* Moved the BASIC stub that calls the compiled program into it's own segment

named EXEHDR.
* Renamed BASICHDR to EXEHDR for the PET-II machines.
* Moved the call to CHRCH in front of the code that saves the zero page, since
  open files are sometimes remembered in the zero page, so we need to close
  them before we grab a copy.


git-svn-id: svn://svn.cc65.org/cc65/trunk@4507 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/plus4/crt0.s

@@ -20,10 +20,9 @@
 IRQInd 	       	= $500	; JMP $0000 - used as indirect IRQ vector
 
 ; ------------------------------------------------------------------------
-; Place the startup code in a special segment to cope with the quirks of
-; plus/4 banking.
+; BASIC header with a SYS call
 
-.segment       	"STARTUP"
+.segment       	"EXEHDR"
 
         .word   Head            ; Load address
 Head:   .word   @Next
@@ -37,22 +36,28 @@ Head:   .word   @Next
 @Next:  .word   0               ; BASIC end marker
 
 ; ------------------------------------------------------------------------
-; Actual code
+; Startup code
 
-Start:  sei                     ; No interrupts since we're banking out the ROM
-        sta     ENABLE_RAM
-       	ldx   	#zpspace-1
-L1:	lda	sp,x
-   	sta	zpsave,x	; save the zero page locations we need
-  	dex
-       	bpl	L1
-        sta     ENABLE_ROM
-        cli
+.segment       	"STARTUP"
+
+Start:
 
 ; Close open files
 
   	jsr	$FFCC           ; CLRCH
 
+; Save the zero page locations we need
+
+        sei                     ; No interrupts since we're banking out the ROM
+        sta     ENABLE_RAM
+       	ldx   	#zpspace-1
+L1:	lda	sp,x
+   	sta	zpsave,x
+  	dex
+       	bpl	L1
+        sta     ENABLE_ROM
+        cli
+
 ; Switch to second charset
 
   	lda	#14