demos should check their own hardware requirements now

src/demo/choplifter.a

@@ -8,6 +8,7 @@
          !source "src/constants.a"   ; no code in these
          !source "src/macros.a"
 
+         +GAME_REQUIRES_JOYSTICK
          +READ_RAM2_WRITE_RAM2
          jsr   EnableAccelerator
          +LOAD_FILE_AT choplifter, $00

src/demo/gamma.goblins.a

@@ -8,6 +8,7 @@
          !source "src/constants.a"   ; no code in these
          !source "src/macros.a"
 
+         +GAME_REQUIRES_JOYSTICK
          +READ_RAM2_WRITE_RAM2
          jsr   EnableAccelerator
          +LOAD_FILE_AT title, $00

src/demo/pitfall.ii.a

@@ -8,6 +8,7 @@
          !source "src/constants.a"   ; no code in these
          !source "src/macros.a"
 
+         +GAME_REQUIRES_JOYSTICK
          +READ_RAM2_WRITE_RAM2
          jsr   EnableAccelerator
          +LOAD_FILE_AT title, $00

src/demo/space.eggs.a

@@ -8,6 +8,7 @@
          !source "src/constants.a"   ; no code in these
          !source "src/macros.a"
 
+         +GAME_REQUIRES_JOYSTICK
          +READ_RAM2_WRITE_RAM2
          jsr   EnableAccelerator
          +LOAD_FILE_AT title, $00

src/demo/stargate.a

@@ -8,6 +8,7 @@
          !source "src/constants.a"   ; no code in these
          !source "src/macros.a"
 
+         +GAME_REQUIRES_JOYSTICK
          +READ_RAM2_WRITE_RAM2
          jsr   EnableAccelerator
          +LOAD_FILE_AT title, $00

src/demo/tubeway.a

@@ -8,6 +8,7 @@
          !source "src/constants.a"   ; no code in these
          !source "src/macros.a"
 
+         +GAME_REQUIRES_JOYSTICK
          +READ_RAM2_WRITE_RAM2
          jsr   EnableAccelerator
          +LOAD_FILE_AT tubeway, $00

src/macros.a

@@ -330,6 +330,7 @@
          lda   MachineStatus
          +READ_ROM_NO_WRITE
 }
+
 !macro   USES_TEXT_PAGE_2 {
          lda   ROM_MACHINEID
          cmp   #$06
@@ -439,5 +440,15 @@
          sta   iCurBlockLo
 }
 
+; Macros for demo launchers that need to check whether they should run
+; on the current machine. These will RTS if the requirements are not met.
+!macro   GAME_REQUIRES_JOYSTICK {
+         +GET_MACHINE_STATUS
+         and   #HAS_JOYSTICK
+         bne   +
+         rts
++
+}
+
 _MACROS_=*
 }