diff --git a/Source/HBIOS/hbios.asm b/Source/HBIOS/hbios.asm
index 04671baa..da00ccd0 100644
--- a/Source/HBIOS/hbios.asm
+++ b/Source/HBIOS/hbios.asm
@@ -773,8 +773,8 @@ HBX_INTSTK	.EQU	$
 ; 1	CTC0B		INT2  |
 ; 2	CTC0C		TIM0  |
 ; 3	CTC0D		TIM1  |
-; 4			DMA0  +- Z180 INTERNAL
-; 5			DMA1  |
+; 4	UART0		DMA0  +- Z180 INTERNAL
+; 5	UART1		DMA1  |
 ; 6			CSIO  |
 ; 7	SIO0		SER0  |
 ; 8	SIO1		SER1 -+
diff --git a/Source/HBIOS/std.asm b/Source/HBIOS/std.asm
index c40f87de..1585f4e8 100644
--- a/Source/HBIOS/std.asm
+++ b/Source/HBIOS/std.asm
@@ -637,6 +637,8 @@ INT_CTC0A	.EQU	0	; ZILOG CTC 0, CHANNEL A
 INT_CTC0B	.EQU	1	; ZILOG CTC 0, CHANNEL B
 INT_CTC0C	.EQU	2	; ZILOG CTC 0, CHANNEL C
 INT_CTC0D	.EQU	3	; ZILOG CTC 0, CHANNEL D
+INT_UART0	.EQU	4	; MBC UART 0
+INT_UART1	.EQU	5	; MBC UART 1
 INT_SIO0	.EQU	7	; ZILOG SIO 0, CHANNEL A & B
 INT_SIO1	.EQU	8	; ZILOG SIO 1, CHANNEL A & B
 INT_PIO0A	.EQU	9	; ZILOG PIO 0, CHANNEL A
diff --git a/Source/HBIOS/uart.asm b/Source/HBIOS/uart.asm
index 0ab408ae..8b7acec0 100644
--- a/Source/HBIOS/uart.asm
+++ b/Source/HBIOS/uart.asm
@@ -58,6 +58,18 @@ UARTCBASE		.EQU	$80
 UARTMBASE		.EQU	$48
 UART4BASE		.EQU	$C0
 UARTRBASE		.EQU	$A0
+;
+#IF (UARTINTS)
+;
+  #IF ((INTMODE == 2) | (INTMODE == 3))
+;
+UART0_IVT	.EQU	IVT(INT_UART0)
+UART1_IVT	.EQU	IVT(INT_UART1)
+;
+  #ENDIF
+;
+#ENDIF
+
 ;
 #DEFINE	UART_INP(RID)	CALL UART_INP_IMP \ .DB RID
 #DEFINE	UART_OUTP(RID)	CALL UART_OUTP_IMP \ .DB RID
@@ -121,7 +133,17 @@ UART_PREINIT2:
   #ENDIF
 ;
   #IF ((INTMODE == 2) | (INTMODE == 3))
-	; *** FIXME *** IMPLEMENT THIS!!!
+	; SETUP IM2/3 VECTORS
+    #IF (UARTSBC)
+	LD	HL,UART_INTSBC
+	LD	(UART0_IVT),HL		; IVT INDEX
+    #ENDIF
+;
+    #IF (UARTCAS)
+	LD	HL,UART_INTCAS
+	LD	(UART1_IVT),HL		; IVT INDEX
+    #ENDIF
+;
   #ENDIF
 ;
 #ENDIF
@@ -192,22 +214,46 @@ UART_INIT1:
 ; POLLING CHAIN WHEN DEVICES ARE INITIALIZED SUCH THAT
 ; ONLY DEVICES ACTUALLY USING INTS ARE POLLED HERE.
 ;
+  #IF (INTMODE == 1)
+
 UART_INT:
 ;
-#IF (UARTSBC)
+    #IF (UARTSBC)
 	LD	IY,UART_CFG_SBC
 	CALL	UART_INTRCV
 	RET	NZ
-#ENDIF
+    #ENDIF
 ;
-#IF (UARTCAS)
+    #IF (UARTCAS)
 	LD	IY,UART_CFG_CAS
 	CALL	UART_INTRCV
 	RET	NZ
-#ENDIF
+    #ENDIF
+;
+  #ENDIF
+;
+  #IF ((INTMODE == 2) | (INTMODE == 3))
+;
+    #IF (UARTSBC)
+UART_INTSBC:
+	LD	IY,UART_CFG_SBC
+	JR	UART_INTRCV
+    #ENDIF
+;
+    #IF (UARTCAS)
+UART_INTCAS:
+	LD	IY,UART_CFG_CAS
+	JR	UART_INTRCV
+    #ENDIF
+;
+  #ENDIF
 ;
 	XOR	A			; CLEAR ACCUM (INT NOT HANDLED)
 	RET				; DONE
+;
+; IM2 ENTRY POINTS
+;
+
 ;
 ; HANDLE INT FOR A SPECIFIC CHANNEL
 ; BASED ON UNIT CFG POINTED TO BY IY
@@ -648,12 +694,7 @@ UART_DETECT:
 	RET	Z			; DONE IF NO CHIP
 	LD	C,A			; PUT CHIP VARIANT IN C
 ;
-; *** FIXME *** THIS NEEDS TO CHANGE WHEN INTMODE 2/3 IS IMPLEMENTED.  AT THIS
-; POINT, WE ONLY SET THE INT RCV FEATURE BIT FOR IM1 BECAUSE THAT IS ALL
-; THAT IS IMPLEMENTED.
-;
-;#IF ((UARTINTS) & (INTMODE > 0))
-#IF ((UARTINTS) & (INTMODE == 1))
+#IF ((UARTINTS) & (INTMODE > 0))
 ;
 	; CHECK TO SEE IF INT RCV WANTED ON THIS DEVICE
 	PUSH	AF			; SAVE CHIP ID
diff --git a/Source/ver.inc b/Source/ver.inc
index 626cb034..8874a42f 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.115"
+#DEFINE BIOSVER	"3.1.1-pre.116"
diff --git a/Source/ver.lib b/Source/ver.lib
index f9dd93a4..dca1306a 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.115"
+	db	"3.1.1-pre.116"
 	endm