Use $D000 for I/O

Author: willisblackburn

vc83_serial/vc83_serial.inc

@@ -2,7 +2,7 @@
 ;
 ; SPDX-License-Identifier: MIT
 
-UART_BASE       := $C100
+UART_BASE       := $D100
 UART_TX_LEVEL   := UART_BASE + 0
 UART_RX_LEVEL   := UART_BASE + 1
 UART_TX_DATA    := UART_BASE + 2

vc83_serial/vc83_serial_startup.s

@@ -10,13 +10,6 @@ startup:
         cld                             ; Clear decimal flag
         ldx     #$FF        
         txs                             ; Initialize the stack to $FF
-
-        ; Map $Cxxx to $30xxx
-        ; The system uses ZP $02 to map $Cxxx to 20-bit addresses.
-        ; $30100 is in the range mapped by $30.
-        lda     #$30
-        sta     $02
-
         jsr     initialize_target
         jsr     main        
 @halt: