diff --git a/Source/HBIOS/hbios.asm b/Source/HBIOS/hbios.asm
index bcca366c..72d55f97 100644
--- a/Source/HBIOS/hbios.asm
+++ b/Source/HBIOS/hbios.asm
@@ -5635,13 +5635,14 @@ PIO_MODE_STR:	.TEXT	"Output$"
 ; VIDEO DEVICE STRINGS
 ;
 PS_VDSTRREF:
-	.DW	PS_VDVDU, PS_VDCVDU, PS_VDNEC, PS_VDTMS, PS_VDVGA
+	.DW	PS_VDVDU, PS_VDCVDU, PS_VDNEC, PS_VDTMS, PS_VDVGA, PS_VDV9958
 ;
 PS_VDVDU	.TEXT	"VDU$"
 PS_VDCVDU	.TEXT	"CVDU$"
 PS_VDNEC	.TEXT	"NEC$"
 PS_VDTMS	.TEXT	"TMS$"
 PS_VDVGA	.TEXT	"VGA$"
+PS_VDV9958	.TEXT	"V9958-$"
 ;
 ; VIDEO TYPE STRINGS
 ;
diff --git a/Source/HBIOS/hbios.inc b/Source/HBIOS/hbios.inc
index 78678921..ffb6bb9d 100644
--- a/Source/HBIOS/hbios.inc
+++ b/Source/HBIOS/hbios.inc
@@ -200,6 +200,7 @@ VDADEV_CVDU	.EQU	$10		; ECB COLOR VDU - MOS 8563
 VDADEV_NEC	.EQU	$20		; ECB UPD7220 - NEC UPD7220
 VDADEV_TMS	.EQU	$30		; N8 ONBOARD VDA SUBSYSTEM - TMS 9918
 VDADEV_VGA	.EQU	$40		; ECB VGA3 - HITACHI HD6445
+VDADEV_V9958	.EQU	$50		; V9958 VDU
 ;
 ; SOUND DEVICE IDS
 ;
diff --git a/Source/HBIOS/std.asm b/Source/HBIOS/std.asm
index f31412a2..c8e09bf9 100644
--- a/Source/HBIOS/std.asm
+++ b/Source/HBIOS/std.asm
@@ -199,7 +199,8 @@ AYMODE_MSX	.EQU	5		; RC2014 SOUND MODULE REV6 BY ED BRINDLEY ON Z80/Z180 AT MSX
 TMSMODE_NONE	.EQU	0
 TMSMODE_SCG	.EQU	1		; SCG ECB BOARD
 TMSMODE_N8	.EQU	2		; N8 BUILT-IN VIDEO
-TMSMODE_RC	.EQU	3		; RC2014 BUILT-IN VIDEO
+TMSMODE_RC	.EQU	3		; RC2014 TMS9918 VIDEO BOARD
+TMSMODE_RCV9958	.EQU	4		; RC2014 V9958 VIDEO BOARD
 ;
 ; SERIAL DEVICE CONFIGURATION CONSTANTS
 ;
@@ -427,7 +428,7 @@ SYSTIM	.SET	TM_CTC
   #IF (TMSENABLE & (INTMODE == 1))
     #IF (TMSTIMENABLE)
 SYSTIM	.SET	TM_TMS
-	.ECHO	" TMS9918"
+	.ECHO	" TMS9918/V9958"
     #ENDIF
   #ENDIF
 ;
diff --git a/Source/HBIOS/tms.asm b/Source/HBIOS/tms.asm
index 62aab029..44d21d83 100644
--- a/Source/HBIOS/tms.asm
+++ b/Source/HBIOS/tms.asm
@@ -1,5 +1,5 @@
 ;======================================================================
-;	N8 VDU DRIVER FOR SBC PROJECT
+;	TM9918 AND V9958 VDU DRIVER
 ;
 ;	WRITTEN BY: DOUGLAS GOODALL
 ;	UPDATED BY: WAYNE WARTHEN -- 4/7/2013
@@ -19,10 +19,10 @@ TMSCTRL1:       .EQU   1               ; CONTROL BITS
 TMSINTEN:       .EQU   5               ; INTERRUPT ENABLE BIT
 
 #IF TMSTIMENABLE
-	.ECHO	"TMS INTERRUPTS ENABLED\n"
+	.ECHO	"TMS/V9958 INTERRUPTS ENABLED\n"
 #ENDIF
 
-#IF (TMSMODE == TMSMODE_RC)
+#IF ((TMSMODE == TMSMODE_RC) | (TMSMODE == TMSMODE_RCV9958))
 TMS_DATREG	.EQU	$98		; READ/WRITE DATA
 TMS_CMDREG	.EQU	$99		; READ STATUS / WRITE REG SEL
 TMS_PPIA	.EQU	0		; PPI PORT A
@@ -58,14 +58,21 @@ TMS_PPIX	.EQU	0		; PPI CONTROL PORT
 #ENDIF
 ;
 TMS_ROWS	.EQU	24
+
+#IF (TMSMODE == TMSMODE_RCV9958)
+TMS_FNTVADDR	.EQU	$1000		; VRAM ADDRESS OF FONT DATA
+TMS_COLS	.EQU	80
+#ELSE
+TMS_FNTVADDR	.EQU	$0800		; VRAM ADDRESS OF FONT DATA
 TMS_COLS	.EQU	40
+#ENDIF
 ;
 #DEFINE USEFONT8X8
 #DEFINE	TMS_FONT FONT8X8
 ;
 TERMENABLE	.SET	TRUE		; INCLUDE TERMINAL PSEUDODEVICE DRIVER
 ;
-; TMS_IODELAY IS USED TO ADD RECOVERY TIME TO TMS9918 ACCESSES
+; TMS_IODELAY IS USED TO ADD RECOVERY TIME TO TMS9918/V9958 ACCESSES
 ; IF YOU SEE SCREEN CORRUPTION, ADJUST THIS!!!
 ;
 #IF (CPUFAM == CPU_Z180)
@@ -73,7 +80,11 @@ TERMENABLE	.SET	TRUE		; INCLUDE TERMINAL PSEUDODEVICE DRIVER
 #DEFINE		TMS_IODELAY	EX (SP),HL \ EX (SP),HL	; 38 W/S
 #ELSE
 ; BELOW WAS TUNED FOR SBC AT 8MHZ
-#DEFINE		TMS_IODELAY	NOP \ NOP	; 8 W/S
+#IF (TMSMODE == TMSMODE_RCV9958)
+#DEFINE		TMS_IODELAY	NOP \ NOP \ NOP \ NOP \ NOP \ NOP \ NOP ; V9958 NEEDS AT WORST CASE, APPROX 4us (28T) DELAY BETWEEN I/O (WHEN IN TEXT MODE)
+#ELSE
+#DEFINE		TMS_IODELAY	NOP \ NOP ; 8 W/S
+#ENDIF
 #ENDIF
 ;
 ;======================================================================
@@ -101,7 +112,11 @@ TMS_INIT:
 	LD	IY,TMS_IDAT		; POINTER TO INSTANCE DATA
 ;
 	CALL	NEWLINE			; FORMATTING
+#IF (TMSMODE == TMSMODE_RCV9958)
+	PRTS("V9958: IO=0x$")
+#ELSE
 	PRTS("TMS: IO=0x$")
+#ENDIF
 	LD	A,TMS_DATREG
 	CALL	PRTHEXBYTE
 	CALL	TMS_PROBE		; CHECK FOR HW EXISTENCE
@@ -149,12 +164,6 @@ TMS_INIT1:
 ;
 	XOR	A			; SIGNAL SUCCESS
 	RET
-
-#IF TMSTIMENABLE
-	; DISABLE INTERRUPT
-TMS_INT_DIS:
-
-#ENDIF
 ;
 ;======================================================================
 ; TMS DRIVER - VIDEO DISPLAY ADAPTER (VDA) FUNCTIONS
@@ -230,7 +239,11 @@ TMS_VDARES1:	; ENTRY POINT TO AVOID TMS_Z180IO RECURSION
 	RET
 
 TMS_VDADEV:
+#IF (TMSMODE == TMSMODE_RCV9958)
+	LD	D, VDADEV_V9958
+#ELSE
 	LD	D,VDADEV_TMS	; D := DEVICE TYPE
+#ENDIF
 	LD	E,0		; E := PHYSICAL UNIT IS ALWAYS ZERO
 	LD	H,TMSMODE	; H := MODE
 	LD	L,TMS_DATREG	; L := BASE I/O ADDRESS
@@ -366,6 +379,14 @@ TMS_SET:
 ;----------------------------------------------------------------------
 ;
 TMS_WR:
+#IF (TMSMODE == TMSMODE_RCV9958)
+        ; CLEAR R#14 FOR V9958
+        XOR     A
+        OUT     (TMS_CMDREG), A
+        LD      A, $80 | 14
+        OUT     (TMS_CMDREG), A
+#ENDIF
+
 	PUSH	HL
 	SET	6,H			; SET WRITE BIT
 	CALL	TMS_RD
@@ -450,8 +471,8 @@ TMS_CRTINIT2:
 ;----------------------------------------------------------------------
 ;
 TMS_LOADFONT:
-	; SET WRITE ADDRESS TO $800
-	LD	HL,$800
+	; SET WRITE ADDRESS TO TMS_FNTVADDR
+	LD	HL,TMS_FNTVADDR
 	CALL	TMS_WR
 
 #IF USELZSA2
@@ -470,8 +491,8 @@ TMS_LOADFONT:
 	LD	HL,TMS_FONT		; START OF FONT DATA
 #ENDIF
 ;
-	; FILL $800 BYTES FROM FONTDATA
-	LD	DE,$800
+	; FILL TMS_FNTVADDR BYTES FROM FONTDATA
+	LD	DE,TMS_FNTVADDR
 TMS_LOADFONT1:
 	LD	A,(HL)
 	OUT	(TMS_DATREG),A
@@ -532,7 +553,7 @@ TMS_SETCUR0:	; MULT BY 8 FOR FONT INDEX
 	SLA	L			; SHIFT LSB INTO CARRY
 	RL	H			; SHFT MSB FROM CARRY
 	DJNZ	TMS_SETCUR0		; LOOP 3 TIMES
-	LD	DE,$800			; OFFSET TO START OF FONT TABLE
+	LD	DE,TMS_FNTVADDR			; OFFSET TO START OF FONT TABLE
 	ADD	HL,DE			; ADD TO FONT INDEX
 	CALL	TMS_RD			; SETUP TO READ GLYPH
 	LD	B,8			; 8 BYTES
@@ -545,7 +566,7 @@ TMS_SETCUR1:	; READ GLYPH LOOP
 	DJNZ	TMS_SETCUR1		; LOOP FOR 8 BYTES
 ;
 	; NOW WRITE INVERTED GLYPH INTO FONT INDEX 255
-	LD	HL,$800 + (255 * 8)	; LOC OF GLPYPH DATA FOR CHAR 255
+	LD	HL,TMS_FNTVADDR + (255 * 8)	; LOC OF GLPYPH DATA FOR CHAR 255
 	CALL	TMS_WR			; SETUP TO WRITE THE INVERTED GLYPH
 	LD	B,8			; 8 BYTES PER GLYPH
 	LD	HL,TMS_BUF		; POINT TO BUFFER
@@ -891,16 +912,33 @@ TMS_PORTS:
 ; 5S		Fifth sprite (not displayed) detected. Value in FS* is valid.
 ; INT		Set at each screen update, used for interrupts.
 ;
+#IF (TMSMODE == TMSMODE_RCV9958)
 TMS_INIT9918:
+	.DB	$04		; REG 0 - NO EXTERNAL VID, SET M4 = 1
+TMS_INIT9918_REG_1:
+	.DB	$50		; REG 1 - ENABLE SCREEN, SET MODE 1
+	.DB	$03		; REG 2 - PATTERN NAME TABLE := 0
+	.DB	$00		; REG 3 - NO COLOR TABLE
+	.DB	$02		; REG 4 - SET PATTERN GENERATOR TABLE TO (TMS_FNTVADDR -> $1000)
+	.DB	$00		; REG 5 - SPRITE ATTRIBUTE IRRELEVANT
+	.DB	$00		; REG 6 - NO SPRITE GENERATOR TABLE
+	.DB	$F0		; REG 7 - WHITE ON BLACK
+
+	.DB	$88		; REG 8 - COLOUR BUS INPUT, DRAM 64K
+	.DB	$00		; REG 9
+	.DB	$00		; REG 10 - COLOUR TABLE A14-A16 (TMS_FNTVADDR - $1000)
+
+#ELSE ; TMS REGISTER SET
 	.DB	$00		; REG 0 - NO EXTERNAL VID
 TMS_INIT9918_REG_1:
 	.DB	$50		; REG 1 - ENABLE SCREEN, SET MODE 1
 	.DB	$00		; REG 2 - PATTERN NAME TABLE := 0
 	.DB	$00		; REG 3 - NO COLOR TABLE
-	.DB	$01		; REG 4 - SET PATTERN GENERATOR TABLE TO $800
+	.DB	$01		; REG 4 - SET PATTERN GENERATOR TABLE TO (TMS_FNTVADDR -> $0800)
 	.DB	$00		; REG 5 - SPRITE ATTRIBUTE IRRELEVANT
 	.DB	$00		; REG 6 - NO SPRITE GENERATOR TABLE
 	.DB	$F0		; REG 7 - WHITE ON BLACK
+#ENDIF
 ;
 TMS_INIT9918LEN	.EQU	$ - TMS_INIT9918
 ;
@@ -909,6 +947,10 @@ TMS_INIT9918LEN	.EQU	$ - TMS_INIT9918
 TMS_DCNTL	.DB	$00	; SAVE Z180 DCNTL AS NEEDED
 #ENDIF
 
+#IF (TMSMODE == TMSMODE_RCV9958)
+	.ECHO	"V9958 instance data occupies "
+#ELSE
 	.ECHO	"TMS instance data occupies "
+#ENDIF
 	.ECHO	$ - TMS_IDAT
 	.ECHO	" bytes\n"