Adjusted constructors.

The constructors are _NOT_ allowed anymore to access the BSS. Rather they must use the DATA segment or the INIT segment. The latter isn't cleared at any point so the constructors may use it to expose values to the main program. However they must make sure to always write the values as they are not pre-initialized.

libsrc/apple2/dosdetect.s

@@ -43,6 +43,6 @@ initdostype:
 :       sta     __dos_type
 done:   rts
 
-        .bss
+        .data
 
-__dos_type:     .res    1
+__dos_type:     .byte   $00

libsrc/apple2/extra/iobuf-0800.s

@@ -90,6 +90,6 @@ iobuf_free:
 
 ; ------------------------------------------------------------------------
 
-        .bss
+        .data
 
 table:  .res    MAX_FDS

libsrc/apple2/get_ostype.s

@@ -65,6 +65,6 @@ _get_ostype:
         ldx     #$00
         rts
 
-        .bss
+        .segment        "INIT"
 
 ostype: .res    1

libsrc/apple2/mainargs.s

@@ -83,6 +83,7 @@ initmainargs:
 ; destroyed.
 
         ldy     #$00
+        sty     buffer + BUF_LEN - 1
 :       lda     BASIC_BUF,x
         sta     buffer,y
         inx
@@ -166,14 +167,13 @@ done:   lda     #<argv
         stx     __argv+1
         rts
 
-; This array is zeroed before initmainargs is called.
-; char* argv[MAXARGS+1] = {FNAM};
-
         .data
 
+; char* argv[MAXARGS+1] = {FNAM};
+
 argv:   .addr   FNAM
         .res    MAXARGS * 2
 
-        .bss
+        .segment        "INIT"
 
 buffer: .res    BUF_LEN