diff --git a/asminc/atmos.inc b/asminc/atmos.inc
index 20bb806f1..6534a2ef0 100644
--- a/asminc/atmos.inc
+++ b/asminc/atmos.inc
@@ -18,21 +18,26 @@ FNAME_LEN       = 16            ; maximum length of file-name
 ; ---------------------------------------------------------------------------
 ; Zero page
 
+SCRPTR          := $12
 BASIC_BUF       := $35
+CHARGOT         := $E8
+TXTPTR          := $E9
 
 
 ; ---------------------------------------------------------------------------
 ; Low memory
 
 MODEKEY         := $0209
-CAPSLOCK        := $020C
+CAPSLOCK        := $020C        ; $7F = not locked, $FF = locked
 PATTERN         := $0213
-IRQVec          := $0245
+IRQVec          := $0245        ; "fast" interrupt vector
 JOINFLAG        := $025A        ; 0 = don't joiu, $4A = join BASIC programs
 VERIFYFLAG      := $025B        ; 0 = load, 1 = verify
 CURS_Y          := $0268
 CURS_X          := $0269
 STATUS          := $026A
+BACKGRND        := $026B
+FOREGRND        := $026C
 TIMER3          := $0276
 CFILE_NAME      := $027F
 CFOUND_NAME     := $0293
@@ -40,10 +45,13 @@ FILESTART       := $02A9
 FILEEND         := $02AB
 AUTORUN         := $02AD        ; $00 = only load, $C7 = autorun
 LANGFLAG        := $02AE        ; $00 = BASIC, $80 = machine code
+LOADERR         := $02B1
 KEYBUF          := $02DF
+PARMERR         := $02E0
 PARAM1          := $02E1        ; & $02E2
 PARAM2          := $02E3        ; & $02E4
 PARAM3          := $02E5        ; & $02E6
+BANGVEC         := $02F5
 
 
 ; ---------------------------------------------------------------------------
@@ -92,3 +100,11 @@ POINT           := $F1C8
 PAPER           := $F204
 INK             := $F210
 PRINT           := $F77C
+
+; Sound Effects
+PING            := $FA9F
+SHOOT           := $FAB5
+EXPLODE         := $FACB
+ZAP             := $FAE1
+TICK            := $FB14
+TOCK            := $FB2A
diff --git a/include/atmos.h b/include/atmos.h
index eed6d7564..72388c974 100644
--- a/include/atmos.h
+++ b/include/atmos.h
@@ -126,12 +126,36 @@ extern void atmos_240_200_2_tgi[];      /* Referred to by tgi_static_stddrv[] */
 
 
 
+/*****************************************************************************/
+/*                                 Functions                                 */
+/*****************************************************************************/
+
+
+
 void __fastcall__ atmos_load(const char* name);
 /* Load Atmos tape. */
 
 void __fastcall__ atmos_save(const char* name, const void* start, const void* end);
 /* Save Atmos tape. */
 
+void atmos_explode (void);
+/* Bomb sound effect */
+
+void atmos_ping (void);
+/* Bell or ricochet sound effect */
+
+void atmos_shoot (void);
+/* Pistol sound effect */
+
+void atmos_tick (void);
+/* High-pitch click */
+
+void atmos_tock (void);
+/* Low-pitch click */
+
+void atmos_zap (void);
+/* Raygun sound effect */
+
 
 
 /* End of atmos.h */
diff --git a/libsrc/atmos/atmos.s b/libsrc/atmos/atmos.s
new file mode 100644
index 000000000..6b5a4a49c
--- /dev/null
+++ b/libsrc/atmos/atmos.s
@@ -0,0 +1,15 @@
+;
+; Expose include-file symbol names to C code.
+;
+
+        .export         _atmos_ping, _atmos_shoot, _atmos_explode
+        .export         _atmos_zap, _atmos_tick, _atmos_tock
+
+        .include        "atmos.inc"
+
+_atmos_ping     := PING
+_atmos_shoot    := SHOOT
+_atmos_explode  := EXPLODE
+_atmos_zap      := ZAP
+_atmos_tick     := TICK
+_atmos_tock     := TOCK