add msbasic

msbasic/defines_w65c816sxb.s

@@ -0,0 +1,26 @@
+; configuration
+CONFIG_2C := 1
+
+CONFIG_NO_CR        := 1
+CONFIG_SCRTCH_ORDER := 2
+
+; zero page
+ZP_START1 := $00
+ZP_START2 := $0D
+ZP_START3 := $5B
+ZP_START4 := $65
+
+;extra ZP variables
+USR              := $000A
+
+; constants
+STACK_TOP        := $FC
+SPACE_FOR_GOSUB  := $33
+WIDTH            := 72
+WIDTH2           := 56
+
+; memory layout
+RAMSTART2        := $5000
+SAVE:
+LOAD:
+        rts