diff --git a/cfg/atari7800.cfg b/cfg/atari7800.cfg
index cf663be3d..8029ca674 100644
--- a/cfg/atari7800.cfg
+++ b/cfg/atari7800.cfg
@@ -2,6 +2,16 @@
 
 SYMBOLS {
     __STACKSIZE__:        type = weak, value = $0010; # 16 bytes stack
+    __EXEHDR__:           type = import;
+    __VEC_BOTTOM__:       value = $fffa, type = export;
+    __VEC_SIZE__:         value = $6, type = export;
+    __ENCRYPT_BOTTOM__:   value = $ff7a, type = export;
+    __ENCRYPT_SIZE__:     value = $80, type = export;
+    __MEMORY_TOP__:       value = __ENCRYPT_BOTTOM__, type = export;
+    __INIT_SIZE__:        value = 69, type = export;
+    __MEMORY_INIT__:      value = __MEMORY_TOP__ - __INIT_SIZE__, type = export;
+    __MEMORY_BOTTOM__:    value = $8000, type = export;
+    __FREE_ROM_SIZE__:    value = __MEMORY_INIT__ - __MEMORY_BOTTOM__, type = export;
 }
 
 MEMORY {
@@ -10,27 +20,31 @@ MEMORY {
     RAM1:   file = "", define = yes, start = $1800, size = $0840, type = rw;
     RAM2:   file = "", define = yes, start = $2100, size = $0040, type = rw;
     RAM3:   file = "", define = yes, start = $2200, size = $0600, type = rw;
+    # For emulators you also need a header file
+    HEADER: file = %O,               start = $0000, size = 128;
     # "Normal" cartridge rom. Multiple banks arent supported
     # by this script. You may change the rom size, but keep
     # two things in mind:
     # - start must be a multiple of $1000
     # - ROM must end at $ff79
-    ROM:    file = %O, define = yes, start = $8000, size = $7f7a, type = ro, fill = yes, fillval = $ff;
+    ROM:    file = %O, define = yes, start = __MEMORY_BOTTOM__, size = __FREE_ROM_SIZE__, type = ro, fill = yes, fillval = $ff;
+    ROMS:   file = %O, define = yes, start = __MEMORY_INIT__, size = __INIT_SIZE__, type = ro, fill = yes, fillval = $ff;
     # Encryption stuff
-    ROME:   file = %O, start = $ff7a, size = $80, type = ro, fill = yes, fillval = $ff;
+    ROME:   file = %O, start = __ENCRYPT_BOTTOM__, size = __ENCRYPT_SIZE__, type = ro, fill = yes, fillval = $ff;
     # Interrupt vectors
-    ROMV:   file = %O, start = $fffa, size = $6, type = ro, fill = yes, fillval = $ff;
+    ROMV:   file = %O, start = __VEC_BOTTOM__, size = __VEC_SIZE__, type = ro, fill = yes, fillval = $ff;
 }
 
 SEGMENTS {
     ZEROPAGE:   load = ZP,              type = zp;
-    STARTUP:    load = ROM,             type = ro,  define = yes;
-    ONCE:       load = ROM,             type = ro,  define = yes;
+    EXEHDR:     load = HEADER,          type = ro,  define = yes;
+    STARTUP:    load = ROMS,             type = ro,  define = yes;
+    ONCE:       load = ROMS,             type = ro,  define = yes;
     CODE:       load = ROM,             type = ro,  define = yes;
     RODATA:     load = ROM,             type = ro,  define = yes, align = 256;
     DATA:       load = ROM, run = RAM1, type = rw,  define = yes;
     BSS:        load = RAM1,            type = bss, define = yes;
-    VECTORS:    load = ROM,             type = ro,  define = yes;
+    VECTORS:    load = ROMV,            type = ro,  define = yes;
     ENCRYPTION: load = ROME,            type = ro   define = yes;
 }
 
diff --git a/libsrc/atari7800/exehdr.s b/libsrc/atari7800/exehdr.s
index 15ce7ea29..6f3023040 100644
--- a/libsrc/atari7800/exehdr.s
+++ b/libsrc/atari7800/exehdr.s
@@ -1,3 +1,10 @@
+;
+; Karri Kaksonen, 2022
+;
+; This header contains data for emulators
+;
+        .export         __EXEHDR__: absolute = 1
+
 ; ------------------------------------------------------------------------
 ; EXE header
 	.segment "EXEHDR"