NABU Stuff

- Implement Interrupt Mode 2 (Mode 1 is still default)
- Implement interrupt driven keyboard support
- Improve UART keyboard driver to support interrupt driven flow control

Source/HBIOS/uart.asm

@@ -57,7 +57,14 @@ UART_CTSBAD		.EQU	4	; CTS STALL DETECTED
 #IF (PLATFORM == PLT_DUO)
 UARTSBASE		.EQU	$58
 UARTDBASE		.EQU	$70
-#ELSE
+#ENDIF
+;
+#IF (PLATFORM == PLT_NABU)
+UARTSBASE		.EQU	$48
+UARTDBASE		.EQU	$80
+#ENDIF
+;
+#IF ((PLATFORM != PLT_DUO) & (PLATFORM != PLT_NABU))
 UARTSBASE		.EQU	$68
 UARTDBASE		.EQU	$80
 #ENDIF
@@ -67,7 +74,6 @@ UARTCBASE		.EQU	$80
 UARTMBASE		.EQU	$18
 UART4BASE		.EQU	$C0
 UARTRBASE		.EQU	$A0
-UARTNBASE		.EQU	$48
 ;
 #IF (UARTINTS)
 ;
@@ -79,7 +85,6 @@ UART1_IVT	.EQU	IVT(INT_UART1)
   #ENDIF
 ;
 #ENDIF
-
 ;
 #DEFINE	UART_INP(RID)	CALL UART_INP_IMP \ .DB RID
 #DEFINE	UART_OUTP(RID)	CALL UART_OUTP_IMP \ .DB RID
@@ -1185,18 +1190,6 @@ UART_CFG_MFP:
 	DEVECHO	"\n"
 ;
 #ENDIF
-#IF (UARTNABU)
-	.DB	0				; DEVICE NUMBER (UPDATED DURING INIT)
-	.DB	0				; UART TYPE
-	.DB	UARTNBASE			; IO PORT BASE (RBR, THR)
-	.DB	UARTNBASE + UART_LSR		; LINE STATUS PORT (LSR)
-	.DW	UARTCFG				; LINE CONFIGURATION
-	.DW	0				; SHOULD NEVER NEED INT HANDLER
-;
-	DEVECHO	"UART: MODE=NABU, IO="
-	DEVECHO	UARTNBASE
-	DEVECHO	"\n"
-#ENDIF
 ;
 UART_CNT	.EQU	($ - UART_CFG) / 8
 ;