# "main program" load chunk
     MAINHDR:       file = %O,               start = $0000,                  size = $0004;
     RAM:           file = %O, define = yes, start = %S +
-                                                    __LOWDATA_SIZE__,       size = $D000 -
+                                                    __LOWBSS_SIZE__,        size = $D000 -
                                                                                    __STACKSIZE__ -
                                                                                    %S -
-                                                                                   __LOWDATA_SIZE__;
+                                                                                   __LOWBSS_SIZE__;
 
 # defines entry point into program
     TRAILER:       file = %O,               start = $0000, size = $0006;
     SYSCHKTRL:   load = SYSCHKTRL,                    type = ro,                optional = yes;
 
     SRPREPHDR:   load = SRPREPHDR,                    type = ro;
-    LOWDATA:     load = SRPREPCHNK,                   type = bss, define = yes;  # shared btw. SRPREP and RAM
+    LOWBSS:      load = SRPREPCHNK,                   type = bss, define = yes;  # shared btw. SRPREPCHNK and RAM, not zero initialized
     SRPREP:      load = SRPREPCHNK,                   type = rw,  define = yes;
     SHADOW_RAM:  load = SRPREPCHNK, run = HIDDEN_RAM, type = rw,  define = yes, optional = yes;
     SHADOW_RAM2: load = SRPREPCHNK, run = HIDDEN_RAM, type = rw,  define = yes, optional = yes;
 
     MAINHDR:       file = %O,               start = $0000,                  size = $0004;
     RAM:           file = %O, define = yes, start = %S +
                                                     __OVERLAYSIZE__ +
-                                                    __LOWDATA_SIZE__,       size = $D000 -
+                                                    __LOWBSS_SIZE__,        size = $D000 -
                                                                                    __STACKSIZE__ -
                                                                                    %S -
                                                                                    __OVERLAYSIZE__ -
-                                                                                   __LOWDATA_SIZE__;
+                                                                                   __LOWBSS_SIZE__;
 
 # defines entry point into program
     TRAILER:       file = %O,               start = $0000, size = $0006;
     SYSCHKTRL:   load = SYSCHKTRL,                     type = ro,                optional = yes;
 
     SRPREPHDR:   load = SRPREPHDR,                     type = ro;
-    LOWDATA:     load = SRPREPCHNK,                    type = bss, define = yes;  # shared btw. SRPREP and RAM
+    LOWBSS:      load = SRPREPCHNK,                    type = bss, define = yes;  # shared btw. SRPREPCHNK and RAM, not zero initialized
     SRPREP:      load = SRPREPCHNK,                    type = rw,  define = yes;
     SHADOW_RAM:  load = SRPREPCHNK, run = HIDDEN_RAM,  type = rw,  define = yes, optional = yes;
     SHADOW_RAM2: load = SRPREPCHNK, run = HIDDEN_RAM2, type = rw,  define = yes, optional = yes;
 
 # "main program" load chunk
     MAINHDR:       file = %O,               start = $0000,                  size = $0004;
     RAM:           file = %O, define = yes, start = %S +
-                                                    __LOWDATA_SIZE__,       size = $D000 -
+                                                    __LOWBSS_SIZE__,        size = $D000 -
                                                                                    __STACKSIZE__ -
                                                                                    %S -
-                                                                                   __LOWDATA_SIZE__;
+                                                                                   __LOWBSS_SIZE__;
 
 # defines entry point into program
     TRAILER:       file = %O,               start = $0000, size = $0006;
     SYSCHKTRL:   load = SYSCHKTRL,                     type = ro,                optional = yes;
 
     SRPREPHDR:   load = SRPREPHDR,                     type = ro;
-    LOWDATA:     load = SRPREPCHNK,                    type = bss, define = yes;  # shared btw. SRPREP and RAM
+    LOWBSS:      load = SRPREPCHNK,                    type = bss, define = yes;  # shared btw. SRPREPCHNK and RAM, not zero initialized
     SRPREP:      load = SRPREPCHNK,                    type = rw,  define = yes;
     SHADOW_RAM:  load = SRPREPCHNK, run = HIDDEN_RAM,  type = rw,  define = yes, optional = yes;
     SHADOW_RAM2: load = SRPREPCHNK, run = HIDDEN_RAM2, type = rw,  define = yes, optional = yes;
 
 .export         RAMTOP_save
 .export         PORTB_save
 
-.segment        "LOWDATA"
+.segment        "LOWBSS"
 
 SAVMSC_save:    .res    2
 MEMTOP_save:    .res    2
 
 zpptr1: .res    2
 
 
-.segment "LOWDATA"
+.segment "LOWBSS"
 
 ; bounce buffers for CIO and SIO calls
 bounce_buffer:  .res    BUFSZ_SIO