Complete redesign of the CBM610 support.

Use wrappers to call the kernal in bank 15 instead of implementing kernal
functionality within the cc65 libs (eats performance but is much smaller and
simpler).
Improved startup/shutdown code allows a return to the system bank without
calling the BASIC cold start vector.


git-svn-id: svn://svn.cc65.org/cc65/trunk@2793 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/cbm610/banking.s

@@ -5,16 +5,16 @@
 ;
 
  	.export		set_bank, sys_bank, restore_bank
-	.importzp     	ptr1
+	.importzp      	ptr1, segsave
 
-	.include      	"cbm610.inc"
+	.include       	"cbm610.inc"
 
 .code
 
 .proc	sys_bank
 	pha
 	lda  	IndReg
-	sta  	IndSegSave
+	sta  	segsave
 	lda  	#$0F
 	sta  	IndReg
 	pla
@@ -24,7 +24,7 @@
 .proc	set_bank
 	pha
 	lda  	IndReg
-	sta  	IndSegSave
+	sta  	segsave
 	pla
 	sta  	IndReg
 	rts
@@ -32,7 +32,7 @@
 
 .proc	restore_bank
 	pha
-	lda	IndSegSave
+	lda	segsave
 	sta	IndReg
 	pla
 	rts