diff --git a/Doc/RomWBW Applications.pdf b/Doc/RomWBW Applications.pdf
index 275b6797..b57c4e8a 100644
Binary files a/Doc/RomWBW Applications.pdf and b/Doc/RomWBW Applications.pdf differ
diff --git a/Doc/RomWBW Architecture.pdf b/Doc/RomWBW Architecture.pdf
index 468e8fde..4e93b2ea 100644
Binary files a/Doc/RomWBW Architecture.pdf and b/Doc/RomWBW Architecture.pdf differ
diff --git a/Doc/RomWBW Disk Catalog.pdf b/Doc/RomWBW Disk Catalog.pdf
index f5f33b31..4d92d17f 100644
Binary files a/Doc/RomWBW Disk Catalog.pdf and b/Doc/RomWBW Disk Catalog.pdf differ
diff --git a/Doc/RomWBW Getting Started.pdf b/Doc/RomWBW Getting Started.pdf
index 225e2dda..bd96edbd 100644
Binary files a/Doc/RomWBW Getting Started.pdf and b/Doc/RomWBW Getting Started.pdf differ
diff --git a/ReadMe.md b/ReadMe.md
index a37f7228..7680b0e8 100644
--- a/ReadMe.md
+++ b/ReadMe.md
@@ -3,7 +3,7 @@
 ## Z80/Z180 System Software
 
 Version 3.1 Pre-release  
-Saturday 16 May 2020
+Tuesday 19 May 2020
 
 Wayne Warthen <wwarthen@gmail.com>
 
@@ -706,6 +706,10 @@ most stable and you are less likely to encounter problems.
 
 ### Notes
 
+  - You can change media, but it must be done while at the OS command
+    prompt and you **must** warm start CP/M by pressing ctrl-c. This is
+    a CP/M 2.2 constraint and is well documented in the DRI manuals.
+
   - The original versions of DDT, DDTZ, and ZSID used the RST 38 vector
     which conflicts with interrupt mode 1 use of this vector. The DDT,
     DDTZ, and ZSID applications in RomWBW have been modified to use RTS
@@ -735,6 +739,10 @@ Manual.pdf”).
     of the ZSDOS paths and will fail in some scenarios (use `COPY`
     instead).
 
+  - Although ZSDOS can recognize a media change in some cases, it will
+    not always work. You should only change media at a command prompt
+    and be sure to warm start the OS with a ctrl-c.
+
 ## NZCOM Automatic Z-System
 
 NZCOM is a much further refined version of Z-System (ZCPR 3.4). NZCOM
@@ -775,10 +783,16 @@ tracks. `CPMLDR.SYS` chain loads `CPM3.SYS`.
     used to read the current date/time for file stamping, etc. You can
     use the `RTC` app to set the RTC clock.
 
-  - The `COPYSYS` command described in the DRI CP/M 3 documentatin is
+  - The `COPYSYS` command described in the DRI CP/M 3 documentation is
     not provided with RomWBW. The RomWBW `SYSCOPY` command is used
     instead.
 
+  - Although CP/M 3 is generally able to run CP/M 2.2 programs, this is
+    not universally true. This is especially true of the utility
+    programs included with the operating system. For example, the
+    `SUBMIT` program of CP/M 3 is completely different from the `SUBMIT`
+    program of CP/M 2.2.
+
 ## Simeon Cran’s ZPM3
 
 ZPM3 is an interesting combination of the features of both CP/M 3 and
@@ -792,8 +806,9 @@ tracks of the disk.
   - `ZPMLDR` is included with ZPM3, but it is not working correctly.
 
   - The ZPM operating system is contained in the file called CPM3.SYS
-    which is confusing, but it is the author’s intended way of using
-    ZPM3.
+    which is confusing, but this is as intended by the ZPM3
+    distribution. I believe it was done this way to make it easier for
+    users to transition from CP/M 3 to ZPM3.
 
 ## FreeRTOS
 
diff --git a/ReadMe.txt b/ReadMe.txt
index 81a3de1e..d7c946d6 100644
--- a/ReadMe.txt
+++ b/ReadMe.txt
@@ -3,7 +3,7 @@ RomWBW
 Z80/Z180 System Software
 
 Version 3.1 Pre-release
-Saturday 16 May 2020
+Tuesday 19 May 2020
 
 Wayne Warthen wwarthen@gmail.com
 
@@ -737,6 +737,10 @@ most stable and you are less likely to encounter problems.
 
 Notes
 
+-   You can change media, but it must be done while at the OS command
+    prompt and you must warm start CP/M by pressing ctrl-c. This is a
+    CP/M 2.2 constraint and is well documented in the DRI manuals.
+
 -   The original versions of DDT, DDTZ, and ZSID used the RST 38 vector
     which conflicts with interrupt mode 1 use of this vector. The DDT,
     DDTZ, and ZSID applications in RomWBW have been modified to use RTS
@@ -764,6 +768,10 @@ Notes
     of the ZSDOS paths and will fail in some scenarios (use COPY
     instead).
 
+-   Although ZSDOS can recognize a media change in some cases, it will
+    not always work. You should only change media at a command prompt
+    and be sure to warm start the OS with a ctrl-c.
+
 NZCOM Automatic Z-System
 
 NZCOM is a much further refined version of Z-System (ZCPR 3.4). NZCOM
@@ -804,9 +812,15 @@ Notes
     to read the current date/time for file stamping, etc. You can use
     the RTC app to set the RTC clock.
 
--   The COPYSYS command described in the DRI CP/M 3 documentatin is not
+-   The COPYSYS command described in the DRI CP/M 3 documentation is not
     provided with RomWBW. The RomWBW SYSCOPY command is used instead.
 
+-   Although CP/M 3 is generally able to run CP/M 2.2 programs, this is
+    not universally true. This is especially true of the utility
+    programs included with the operating system. For example, the SUBMIT
+    program of CP/M 3 is completely different from the SUBMIT program of
+    CP/M 2.2.
+
 Simeon Cran’s ZPM3
 
 ZPM3 is an interesting combination of the features of both CP/M 3 and
@@ -820,8 +834,9 @@ Notes
 -   ZPMLDR is included with ZPM3, but it is not working correctly.
 
 -   The ZPM operating system is contained in the file called CPM3.SYS
-    which is confusing, but it is the author’s intended way of using
-    ZPM3.
+    which is confusing, but this is as intended by the ZPM3
+    distribution. I believe it was done this way to make it easier for
+    users to transition from CP/M 3 to ZPM3.
 
 FreeRTOS
 
diff --git a/Source/CBIOS/cbios.asm b/Source/CBIOS/cbios.asm
index 47018547..6d2c1a9b 100644
--- a/Source/CBIOS/cbios.asm
+++ b/Source/CBIOS/cbios.asm
@@ -2103,6 +2103,7 @@ INIT:
 
 	; SOFT RESET HBIOS
 	LD	B,BF_SYSRESET		; HB FUNC: RESET
+	LD	C,BF_SYSRES_INT		; WARM START
 	RST	08			; DO IT
 
 	; CREATE A TEMP COPY OF THE HBIOS CONFIG BLOCK (HCB)
diff --git a/Source/CPM3/biosldr.z80 b/Source/CPM3/biosldr.z80
index beeeb878..ed478b2d 100644
--- a/Source/CPM3/biosldr.z80
+++ b/Source/CPM3/biosldr.z80
@@ -59,7 +59,7 @@ boot:
 	; this routine to avoid issues.
 	ld	(stksav),sp
 	ld	sp,stack
-
+	
 	; Do the real work
 	call	boot0
 
@@ -718,10 +718,20 @@ medid	ds	1	; media id
 lba	ds	4	; current lba
 sps	ds	2	; sectors per slice
 
-csvbuf	ds	128	; length (CSV) = ((DRM+1)/4)
-alvbuf	ds	512	; length (ALV) = ((DSM+1)/4)
-dirbuf	ds	512	; sector buffer
-dtabuf	ds	512	; sector buffer
+;csvbuf	ds	128	; length (CSV) = ((DRM+1)/4)
+;alvbuf	ds	512	; length (ALV) = ((DSM+1)/4)
+;dirbuf	ds	512	; sector buffer
+;dtabuf	ds	512	; sector buffer
+
+; Trying to save space.  The loader must fit underneath
+; the start of BNKBDOS3 and we have a big BNKBDOS because
+; of all the disk allocations.  Putting these buffers
+; in upper memory actually helps quite a bit.
+
+csvbuf	equ	8000h
+alvbuf	equ	csvbuf + 128
+dirbuf	equ	alvbuf + 512
+dtabuf	equ	dirbuf + 512
 
 	ds	64
 stack	equ	$
diff --git a/Source/Doc/Applications.md b/Source/Doc/Applications.md
index 236b02e2..463ed760 100644
--- a/Source/Doc/Applications.md
+++ b/Source/Doc/Applications.md
@@ -360,7 +360,7 @@ message.
 
 ## Etymology
 
-The `SYSCOPY` command is an original product and the source code is
+The `MODE` command is an original product and the source code is
 provided in the RomWBW distribution.
 
 `\clearpage`{=latex}
diff --git a/Source/Doc/Architecture.md b/Source/Doc/Architecture.md
index cb6b9807..6260d673 100644
--- a/Source/Doc/Architecture.md
+++ b/Source/Doc/Architecture.md
@@ -428,7 +428,7 @@ _Code_ | _Meaning_
 -7     | media not present
 -8     | hardware not present
 -9     | I/O error
--10    | write request to read-only media
+-10    | write request to read-only media	
 -11    | device timeout
 -12    | invalid configuration
 
@@ -1565,7 +1565,7 @@ the value of the subfucntion.  See subfunctions below.
 #### SYSRESET Subfunction 0x00 -- Internal HBIOS Reset (RESINT)
 
 |      _Entry Parameters_
-|           BC: 0xF000
+|           BC: 0xFD00
 
 |      _Returned Values_
 |           A: Status (0=OK, else error)
@@ -1576,7 +1576,7 @@ current OS. Does not reinitialize physical devices.
 #### SYSRESET Subfunction 0x01 -- Warm Start System (RESWARM)
 
 |      _Entry Parameters_
-|           BC: 0xF001
+|           BC: 0xFD01
 
 |      _Returned Values_
 |           <none>
@@ -1587,7 +1587,7 @@ reinitialize physical devices.
 #### SYSRESET Subfunction 0x02 -- Cold Start System (RESCOLD)
 
 |      _Entry Parameters_
-|           BC: 0xF002
+|           BC: 0xFD02
 
 |      _Returned Values_
 |           <none>
diff --git a/Source/Doc/GettingStarted.md b/Source/Doc/GettingStarted.md
index f63ef2e3..2e6820da 100644
--- a/Source/Doc/GettingStarted.md
+++ b/Source/Doc/GettingStarted.md
@@ -755,6 +755,11 @@ likely to encounter problems.
 
 ### Notes
 
+- You can change media, but it must be done while at the OS
+command prompt and you **must** warm start CP/M by pressing
+ctrl-c.  This is a CP/M 2.2 constraint and is well documented
+in the DRI manuals.
+
 - The original versions of DDT, DDTZ, and ZSID used the RST 38
 vector which conflicts with interrupt mode 1 use of this vector.
 The DDT, DDTZ, and ZSID applications in RomWBW have been modified
@@ -783,6 +788,10 @@ Manual.pdf").
 may not work as expected.  The best example is PIP which is not aware
 of the ZSDOS paths and will fail in some scenarios (use `COPY` instead).
 
+- Although ZSDOS can recognize a media change in some cases, it will not
+always work.  You should only change media at a command prompt and be
+sure to warm start the OS with a ctrl-c.
+
 ## NZCOM Automatic Z-System
 
 NZCOM is a much further refined version of Z-System (ZCPR 3.4). NZCOM
@@ -823,9 +832,14 @@ system tracks.  `CPMLDR.SYS` chain loads `CPM3.SYS`.
 used to read the current date/time for file stamping, etc.  You can
 use the `RTC` app to set the RTC clock.
 
-- The `COPYSYS` command described in the DRI CP/M 3 documentatin is
+- The `COPYSYS` command described in the DRI CP/M 3 documentation is
 not provided with RomWBW.  The RomWBW `SYSCOPY` command is used instead.
 
+- Although CP/M 3 is generally able to run CP/M 2.2 programs, this is
+not universally true.  This is especially true of the utility programs
+included with the operating system.  For example, the `SUBMIT` program
+of CP/M 3 is completely different from the `SUBMIT` program of CP/M 2.2.
+
 ## Simeon Cran's ZPM3
 
 ZPM3 is an interesting combination of the features of both CP/M 3 and
@@ -840,7 +854,9 @@ tracks of the disk.
 - `ZPMLDR` is included with ZPM3, but it is not working correctly.
 
 - The ZPM operating system is contained in the file called CPM3.SYS
-which is confusing, but it is the author's intended way of using ZPM3.
+which is confusing, but this is as intended by the ZPM3 distribution.
+I believe it was done this way to make it easier for users to transition
+from CP/M 3 to ZPM3.
 
 ## FreeRTOS
 
diff --git a/Source/HBIOS/dbgmon.asm b/Source/HBIOS/dbgmon.asm
index 24a9f26a..69016865 100644
--- a/Source/HBIOS/dbgmon.asm
+++ b/Source/HBIOS/dbgmon.asm
@@ -1400,7 +1400,7 @@ DISPLAYBUF:	.FILL	8,0
 #ELSE
 ;
 DSKY_ENTRY:
-	CALL	PANIC		; NO RETURN
+	JP	EXIT
 ;
 #ENDIF
 ;
diff --git a/Source/HBIOS/hbios.asm b/Source/HBIOS/hbios.asm
index a172f71d..0e6d78c4 100644
--- a/Source/HBIOS/hbios.asm
+++ b/Source/HBIOS/hbios.asm
@@ -215,6 +215,8 @@ CB_SERDEV	.DB	0		; PRIMARY SERIAL UNIT IS UNIT #0 BY FIAT
 CB_CRTDEV	.DB	$FF		; PRIMARY CRT UNIT, $FF UNTIL AFTER HBIOS INIT
 CB_CONDEV	.DB	$FF		; CONSOLE UNIT, $FF UNTIL AFTER HBIOS INIT
 ;
+CB_DIAGLVL	.DB	DIAGLVL		; ROMWBW HBIOS DIAGNOSTIC LEVEL
+;
 ; MEMORY MANAGEMENT VARIABLES START AT $20
 ;
 		.FILL	(HCB + $20 - $),0
@@ -2950,13 +2952,13 @@ HB_DISPCALL:
 	; CHECK INCOMING UNIT INDEX IN C FOR VAILIDITY
 	LD	A,C			; A := INCOMING DISK UNIT INDEX
 	CP	(IY-1)			; COMPARE TO COUNT
-	JR	NC,HB_FUNCERR		; HANDLE INVALID UNIT INDEX
+	JR	NC,HB_UNITERR		; HANDLE INVALID UNIT INDEX
 
 	; CHECK FUNCTION INDEX FOR VALIDITY
 	LD	A,B			; A := INCOMING FUNCTION NUMBER
 	AND	$0F			; LOW NIBBLE ONLY FOR FUNC INDEX
 	CP	(IY-3)			; CHECK FN NUM AGAINST MAX
-	JR	NC,HB_UNITERR		; HANDLE FN NUM OUT OF RANGE ERROR
+	JR	NC,HB_FUNCERR		; HANDLE FN NUM OUT OF RANGE ERROR
 
 	; BUMP IY TO ACTUAL XXX_TBL ENTRY FOR INCOMING UNIT INDEX
 	PUSH	BC			; SAVE BC
@@ -3548,6 +3550,69 @@ HB_RDSEC:
 ;
 #ENDIF
 ;
+; SYSTEM CHECK: DUMP MACHINE STATE AND CONTINUE?
+;
+SYSCHK:
+	; CHECK DIAG LEVEL TO SEE IF WE SHOULD DISPLAY
+	PUSH	AF			; PRESERVE INCOMING AF VALUE
+	LD	A,(CB_DIAGLVL)		; GET DIAGNOSTIC LEVEL
+	CP	DL_ERROR		; >= ERROR LEVEL
+	JR	C,SYSCHK1		; IF NOT, GO HOME
+	POP	AF			; RESTORE INCOMING AF VALUE
+;	
+	; DISPLAY SYSCHK MESSAGE
+	PUSH	DE			; PRESERVE DE VALUE
+	LD	DE,STR_SYSCHK		; POINT TO PREFIX STRING
+	CALL	WRITESTR		; PRINT IT
+	POP	DE			; RESTORE DE VALUE
+	CALL	XREGDMP			; DUMP REGISTERS
+	JR	CONTINUE		; CHECK W/ USER
+;
+SYSCHK1:
+	; RETURN IF MESSAGING BYPASSED BY DIAG LEVEL
+	POP	AF
+	RET
+;
+; PANIC: DUMP MACHINE STATE AND HALT
+;
+PANIC:
+	PUSH	DE
+	LD	DE,STR_PANIC
+	CALL	WRITESTR
+	POP	DE
+	CALL	XREGDMP			; DUMP REGISTERS
+	JR	SYSHALT			; FULL STOP
+;
+;
+;
+CONTINUE:
+	PUSH	AF
+CONTINUE1:
+	PUSH	DE
+	LD	DE,STR_CONTINUE
+	CALL	WRITESTR
+	POP	DE
+	CALL	CIN
+	RES	5,A			; FORCE UPPERCASE (IMPERFECTLY)
+	CALL	COUT			; ECHO
+	CP	'Y'
+	JR	Z,CONTINUE3
+	CP	'N'
+	JR	Z,SYSHALT
+	JR	CONTINUE1
+CONTINUE3:
+	CALL	NEWLINE
+	POP	AF
+	RET
+;
+;
+;
+SYSHALT:
+	LD	DE,STR_HALT
+	CALL	WRITESTR
+	DI
+	HALT
+;
 ; PRINT VALUE OF HL AS THOUSANDTHS, IE. 0.000
 ;
 PRTD3M:
@@ -4289,6 +4354,10 @@ STR_SWITCH	.DB	"*** Activating CRT Console ***$"
 STR_BADINT	.DB	"\r\n*** BAD INT ***\r\n$"
 STR_LOWBAT	.DB	"\r\n\r\n+++ LOW BATTERY +++$"
 ;
+STR_PANIC	.TEXT	"\r\n>>> PANIC: $"
+STR_SYSCHK	.TEXT	"\r\n>>> SYSCHK: $"
+STR_CONTINUE	.TEXT	"\r\nContinue (Y/N)? $"
+;
 #IF (DSKYENABLE)	;	'H','B','I','O',' ',' ',' ',' '
 MSG_HBVER		.DB	$BE,$FF,$8A,$FB,$80,$80,$80,$80	; "HBIO    "
 #ENDIF
diff --git a/Source/HBIOS/hbios.inc b/Source/HBIOS/hbios.inc
index 491f2422..3c131c6f 100644
--- a/Source/HBIOS/hbios.inc
+++ b/Source/HBIOS/hbios.inc
@@ -121,7 +121,7 @@ CIO_CONSOLE		.EQU	$80	; CIO UNIT NUM FOR CUR CON
 ERR_NONE		.EQU	0	; SUCCESS
 ;
 ERR_UNDEF		.EQU	-1	; UNDEFINED ERROR
-ERR_NOTIMPL		.EQU	-2	; FUNC NOT IMPLEMENTED
+ERR_NOTIMPL		.EQU	-2	; FUNCTION NOT IMPLEMENTED
 ERR_NOFUNC		.EQU	-3	; INVALID FUNCTION
 ERR_NOUNIT		.EQU	-4	; INVALID UNIT NUMBER
 ERR_NOMEM		.EQU	-5	; OUT OF MEMORY
@@ -129,7 +129,7 @@ ERR_RANGE		.EQU	-6	; PARAMETER OUT OF RANGE
 ERR_NOMEDIA		.EQU	-7	; MEDIA NOT PRESENT
 ERR_NOHW		.EQU	-8	; HARDWARE NOT PRESENT
 ERR_IO			.EQU	-9	; I/O ERROR
-ERR_READONLY		.EQU	-10	; WRITE REQ TO READ-ONLY MEDIA	
+ERR_READONLY		.EQU	-10	; WRITE REQUEST TO READ-ONLY MEDIA	
 ERR_TIMEOUT		.EQU	-11	; DEVICE TIMEOUT
 ERR_BADCFG		.EQU	-12	; INVALID CONFIGURATION
 ERR_INTERNAL		.EQU	-13	; INTERNAL ERROR
@@ -220,8 +220,7 @@ HCB_BOOTBID	.EQU	$0F		; BANK ID OF ROM PAGE BOOTED (BYTE)
 HCB_SERDEV	.EQU	$10		; PRIMARY SERIAL DEVICE/UNIT (BYTE)
 HCB_CRTDEV	.EQU	$11		; CRT DISPLAY DEVICE/UNIT (BYTE)
 HCB_CONDEV	.EQU	$12		; ACTIVE CONSOLE DEVICE/UNIT (BYTE)
-;HCB_CUREMU	.EQU	$13		; CURRENT VDA TERMINAL EMULATION (DEPRECATED)
-;HCB_CURVDA	.EQU	$14		; CURRENT VDA TARGET FOR EMULATION (DEPRECATED)
+HCB_DIAGLVL	.EQU	$13		; HBIOS DIAGNOSTIC LEVEL (BYTE)
 ;
 HCB_HEAP	.EQU	$20		; DWORD ADDRESS OF START OF HEAP
 HCB_HEAPTOP	.EQU	$22		; DWORD ADDRESS OF TOP OF HEAP
diff --git a/Source/HBIOS/romldr.asm b/Source/HBIOS/romldr.asm
index f17704ee..9e0bf162 100644
--- a/Source/HBIOS/romldr.asm
+++ b/Source/HBIOS/romldr.asm
@@ -285,6 +285,8 @@ runcmd:
 #if (BIOS == BIOS_WBW)
 	cp	'I'			; C = set console interface
 	jp	z,setcon		; if so, do it
+	cp	'V'			; V = diagnostic verbosity
+	jp	z,setdl			; is so, do it
 #endif
 ;
 	; Attempt ROM application launch
@@ -473,6 +475,44 @@ setcon:
 ;
 #endif
 ;
+; Set RomWBW HBIOS Diagnostic Level
+;
+#if (BIOS == BIOS_WBW)
+;
+setdl:
+	; On entry DE is expected to be pointing to start
+	; of command
+	call	findws			; skip command
+	call	skipws			; and skip it
+	or	a			; set flags to check for null
+	jr	z,showdl		; no parm, just display
+	call	isnum			; do we have a number?
+	jp	nz,err_invcmd		; if not, invalid
+	call	getnum			; parse number into A
+	jp	c,err_invcmd		; handle overflow error
+;
+	; Set diagnostic level
+	ld	b,BF_SYSPOKE		; HBIOS func: POKE
+	ld	d,BID_BIOS		; BIOS bank
+	ld	e,a			; diag level value
+	ld	hl,HCB_LOC + HCB_DIAGLVL	; offset into HCB
+	rst	08			; do it
+	; Fall thru to display new value
+;
+showdl:
+	; Display current diagnostic level
+	ld	hl,str_diaglvl		; diag level tag
+	call	pstr			; print it
+	ld	b,BF_SYSPEEK		; HBIOS func: PEEK
+	ld	d,BID_BIOS		; BIOS bank
+	ld	hl,HCB_LOC + HCB_DIAGLVL	; offset into HCB
+	rst	08			; do it, E := level value
+	ld	a,e			; put in accum
+	call	prtdecb			; print it
+	ret				; done
+;
+#endif
+;
 ; Restart system
 ;
 reboot:
@@ -1079,6 +1119,8 @@ rdln_cr:
 ;
 findws:
 	ld	a,(de)			; get next char
+	or	a			; check for eol
+	ret	z			; done if so
 	cp	' '			; blank?
 	ret	z			; nope, done
 	inc	de			; bump buffer pointer
@@ -1089,6 +1131,8 @@ findws:
 ;
 skipws:
 	ld	a,(de)			; get next char
+	or	a			; check for eol
+	ret	z			; done if so
 	cp	' '			; blank?
 	ret	nz			; nope, done
 	inc	de			; bump buffer pointer
@@ -1740,6 +1784,7 @@ devunk		.db	"UNK",0
 err_invcmd:
 	ld	hl,str_err_invcmd
 	jr	err
+;
 err_nodisk:
 	ld	hl,str_err_nodisk
 	jr	err
@@ -1833,6 +1878,7 @@ str_binfo3	.db	"-0x",0
 str_binfo4	.db	", entry @ 0x",0
 str_binfo5	.db	"]",0
 str_ldsec	.db	", Sector 0x",0
+str_diaglvl	.db	"\r\n\r\nHBIOS Diagnostic Level: ",0
 ;
 str_help	.db	"\r\n"
 		.db	"\r\n  L         - List ROM Applications"
@@ -1840,6 +1886,7 @@ str_help	.db	"\r\n"
 		.db	"\r\n  R         - Reboot System"
 #if (BIOS == BIOS_WBW)
 		.db	"\r\n  I <u>     - Set Console Interface"
+		.db	"\r\n  V <n>     - Set HBIOS Diagnostic Verbosity"
 #endif
 		.db	"\r\n  <u>[.<s>] - Boot Disk Unit/Slice"
 		.db	0
diff --git a/Source/HBIOS/std.asm b/Source/HBIOS/std.asm
index a6ee8022..b7459ce3 100644
--- a/Source/HBIOS/std.asm
+++ b/Source/HBIOS/std.asm
@@ -30,9 +30,15 @@ USEXIO		.EQU	1		; BASIC SERIAL DRIVER
 USEMIO		.EQU	2		; MEMORY BUFFER DRIVER
 WBWDEBUG	.EQU	USENONE
 ;
-; DISPLAY SYSTEM CHECKS?
+; DIAGNOSTIC LEVEL OPTIONS
 ;
-SYSCHKENABLE	.EQU	FALSE
+DL_NONE		.EQU	0		; HBIOS DISPLAY NO MESSAGES
+DL_CRITICAL	.EQU	4		; HBIOS DISPLAY CRITICAL ERROR MESSAGES
+DL_ERROR	.EQU	8		; HBIOS DISPLAYS ALL ERROR MESSAGES
+DL_WARNING	.EQU	12		; HBIOS DISPLAYS WARNING MESSAGES
+DL_INFO		.EQU	16		; HBIOS DISPLAYS INFORMATIONAL MESSAGES
+DL_DETAIL	.EQU	20		; HBIOS DISPLAYS DETAILED DIAGNOSTIC MESSAGES
+DL_VERBOSE	.EQU	24		; HBIOS DISPLAYS ANYTHING IT KNOWS HOW TO
 ;
 ; PRIMARY HARDWARE PLATFORMS
 ;
@@ -62,6 +68,11 @@ BIOS_NONE	.EQU	0		; NO BIOS TYPE DEFINED
 BIOS_WBW	.EQU	1		; ROMWBW HBIOS
 BIOS_UNA	.EQU	2		; UNA UBIOS
 ;
+; DEFAULT HBIOS DIAGNOSTIC LEVEL
+;   WILL ULTIMATELY BE MOVED TO CONFIG FILE
+;
+DIAGLVL		.EQU	DL_CRITICAL
+;
 ; MEMORY MANAGERS
 ;
 MM_NONE		.EQU	0
diff --git a/Source/HBIOS/util.asm b/Source/HBIOS/util.asm
index 7a8868dd..d4396495 100644
--- a/Source/HBIOS/util.asm
+++ b/Source/HBIOS/util.asm
@@ -381,30 +381,6 @@ TSTPT:
 	POP	DE
 	JR	REGDMP			; DUMP REGISTERS AND RETURN
 ;
-; SYSTEM CHECK: DUMP MACHINE STATE AND CONTINUE?
-;
-SYSCHK:
-#IF (SYSCHKENABLE)
-	PUSH	DE
-	LD	DE,STR_SYSCHK
-	CALL	WRITESTR
-	POP	DE
-	CALL	XREGDMP			; DUMP REGISTERS
-	CALL	CONTINUE		; CHECK W/ USER
-#ENDIF
-	RET
-;
-; PANIC: DUMP MACHINE STATE AND HALT
-;
-PANIC:
-	PUSH	DE
-	LD	DE,STR_PANIC
-	CALL	WRITESTR
-	POP	DE
-	CALL	XREGDMP			; DUMP REGISTERS
-	DI				; NO INTERRUPTS
-	HALT				; FULL STOP
-;
 ;
 ;
 REGDMP:
@@ -491,35 +467,10 @@ REGDMP_SP	.DW	0
 ;
 ;
 ;
-CONTINUE:
-	PUSH	AF
-	PUSH	DE
-	LD	DE,STR_CONTINUE
-	CALL	WRITESTR
-	POP	DE
-CONTINUE1:
-	CALL	CIN
-	CP	'Y'
-	JR	Z,CONTINUE3
-	CP	'y'
-	JR	Z,CONTINUE3
-	CP	'N'
-	JR	Z,CONTINUE2
-	CP	'n'
-	JR	Z,CONTINUE2
-	JR	CONTINUE1
-CONTINUE2:
-	HALT
-CONTINUE3:
-	POP	AF
-	RET
-;
 ;
 ;
-STR_PANIC	.DB	"\r\n\r\n>>> PANIC: $"
-STR_SYSCHK	.DB	"\r\n\r\n>>> SYSCHK: $"
+STR_HALT	.TEXT	"\r\n\r\n*** System Halted ***$"
 STR_TSTPT	.TEXT	"\r\n+++ TSTPT: $"
-STR_CONTINUE	.TEXT	" Continue? (Y/N): $"
 ;STR_AF		.DB	" AF=$"
 ;STR_BC		.DB	" BC=$"
 ;STR_DE		.DB	" DE=$"
diff --git a/Source/ver.inc b/Source/ver.inc
index 74eae58b..f8b3b588 100644
--- a/Source/ver.inc
+++ b/Source/ver.inc
@@ -2,4 +2,4 @@
 #DEFINE	RMN	1
 #DEFINE	RUP	1
 #DEFINE	RTP	0
-#DEFINE BIOSVER	"3.1.1-pre.11"
+#DEFINE BIOSVER	"3.1.1-pre.12"
diff --git a/Source/ver.lib b/Source/ver.lib
index f0a72730..ffca8b84 100644
--- a/Source/ver.lib
+++ b/Source/ver.lib
@@ -3,5 +3,5 @@ rmn	equ	1
 rup	equ	1
 rtp	equ	0
 biosver	macro
-	db	"3.1.1-pre.11"
+	db	"3.1.1-pre.12"
 	endm