIKE SERIAL DRIVER (UART.ASM)
 UARTOSC		.EQU	1843200		; UART: OSC FREQUENCY IN MHZ
 UARTCFG		.EQU	DEFSERCFG	; UART: LINE CONFIG FOR UART PORTS
diff --git a/Source/HBIOS/cfg_rcz80.asm b/Source/HBIOS/cfg_rcz80.asm
index 6e97158e..40b3d129 100644
--- a/Source/HBIOS/cfg_rcz80.asm
+++ b/Source/HBIOS/cfg_rcz80.asm
@@ -57,11 +57,6 @@ CRTACT		.EQU	FALSE		; ACTIVATE CRT (VDU,CVDU,PROPIO,ETC) AT STARTUP
 VDAEMU		.EQU	EMUTYP_ANSI	; VDA EMULATION: EMUTYP_[TTY|ANSI]
 ANSITRACE	.EQU	1		; ANSI DRIVER TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
 ;
-TIMRTCENABLE	.EQU	FALSE		; ENABLE PERIODIC TIMER CLOCK DRIVER (TIMRTC.ASM)
-;
-HTIMENABLE	.EQU	FALSE		; ENABLE SIMH TIMER SUPPORT
-SIMRTCENABLE	.EQU	FALSE		; ENABLE SIMH CLOCK DRIVER (SIMRTC.ASM)
-;
 DSRTCENABLE	.EQU	TRUE		; DSRTC: ENABLE DS-1302 CLOCK DRIVER (DSRTC.ASM)
 DSRTCMODE	.EQU	DSRTCMODE_STD	; DSRTC: OPERATING MODE: DSRTC_[STD|MFPIC]
 DSRTCCHG	.EQU	FALSE		; DSRTC: FORCE BATTERY CHARGE ON (USE WITH CAUTION!!!)
@@ -69,6 +64,11 @@ DSRTCCHG	.EQU	FALSE		; DSRTC: FORCE BATTERY CHARGE ON (USE WITH CAUTION!!!)
 BQRTCENABLE	.EQU	FALSE		; BQRTC: ENABLE BQ4845 CLOCK DRIVER (BQRTC.ASM)
 BQRTC_BASE	.EQU	$50		; BQRTC: I/O BASE ADDRESS
 ;
+INTRTCENABLE	.EQU	FALSE		; ENABLE PERIODIC INTERRUPT CLOCK DRIVER (INTRTC.ASM)
+;
+HTIMENABLE	.EQU	FALSE		; ENABLE SIMH TIMER SUPPORT
+SIMRTCENABLE	.EQU	FALSE		; ENABLE SIMH CLOCK DRIVER (SIMRTC.ASM)
+;
 UARTENABLE	.EQU	TRUE		; UART: ENABLE 8250/16550-LIKE SERIAL DRIVER (UART.ASM)
 UARTOSC		.EQU	1843200		; UART: OSC FREQUENCY IN MHZ
 UARTCFG		.EQU	DEFSERCFG	; UART: LINE CONFIG FOR UART PORTS
diff --git a/Source/HBIOS/cfg_sbc.asm b/Source/HBIOS/cfg_sbc.asm
index b82ef66a..e451213d 100644
--- a/Source/HBIOS/cfg_sbc.asm
+++ b/Source/HBIOS/cfg_sbc.asm
@@ -59,11 +59,6 @@ KBDTRACE	.EQU	1		; KBD DRIVER TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
 PPKKBLOUT	.EQU	KBD_US		; PPK KEYBOARD LANGUAGE: KBD_[US|DE]
 KBDKBLOUT	.EQU	KBD_US		; KBD KEYBOARD LANGUAGE: KBD_[US|DE]
 ;
-TIMRTCENABLE	.EQU	FALSE		; ENABLE PERIODIC TIMER CLOCK DRIVER (TIMRTC.ASM)
-;
-HTIMENABLE	.EQU	FALSE		; ENABLE SIMH TIMER SUPPORT
-SIMRTCENABLE	.EQU	FALSE		; ENABLE SIMH CLOCK DRIVER (SIMRTC.ASM)
-;
 DSRTCENABLE	.EQU	TRUE		; DSRTC: ENABLE DS-1302 CLOCK DRIVER (DSRTC.ASM)
 DSRTCMODE	.EQU	DSRTCMODE_STD	; DSRTC: OPERATING MODE: DSRTC_[STD|MFPIC]
 DSRTCCHG	.EQU	FALSE		; DSRTC: FORCE BATTERY CHARGE ON (USE WITH CAUTION!!!)
@@ -71,6 +66,11 @@ DSRTCCHG	.EQU	FALSE		; DSRTC: FORCE BATTERY CHARGE ON (USE WITH CAUTION!!!)
 BQRTCENABLE	.EQU	FALSE		; BQRTC: ENABLE BQ4845 CLOCK DRIVER (BQRTC.ASM)
 BQRTC_BASE	.EQU	$50		; BQRTC: I/O BASE ADDRESS
 ;
+INTRTCENABLE	.EQU	FALSE		; ENABLE PERIODIC INTERRUPT CLOCK DRIVER (INTRTC.ASM)
+;
+HTIMENABLE	.EQU	FALSE		; ENABLE SIMH TIMER SUPPORT
+SIMRTCENABLE	.EQU	FALSE		; ENABLE SIMH CLOCK DRIVER (SIMRTC.ASM)
+;
 UARTENABLE	.EQU	TRUE		; UART: ENABLE 8250/16550-LIKE SERIAL DRIVER (UART.ASM)
 UARTOSC		.EQU	1843200		; UART: OSC FREQUENCY IN MHZ
 UARTCFG		.EQU	DEFSERCFG	; UART: LINE CONFIG FOR UART PORTS
diff --git a/Source/HBIOS/cfg_scz180.asm b/Source/HBIOS/cfg_scz180.asm
index d11da6f0..a92c4105 100644
--- a/Source/HBIOS/cfg_scz180.asm
+++ b/Source/HBIOS/cfg_scz180.asm
@@ -56,11 +56,6 @@ CRTACT		.EQU	FALSE		; ACTIVATE CRT (VDU,CVDU,PROPIO,ETC) AT STARTUP
 VDAEMU		.EQU	EMUTYP_ANSI	; VDA EMULATION: EMUTYP_[TTY|ANSI]
 ANSITRACE	.EQU	1		; ANSI DRIVER TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
 ;
-TIMRTCENABLE	.EQU	FALSE		; ENABLE PERIODIC TIMER CLOCK DRIVER (TIMRTC.ASM)
-;
-HTIMENABLE	.EQU	FALSE		; ENABLE SIMH TIMER SUPPORT
-SIMRTCENABLE	.EQU	FALSE		; ENABLE SIMH CLOCK DRIVER (SIMRTC.ASM)
-;
 DSRTCENABLE	.EQU	TRUE		; DSRTC: ENABLE DS-1302 CLOCK DRIVER (DSRTC.ASM)
 DSRTCMODE	.EQU	DSRTCMODE_STD	; DSRTC: OPERATING MODE: DSRTC_[STD|MFPIC]
 DSRTCCHG	.EQU	FALSE		; DSRTC: FORCE BATTERY CHARGE ON (USE WITH CAUTION!!!)
@@ -68,6 +63,11 @@ DSRTCCHG	.EQU	FALSE		; DSRTC: FORCE BATTERY CHARGE ON (USE WITH CAUTION!!!)
 BQRTCENABLE	.EQU	FALSE		; BQRTC: ENABLE BQ4845 CLOCK DRIVER (BQRTC.ASM)
 BQRTC_BASE	.EQU	$50		; BQRTC: I/O BASE ADDRESS
 ;
+INTRTCENABLE	.EQU	FALSE		; ENABLE PERIODIC INTERRUPT CLOCK DRIVER (INTRTC.ASM)
+;
+HTIMENABLE	.EQU	FALSE		; ENABLE SIMH TIMER SUPPORT
+SIMRTCENABLE	.EQU	FALSE		; ENABLE SIMH CLOCK DRIVER (SIMRTC.ASM)
+;
 UARTENABLE	.EQU	TRUE		; UART: ENABLE 8250/16550-LIKE SERIAL DRIVER (UART.ASM)
 UARTOSC		.EQU	1843200		; UART: OSC FREQUENCY IN MHZ
 UARTCFG		.EQU	DEFSERCFG	; UART: LINE CONFIG FOR UART PORTS
diff --git a/Source/HBIOS/cfg_zeta.asm b/Source/HBIOS/cfg_zeta.asm
index dc3c082d..ca9dfb7e 100644
--- a/Source/HBIOS/cfg_zeta.asm
+++ b/Source/HBIOS/cfg_zeta.asm
@@ -53,11 +53,6 @@ CRTACT		.EQU	FALSE		; ACTIVATE CRT (VDU,CVDU,PROPIO,ETC) AT STARTUP
 VDAEMU		.EQU	EMUTYP_ANSI	; VDA EMULATION: EMUTYP_[TTY|ANSI]
 ANSITRACE	.EQU	1		; ANSI DRIVER TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
 ;
-TIMRTCENABLE	.EQU	FALSE		; ENABLE PERIODIC TIMER CLOCK DRIVER (TIMRTC.ASM)
-;
-HTIMENABLE	.EQU	FALSE		; ENABLE SIMH TIMER SUPPORT
-SIMRTCENABLE	.EQU	FALSE		; ENABLE SIMH CLOCK DRIVER (SIMRTC.ASM)
-;
 DSRTCENABLE	.EQU	TRUE		; DSRTC: ENABLE DS-1302 CLOCK DRIVER (DSRTC.ASM)
 DSRTCMODE	.EQU	DSRTCMODE_STD	; DSRTC: OPERATING MODE: DSRTC_[STD|MFPIC]
 DSRTCCHG	.EQU	FALSE		; DSRTC: FORCE BATTERY CHARGE ON (USE WITH CAUTION!!!)
@@ -65,6 +60,11 @@ DSRTCCHG	.EQU	FALSE		; DSRTC: FORCE BATTERY CHARGE ON (USE WITH CAUTION!!!)
 BQRTCENABLE	.EQU	FALSE		; BQRTC: ENABLE BQ4845 CLOCK DRIVER (BQRTC.ASM)
 BQRTC_BASE	.EQU	$50		; BQRTC: I/O BASE ADDRESS
 ;
+HTIMENABLE	.EQU	FALSE		; ENABLE SIMH TIMER SUPPORT
+SIMRTCENABLE	.EQU	FALSE		; ENABLE SIMH CLOCK DRIVER (SIMRTC.ASM)
+;
+INTRTCENABLE	.EQU	FALSE		; ENABLE PERIODIC INTERRUPT CLOCK DRIVER (INTRTC.ASM)
+;
 UARTENABLE	.EQU	TRUE		; UART: ENABLE 8250/16550-LIKE SERIAL DRIVER (UART.ASM)
 UARTOSC		.EQU	1843200		; UART: OSC FREQUENCY IN MHZ
 UARTCFG		.EQU	DEFSERCFG	; UART: LINE CONFIG FOR UART PORTS
diff --git a/Source/HBIOS/cfg_zeta2.asm b/Source/HBIOS/cfg_zeta2.asm
index 30e036e7..35eaddbe 100644
--- a/Source/HBIOS/cfg_zeta2.asm
+++ b/Source/HBIOS/cfg_zeta2.asm
@@ -58,11 +58,6 @@ CRTACT		.EQU	FALSE		; ACTIVATE CRT (VDU,CVDU,PROPIO,ETC) AT STARTUP
 VDAEMU		.EQU	EMUTYP_ANSI	; VDA EMULATION: EMUTYP_[TTY|ANSI]
 ANSITRACE	.EQU	1		; ANSI DRIVER TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
 ;
-TIMRTCENABLE	.EQU	FALSE		; ENABLE PERIODIC TIMER CLOCK DRIVER (TIMRTC.ASM)
-;
-HTIMENABLE	.EQU	FALSE		; ENABLE SIMH TIMER SUPPORT
-SIMRTCENABLE	.EQU	FALSE		; ENABLE SIMH CLOCK DRIVER (SIMRTC.ASM)
-;
 DSRTCENABLE	.EQU	TRUE		; DSRTC: ENABLE DS-1302 CLOCK DRIVER (DSRTC.ASM)
 DSRTCMODE	.EQU	DSRTCMODE_STD	; DSRTC: OPERATING MODE: DSRTC_[STD|MFPIC]
 DSRTCCHG	.EQU	FALSE		; DSRTC: FORCE BATTERY CHARGE ON (USE WITH CAUTION!!!)
@@ -70,6 +65,11 @@ DSRTCCHG	.EQU	FALSE		; DSRTC: FORCE BATTERY CHARGE ON (USE WITH CAUTION!!!)
 BQRTCENABLE	.EQU	FALSE		; BQRTC: ENABLE BQ4845 CLOCK DRIVER (BQRTC.ASM)
 BQRTC_BASE	.EQU	$50		; BQRTC: I/O BASE ADDRESS
 ;
+INTRTCENABLE	.EQU	FALSE		; ENABLE PERIODIC INTERRUPT CLOCK DRIVER (INTRTC.ASM)
+;
+HTIMENABLE	.EQU	FALSE		; ENABLE SIMH TIMER SUPPORT
+SIMRTCENABLE	.EQU	FALSE		; ENABLE SIMH CLOCK DRIVER (SIMRTC.ASM)
+;
 UARTENABLE	.EQU	TRUE		; UART: ENABLE 8250/16550-LIKE SERIAL DRIVER (UART.ASM)
 UARTOSC		.EQU	1843200		; UART: OSC FREQUENCY IN MHZ
 UARTCFG		.EQU	DEFSERCFG	; UART: LINE CONFIG FOR UART PORTS
diff --git a/Source/HBIOS/dsrtc.asm b/Source/HBIOS/dsrtc.asm
index 607cc6aa..5bcd596f 100644
--- a/Source/HBIOS/dsrtc.asm
+++ b/Source/HBIOS/dsrtc.asm
@@ -159,6 +159,10 @@ DSRTC_PREINIT1:
 ; RTC DEVICE INITIALIZATION ENTRY
 ;
 DSRTC_INIT:
+	LD	A,(RTC_DISPACT)		; RTC DISPATCHER ALREADY SET?
+	OR	A			; SET FLAGS
+	RET	NZ			; IF ALREADY ACTIVE, ABORT
+;
 	CALL	NEWLINE			; FORMATTING
 	PRTS("DSRTC: MODE=$")
 ;
@@ -206,6 +210,10 @@ DSRTC_INIT1:
 NOCHG1:
 	PRTS("OFF$")
 NOCHG2:
+;
+	LD	BC,DSRTC_DISPATCH
+	CALL	RTC_SETDISP
+;
 	XOR	A			; SIGNAL SUCCESS
 	RET
 ;
diff --git a/Source/HBIOS/hbios.asm b/Source/HBIOS/hbios.asm
index 19fe94d2..55ed757e 100644
--- a/Source/HBIOS/hbios.asm
+++ b/Source/HBIOS/hbios.asm
@@ -1668,18 +1668,18 @@ HB_INITTBL:
 #IF (ACIAENABLE)
 	.DW	ACIA_INIT
 #ENDIF
-#IF (TIMRTCENABLE)
-	.DW	TIMRTC_INIT
-#ENDIF
-#IF (SIMRTCENABLE)
-	.DW	SIMRTC_INIT
-#ENDIF
 #IF (DSRTCENABLE)
 	.DW	DSRTC_INIT
 #ENDIF
 #IF (BQRTCENABLE)
 	.DW	BQRTC_INIT
 #ENDIF
+#IF (SIMRTCENABLE)
+	.DW	SIMRTC_INIT
+#ENDIF
+#IF (INTRTCENABLE)
+	.DW	INTRTC_INIT
+#ENDIF
 #IF (VDUENABLE)
 	.DW	VDU_INIT
 #ENDIF
@@ -2153,22 +2153,30 @@ HB_IOBNK	.DB	0		; CURRENT IO BUFFER BANK ID
 ;   B: FUNCTION
 ;
 RTC_DISPATCH:
-#IF (TIMRTCENABLE)
-	JP	TIMRTC_DISPATCH
-#ENDIF
-#IF (SIMRTCENABLE)
-	JP	SIMRTC_DISPATCH
-#ENDIF
-#IF (DSRTCENABLE)
-	JP	DSRTC_DISPATCH
-#ENDIF
-#IF (BQRTCENABLE)
-	JP	BQRTC_DISPATCH
-#ENDIF
-	;CALL	PANIC
+	PUSH	HL			; SAVE INCOMING HL
+	LD	HL,(RTC_DISPADR)	; 
+	EX	(SP),HL
+	RET
+;
+RTC_DISPERR:
 	OR	$FF
 	RET
 ;
+; SET RTC DISPATCH ADDRESS, USED BY RTC DRIVERS DURING INIT
+; BC HAS ADDRESS OF DISPATCH ADDRESS
+; WILL ONLY SAVE THE FIRST ADDRESS SET
+;
+RTC_SETDISP:
+	LD	(RTC_DISPADR),BC	; SAVE THE ADDRESS
+	OR	$FF			; FLAG ACTIVE VALUE
+	LD	(RTC_DISPACT),A		; SAVE IT
+	RET				; AND DONE
+;
+;
+;
+RTC_DISPADR	.DW	RTC_DISPERR	; RTC DISPATCH ADDRESS
+RTC_DISPACT	.DB	0		; SET WHEN DISPADR SET
+;
 ;==================================================================================================
 ;   VIDEO DISPLAY ADAPTER DEVICE DISPATCHER
 ;==================================================================================================
@@ -2933,23 +2941,6 @@ HB_TMPREF	.DW	0
 ;   DEVICE DRIVERS
 ;==================================================================================================
 ;
-#IF (TIMRTCENABLE)
-ORG_TIMRTC	.EQU	$
-  #INCLUDE "timrtc.asm"
-SIZ_TIMRTC	.EQU	$ - ORG_TIMRTC
-		.ECHO	"TIMRTC occupies "
-		.ECHO	SIZ_TIMRTC
-		.ECHO	" bytes.\n"
-#ENDIF
-#IF (SIMRTCENABLE)
-ORG_SIMRTC	.EQU	$
-  #INCLUDE "simrtc.asm"
-SIZ_SIMRTC	.EQU	$ - ORG_SIMRTC
-		.ECHO	"SIMRTC occupies "
-		.ECHO	SIZ_SIMRTC
-		.ECHO	" bytes.\n"
-#ENDIF
-;
 #IF (DSRTCENABLE)
 ORG_DSRTC	.EQU	$
   #INCLUDE "dsrtc.asm"
@@ -2967,6 +2958,23 @@ SIZ_BQRTC	.EQU	$ - ORG_BQRTC
 		.ECHO	SIZ_BQRTC
 		.ECHO	" bytes.\n"
 #ENDIF
+#IF (SIMRTCENABLE)
+ORG_SIMRTC	.EQU	$
+  #INCLUDE "simrtc.asm"
+SIZ_SIMRTC	.EQU	$ - ORG_SIMRTC
+		.ECHO	"SIMRTC occupies "
+		.ECHO	SIZ_SIMRTC
+		.ECHO	" bytes.\n"
+#ENDIF
+;
+#IF (INTRTCENABLE)
+ORG_INTRTC	.EQU	$
+  #INCLUDE "intrtc.asm"
+SIZ_INTRTC	.EQU	$ - ORG_INTRTC
+		.ECHO	"INTRTC occupies "
+		.ECHO	SIZ_INTRTC
+		.ECHO	" bytes.\n"
+#ENDIF
 ;
 #IF (ASCIENABLE)
 ORG_ASCI	.EQU	$
diff --git a/Source/HBIOS/timrtc.asm b/Source/HBIOS/intrtc.asm
similarity index 58%
rename from Source/HBIOS/timrtc.asm
rename to Source/HBIOS/intrtc.asm
index 70733edd..0414a286 100644
--- a/Source/HBIOS/timrtc.asm
+++ b/Source/HBIOS/intrtc.asm
@@ -3,24 +3,31 @@
 ; SYSTEM TIMER BASED CLOCK DRIVER
 ;==================================================================================================
 ;
-TIMRTC_BUFSIZ	.EQU	6	; SIX BYTE BUFFER (YYMMDDHHMMSS)
+INTRTC_BUFSIZ	.EQU	6	; SIX BYTE BUFFER (YYMMDDHHMMSS)
 ;
 ; RTC DEVICE INITIALIZATION ENTRY
 ;
-TIMRTC_INIT:
+INTRTC_INIT:
+	LD	A,(RTC_DISPACT)		; RTC DISPATCHER ALREADY SET?
+	OR	A			; SET FLAGS
+	RET	NZ			; IF ALREADY ACTIVE, ABORT
+;
 	CALL	NEWLINE		; FORMATTING
-	PRTS("TIMRTC: $")
+	PRTS("INTRTC: $")
 ;
 	; HOOK THE HBIOS SECONDS VECTOR
 	LD	HL,(VEC_SECOND+1)	; GET CUR SECONDS VECTOR
-	LD	(TIMRTC_VEC),HL		; SAVE IT INTERNALLY
-	LD	HL,TIMRTC_INT		; OUR SECONDS INT ENTRY
+	LD	(INTRTC_VEC),HL		; SAVE IT INTERNALLY
+	LD	HL,INTRTC_INT		; OUR SECONDS INT ENTRY
 	LD	(VEC_SECOND+1),HL	; REPLACE IT
 ;
 	; DISPLAY CURRENT TIME
-	CALL	TIMRTC_GETTIM0
-	LD	HL,TIMRTC_BCDBUF	; POINT TO BCD BUF
+	CALL	INTRTC_GETTIM0
+	LD	HL,INTRTC_BCDBUF	; POINT TO BCD BUF
 	CALL	PRTDT
+;
+	LD	BC,INTRTC_DISPATCH
+	CALL	RTC_SETDISP
 ;
 	XOR	A		; SIGNAL SUCCESS
 	RET
@@ -29,28 +36,28 @@ TIMRTC_INIT:
 ;   A: RESULT (OUT), 0=OK, Z=OK, NZ=ERR
 ;   B: FUNCTION (IN)
 ;
-TIMRTC_DISPATCH:
+INTRTC_DISPATCH:
 	LD	A,B		; GET REQUESTED FUNCTION
 	AND	$0F		; ISOLATE SUB-FUNCTION
-	JP	Z,TIMRTC_GETTIM	; GET TIME
+	JP	Z,INTRTC_GETTIM	; GET TIME
 	DEC	A
-	JP	Z,TIMRTC_SETTIM	; SET TIME
+	JP	Z,INTRTC_SETTIM	; SET TIME
 	DEC	A
-	JP	Z,TIMRTC_GETBYT	; GET NVRAM BYTE VALUE
+	JP	Z,INTRTC_GETBYT	; GET NVRAM BYTE VALUE
 	DEC	A
-	JP	Z,TIMRTC_SETBYT	; SET NVRAM BYTE VALUE
+	JP	Z,INTRTC_SETBYT	; SET NVRAM BYTE VALUE
 	DEC	A
-	JP	Z,TIMRTC_GETBLK	; GET NVRAM DATA BLOCK VALUES
+	JP	Z,INTRTC_GETBLK	; GET NVRAM DATA BLOCK VALUES
 	DEC	A
-	JP	Z,TIMRTC_SETBLK	; SET NVRAM DATA BLOCK VALUES 
+	JP	Z,INTRTC_SETBLK	; SET NVRAM DATA BLOCK VALUES 
 	CALL	PANIC
 ;
 ; NVRAM FUNCTIONS ARE NOT AVAILABLE IN SIMULATOR
 ;
-TIMRTC_GETBYT:
-TIMRTC_SETBYT:
-TIMRTC_GETBLK:
-TIMRTC_SETBLK:
+INTRTC_GETBYT:
+INTRTC_SETBYT:
+INTRTC_GETBLK:
+INTRTC_SETBLK:
 	CALL	PANIC
 ;
 ; RTC GET TIME
@@ -59,19 +66,19 @@ TIMRTC_SETBLK:
 ; BUFFER FORMAT IS BCD: YYMMDDHHMMSS
 ; 24 HOUR TIME FORMAT IS ASSUMED
 ;
-TIMRTC_GETTIM:
+INTRTC_GETTIM:
 	; GET THE TIME INTO TEMP BUF
 	PUSH	HL			; SAVE PTR TO CALLERS BUFFER
-	CALL	TIMRTC_GETTIM0		; GET TIME TO WORK BUFFER
+	CALL	INTRTC_GETTIM0		; GET TIME TO WORK BUFFER
 ;
 	; NOW COPY TO REAL DESTINATION (INTERBANK SAFE)
 	LD	A,BID_BIOS		; COPY FROM BIOS BANK
 	LD	(HB_SRCBNK),A		; SET IT
 	LD	A,(HB_INVBNK)		; COPY TO CURRENT USER BANK
 	LD	(HB_DSTBNK),A		; SET IT
-	LD	HL,TIMRTC_BCDBUF	; SOURCE ADR
+	LD	HL,INTRTC_BCDBUF	; SOURCE ADR
 	POP	DE			; DEST ADR
-	LD	BC,TIMRTC_BUFSIZ	; LENGTH
+	LD	BC,INTRTC_BUFSIZ	; LENGTH
 	CALL	HB_BNKCPY		; COPY THE CLOCK DATA
 ;
 	LD	DE,60			; DELAY 60 * 16US = ~1MS
@@ -79,11 +86,11 @@ TIMRTC_GETTIM:
 	XOR	A			; SIGNAL SUCCESS
 	RET				; AND RETURN
 ;
-TIMRTC_GETTIM0:
-	LD	HL,TIMRTC_BINBUF	; FROM BINARY BUFFER
-	LD	DE,TIMRTC_BCDBUF	; TO BCD BUFFER
+INTRTC_GETTIM0:
+	LD	HL,INTRTC_BINBUF	; FROM BINARY BUFFER
+	LD	DE,INTRTC_BCDBUF	; TO BCD BUFFER
 	HB_DI
-	CALL	TIMRTC_BIN2BCD		; COPY AND CONVERT
+	CALL	INTRTC_BIN2BCD		; COPY AND CONVERT
 	HB_EI
 	RET
 ;
@@ -93,20 +100,20 @@ TIMRTC_GETTIM0:
 ; BUFFER FORMAT IS BCD: YYMMDDHHMMSSWW
 ; 24 HOUR TIME FORMAT IS ASSUMED
 ;
-TIMRTC_SETTIM:
+INTRTC_SETTIM:
 	; COPY TO BCD BUF
 	LD	A,(HB_INVBNK)		; COPY FROM CURRENT USER BANK
 	LD	(HB_SRCBNK),A		; SET IT
 	LD	A,BID_BIOS		; COPY TO BIOS BANK
 	LD	(HB_DSTBNK),A		; SET IT
-	LD	DE,TIMRTC_BCDBUF	; DEST ADR
-	LD	BC,TIMRTC_BUFSIZ	; LENGTH
+	LD	DE,INTRTC_BCDBUF	; DEST ADR
+	LD	BC,INTRTC_BUFSIZ	; LENGTH
 	CALL	HB_BNKCPY		; COPY THE CLOCK DATA
 ;
-	LD	HL,TIMRTC_BCDBUF	; FROM BCD BUF
-	LD	DE,TIMRTC_BINBUF	; TO BIN BUF
+	LD	HL,INTRTC_BCDBUF	; FROM BCD BUF
+	LD	DE,INTRTC_BINBUF	; TO BIN BUF
 	HB_DI
-	CALL	TIMRTC_BCD2BIN		; COPY AND CONVERT
+	CALL	INTRTC_BCD2BIN		; COPY AND CONVERT
 	HB_EI
 ;
 	XOR	A			; SIGNAL SUCCESS
@@ -114,108 +121,108 @@ TIMRTC_SETTIM:
 ;
 ; HANDLER FOR TIMER SECONDS INTERRUPT
 ;
-TIMRTC_INT:
-	LD	HL,TIMRTC_BINBUF + TIMRTC_BUFSIZ - 1
+INTRTC_INT:
+	LD	HL,INTRTC_BINBUF + INTRTC_BUFSIZ - 1
 	INC	(HL)			; INC SECONDS
 	LD	A,59			; MAX VALUE
 	CP	(HL)			; OVERFLOW?
-	JR	NC,TIMRTC_INTX		; NOPE, DONE
+	JR	NC,INTRTC_INTX		; NOPE, DONE
 	LD	(HL),0			; BACK TO ZERO
 
 	DEC	HL			; POINT TO MINUTES
 	INC	(HL)			; INCREMENT MINUTE
 	CP	(HL)			; OVERFLOW?
-	JR	NC,TIMRTC_INTX		; NOPE, DONE
+	JR	NC,INTRTC_INTX		; NOPE, DONE
 	LD	(HL),0			; BACK TO ZERO
 
 	DEC	HL			; POINT TO HOURS
 	INC	(HL)			; INCREMENT HOURS
 	LD	A,23			; MAX VALUE
 	CP	(HL)			; OVERFLOW?
-	JR	NC,TIMRTC_INTX		; NOPE, DONE
+	JR	NC,INTRTC_INTX		; NOPE, DONE
 	LD	(HL),0			; BACK TO ZERO
 
 	DEC	HL			; POINT TO DATE
-	LD	A,(TIMRTC_MO)		; GET CURRENT MONTH
+	LD	A,(INTRTC_MO)		; GET CURRENT MONTH
 	DEC	A			; ZERO OFFSET
-	LD	DE,TIMRTC_MONTBL	; POINT TO DAYS IN MON TBL
+	LD	DE,INTRTC_MONTBL	; POINT TO DAYS IN MON TBL
 	ADD	A,E			; ADD OFFSET
 	LD	E,A			; BACK TO E
-	JR	NC,TIMRTC_INT1		; NO CARRY, SKIP
+	JR	NC,INTRTC_INT1		; NO CARRY, SKIP
 	INC	D			; HANDLE CARRY
-TIMRTC_INT1:
+INTRTC_INT1:
 	LD	A,(DE)			; A := DAYS IN MONTH
 	LD	C,A			; COPY TO C FOR LATER
-	LD	A,(TIMRTC_MO)		; GET CURRENT MONTH
+	LD	A,(INTRTC_MO)		; GET CURRENT MONTH
 	CP	2			; FEBRUARY?
-	JR	NZ,TIMRTC_INT2		; IF NOT, NOT LEAY, SKIP
-	LD	A,(TIMRTC_YR)		; GET CURRENT YEAR
+	JR	NZ,INTRTC_INT2		; IF NOT, NOT LEAY, SKIP
+	LD	A,(INTRTC_YR)		; GET CURRENT YEAR
 	AND	$03			; CHECK FOR LEAP
-	JR	NZ,TIMRTC_INT2		; IF NOT LEAP, SKIP AHEAD
+	JR	NZ,INTRTC_INT2		; IF NOT LEAP, SKIP AHEAD
 	INC	C			; BUMP DAYS IN FEB FOR LEAP
-TIMRTC_INT2:
+INTRTC_INT2:
 	INC	(HL)			; INCREMENT DATE
 	LD	A,C			; A := TRUE DAYS IN MONTH + 1
 	CP	(HL)			; OVERFLOW?
-	JR	NZ,TIMRTC_INTX		; NOPE, DONE
+	JR	NZ,INTRTC_INTX		; NOPE, DONE
 	LD	(HL),1			; BACK TO DAY ONE
 
 	DEC	HL			; POINT TO MONTH
 	INC	(HL)			; INCREMENT MONTH
 	LD	A,13			; PAST MAX?
 	CP	(HL)			; OVERFLOW?
-	JR	NZ,TIMRTC_INTX		; NOPE, DONE
+	JR	NZ,INTRTC_INTX		; NOPE, DONE
 	LD	(HL),1			; BACK TO MONTH ONE
 
 	DEC	HL			; POINT TO YEAR
 	INC	(HL)			; INCREMENT YEAR
 	LD	A,100			; PAST MAX?
 	CP	(HL)			; OVERFLOW?
-	JR	NZ,TIMRTC_INTX		; NOPE, DONE
+	JR	NZ,INTRTC_INTX		; NOPE, DONE
 	LD	(HL),0			; BACK TO YEAR ZERO
-TIMRTC_INTX:
+INTRTC_INTX:
 	JP	PANIC
-TIMRTC_VEC	.EQU	$-2
+INTRTC_VEC	.EQU	$-2
 ;
 ; CONVERT FROM BINARY BUF (HL) TO BCD BUF (DE)
 ;
-TIMRTC_BIN2BCD:
-	LD	B,TIMRTC_BUFSIZ
-TIMRTC_BIN2BCD1:
+INTRTC_BIN2BCD:
+	LD	B,INTRTC_BUFSIZ
+INTRTC_BIN2BCD1:
 	LD	A,(HL)
 	CALL	BYTE2BCD
 	LD	(DE),A
 	INC	HL
 	INC	DE
-	DJNZ	TIMRTC_BIN2BCD1
+	DJNZ	INTRTC_BIN2BCD1
 	RET
 ;
 ; CONVERT FROM BCD BUF (HL) TO BINARY BUF (DE)
 ;
-TIMRTC_BCD2BIN
-	LD	B,TIMRTC_BUFSIZ
-TIMRTC_BCD2BIN1:
+INTRTC_BCD2BIN
+	LD	B,INTRTC_BUFSIZ
+INTRTC_BCD2BIN1:
 	LD	A,(HL)
 	CALL	BCD2BYTE
 	LD	(DE),A
 	INC	HL
 	INC	DE
-	DJNZ	TIMRTC_BCD2BIN1
+	DJNZ	INTRTC_BCD2BIN1
 	RET
 ;
 ; WORKING VARIABLES
 ;
-TIMRTC_BINBUF:	; ALL IN BINARY
-TIMRTC_YR	.DB	20
-TIMRTC_MO	.DB	01
-TIMRTC_DT	.DB	01
-TIMRTC_HH	.DB	00
-TIMRTC_MM	.DB	00
-TIMRTC_SS	.DB	00
+INTRTC_BINBUF:	; ALL IN BINARY
+INTRTC_YR	.DB	20
+INTRTC_MO	.DB	01
+INTRTC_DT	.DB	01
+INTRTC_HH	.DB	00
+INTRTC_MM	.DB	00
+INTRTC_SS	.DB	00
 ;
-TIMRTC_BCDBUF	.FILL	TIMRTC_BUFSIZ
+INTRTC_BCDBUF	.FILL	INTRTC_BUFSIZ
 ;
-TIMRTC_MONTBL:	; DAYS IN MONTH + 1
+INTRTC_MONTBL:	; DAYS IN MONTH + 1
 		.DB	32	; JANUARY
 		.DB	29	; FEBRUARY (NON-LEAP)
 		.DB	32	; MARCH
diff --git a/Source/HBIOS/simrtc.asm b/Source/HBIOS/simrtc.asm
index 33c79590..8be545c3 100644
--- a/Source/HBIOS/simrtc.asm
+++ b/Source/HBIOS/simrtc.asm
@@ -11,6 +11,10 @@ SIMRTC_BUFSIZ	.EQU	6	; SIX BYTE BUFFER (YYMMDDHHMMSS)
 ; RTC DEVICE INITIALIZATION ENTRY
 ;
 SIMRTC_INIT:
+	LD	A,(RTC_DISPACT)		; RTC DISPATCHER ALREADY SET?
+	OR	A			; SET FLAGS
+	RET	NZ			; IF ALREADY ACTIVE, ABORT
+;
 	CALL	NEWLINE			; FORMATTING
 	PRTS("SIMRTC: $")
 ;
@@ -20,6 +24,9 @@ SIMRTC_INIT:
 	CALL	SIMRTC_GETTIM0
 	POP	HL
 	CALL	PRTDT
+;
+	LD	BC,SIMRTC_DISPATCH
+	CALL	RTC_SETDISP
 ;
 	XOR	A		; SIGNAL SUCCESS
 	RET
diff --git a/Source/ReadMe.txt b/Source/ReadMe.txt
index fd6b5ae0..1bffa121 100644
--- a/Source/ReadMe.txt
+++ b/Source/ReadMe.txt
@@ -67,7 +67,7 @@ Note that steps 1 and 2 are performed to customize your ROM as
 desired.  If you want to simply build a standard configuration, it is 
 *not* necessary to perform steps 1 or 2 before running a build.  In 
 fact, I strongly recommend that you skip steps 1 and 2 initially and 
-just perform perform steps 3 and 4 using the standard configuraion to 
+just perform perform steps 3 and 4 using the standard configuration to 
 make sure that you have no issues building and programming a ROM that 
 works the same as a pre-built ROM.
 
@@ -76,7 +76,7 @@ Each of the 4 steps above is described in more detail below.
 1. Create/Update Configuration File
 -----------------------------------
 
-The options for a build are primarily controled by a configuration 
+The options for a build are primarily controlled by a configuration 
 file that is included in the build process.  In order to customize 
 your settings, it is easiest to make a copy of an existing 
 configuration file and make your changes there.
@@ -87,7 +87,7 @@ series of files named <plt>_<cfg>.asm where <plt> refers to the
 CPU board in your system and <cfg> is used to name the specific 
 configuration so you can maintain multiple configurations.
 
-You will notice that there is generaly one configuration file for 
+You will notice that there is generally one configuration file for 
 each CPU platform with a name of "std".  For example, you there is 
 a file called MK4_std.asm.  This is the standard ("std") 
 configuration for a Mark IV CPU board.
@@ -148,7 +148,7 @@ These directories are already populated in the distribution.  You do
 not need to do anything unless you want to change the files that are 
 included in the ROM Disk.
 
-In summary, the ROM Disk imbedded in the ROM firmware you build, 
+In summary, the ROM Disk embedded in the ROM firmware you build, 
 will include the files from the ROM_512KB directory (or the 
 ROM_1024KB directory if building a 1024KB firmware).  
 Additionally, files will be added from the directory associated