diff --git a/src/apple2.h b/src/apple2.h
index dea2e52b..94973759 100644
--- a/src/apple2.h
+++ b/src/apple2.h
@@ -17,7 +17,9 @@
 #ifndef _A2_H_
 #define _A2_H_
 
+#ifdef HAVE_CONFIG_H
 #include "config.h"
+#endif
 
 #define BANK2           0x10000
 
diff --git a/src/asm386/memory.S b/src/asm386/memory.S
index ce80b3de..6bb7edc3 100644
--- a/src/asm386/memory.S
+++ b/src/asm386/memory.S
@@ -179,9 +179,11 @@ E(read_random)
 		ret
 
 E(read_speaker_toggle_pc)
+#ifdef AUDIO_ENABLED
                 pushal
 		call	SN(SpkrToggle)
                 popal // FIXME, do we need to set %al to something here?
+#endif
 		ret
 
 E(read_switch_primary_page)
diff --git a/src/disk.c b/src/disk.c
index a3aad85a..6dc882d1 100644
--- a/src/disk.c
+++ b/src/disk.c
@@ -106,9 +106,14 @@ void c_eject_6(int drive) {
         const char* const err = def(disk6.disk[drive].file_name);
         if (err)
         {
+            ERRLOG("OOPS: An error occurred when attempting to compress a disk image : %s", err);
+#ifdef INTERFACE_CLASSIC
             snprintf(&zlibmenu[4][2], 37, "%s", err);
             c_interface_print_submenu_centered(zlibmenu[0], ZLIB_SUBMENU_W, ZLIB_SUBMENU_H);
-            while ((ch = c_mygetch(1)) == -1) { }
+            while ((ch = c_mygetch(1)) == -1) {
+                // ...
+            }
+#endif
         }
         else
         {
@@ -158,14 +163,12 @@ int c_new_diskette_6(int drive, char *file_name, int cmpr, int nib, int force) {
 
         if (!force)
         {
-            /* Open read only */
             disk6.disk[drive].fp = fopen(disk6.disk[drive].file_name, "r+");
             disk6.disk[drive].is_protected = 0;
         }
 
         if ((disk6.disk[drive].fp == NULL) || (force))
         {
-            /* Open for read AND write */
             disk6.disk[drive].fp = fopen(disk6.disk[drive].file_name, "r");
             disk6.disk[drive].is_protected = 1;    /* disk is write protected! */
         }
diff --git a/src/joystick.c b/src/joystick.c
index 2259d60d..88151cea 100644
--- a/src/joystick.c
+++ b/src/joystick.c
@@ -121,6 +121,7 @@ static void c_calculate_pc_joystick_parms()
     js_adjusthigh_y = (float)HALF_JOY_RANGE / (float)js_upperrange_y;
 }
 
+#ifdef INTERFACE_CLASSIC
 /* -------------------------------------------------------------------------
     c_calibrate_pc_joystick() - calibrates joystick.  determines extreme
     and center coordinates.  assumes that it can write to the interface
@@ -143,10 +144,6 @@ static void c_calibrate_pc_joystick()
       "| Is the proper kernel module loaded?  |",
       "|                                      |",
       "||||||||||||||||||||||||||||||||||||||||" };
-#define JOYERR_SHOWERR(ERR) \
-    copy_and_pad_string(&errmenu[3][2], ERR, ' ', JOYERR_PAD, ' '); \
-    c_interface_print_submenu_centered(errmenu[0], JOYERR_SUBMENU_W, JOYERR_SUBMENU_H); \
-    while (c_mygetch(1) == -1) { }
 
     /* reset all the extremes */
     js_max_x = INT_MIN;
@@ -159,7 +156,15 @@ static void c_calibrate_pc_joystick()
     {
         if (c_open_pc_joystick())
         {
-            JOYERR_SHOWERR(strerror(errno));
+            const char *err = strerror(errno);
+            ERRLOG("OOPS, cannot open pc joystick : %s", err);
+#ifdef INTERFACE_CLASSIC
+            copy_and_pad_string(&errmenu[3][2], err, ' ', JOYERR_PAD, ' ');
+            c_interface_print_submenu_centered(errmenu[0], JOYERR_SUBMENU_W, JOYERR_SUBMENU_H);
+            while (c_mygetch(1) == -1) {
+                // ...
+            }
+#endif
             return;
         }
     }
@@ -317,9 +322,10 @@ static void c_calibrate_pc_joystick()
         nanosleep(&ts, NULL);
     }
 }
+#endif // INTERFACE_CLASSIC
 #endif // LINUX_JOYSTICK
 
-#ifdef KEYPAD_JOYSTICK
+#if defined(KEYPAD_JOYSTICK) && defined(INTERFACE_CLASSIC)
 static void c_calibrate_keypad_joystick()
 {
 
@@ -426,7 +432,7 @@ static void c_calibrate_keypad_joystick()
         nanosleep(&ts, NULL);
     }
 }
-#endif // KEYPAD_JOYSTICK
+#endif // KEYPAD_JOYSTICK && INTERFACE_CLASSIC
 
 #ifdef TOUCH_JOYSTICK
 // TBD ...
@@ -465,6 +471,7 @@ void c_close_joystick()
 #endif
 }
 
+#ifdef INTERFACE_CLASSIC
 void c_calibrate_joystick()
 {
 #ifdef LINUX_JOYSTICK
@@ -481,6 +488,7 @@ void c_calibrate_joystick()
     }
 #endif
 }
+#endif // INTERFACE_CLASSIC
 
 void c_joystick_reset()
 {
diff --git a/src/keys.c b/src/keys.c
index 59f6c26c..21828e1b 100644
--- a/src/keys.c
+++ b/src/keys.c
@@ -241,11 +241,14 @@ void c_handle_input(int scancode, int pressed)
             }
 
             pthread_mutex_lock(&interface_mutex);
+#ifdef AUDIO_ENABLED
             SoundSystemPause();
+#endif
             in_interface = true;
 
             switch (current_key)
             {
+#ifdef INTERFACE_CLASSIC
             case kF1:
                 c_interface_select_diskette( 0 );
                 break;
@@ -253,6 +256,7 @@ void c_handle_input(int scancode, int pressed)
             case kF2:
                 c_interface_select_diskette( 1 );
                 break;
+#endif
 
             case kPAUSE:
                 while (c_mygetch(1) == -1)
@@ -262,6 +266,7 @@ void c_handle_input(int scancode, int pressed)
                 }
                 break;
 
+#ifdef INTERFACE_CLASSIC
             case kF5:
                 c_interface_keyboard_layout();
                 break;
@@ -279,12 +284,15 @@ void c_handle_input(int scancode, int pressed)
             case kF10:
                 c_interface_parameters();
                 break;
+#endif
 
             default:
                 break;
             }
 
+#ifdef AUDIO_ENABLED
             SoundSystemUnpause();
+#endif
             c_joystick_reset();
             pthread_mutex_unlock(&interface_mutex);
             in_interface = false;
diff --git a/src/meta/debugger.c b/src/meta/debugger.c
index 1e85b323..ee333956 100644
--- a/src/meta/debugger.c
+++ b/src/meta/debugger.c
@@ -1284,6 +1284,7 @@ void do_debug_command() {
         main debugging console
    ------------------------------------------------------------------------- */
 
+#ifdef INTERFACE_CLASSIC
 void c_interface_debugging() {
 
     static char lex_initted = 0;
@@ -1371,4 +1372,5 @@ void c_interface_debugging() {
     }
     return;
 }
+#endif
 
diff --git a/src/misc.c b/src/misc.c
index f03a8cf0..71805676 100644
--- a/src/misc.c
+++ b/src/misc.c
@@ -744,8 +744,10 @@ void reinitialize(void)
 
 void c_initialize_firsttime()
 {
+#ifdef INTERFACE_CLASSIC
     /* read in system files and calculate system defaults */
     c_load_interface_font();
+#endif
 
     /* initialize the video system */
     video_init();
diff --git a/src/prefs.c b/src/prefs.c
index c4f16228..dc136325 100644
--- a/src/prefs.c
+++ b/src/prefs.c
@@ -209,11 +209,11 @@ void load_settings(void)
         config_file = fopen(config_filename, "r");
         if (config_file == NULL)
         {
-            printf(
+            ERRLOG(
                 "Warning. Cannot open the .apple2 system defaults file.\n"
                 "Make sure it's readable in your home directory.");
-            printf("Press RETURN to continue...");
-            getchar();
+            ERRLOG("Press RETURN to continue...");
+            getchar(); // HACK FIXME -- this needs to be decoupled from both testing and mobile targets
             return;
         }
 
@@ -236,7 +236,7 @@ void load_settings(void)
             switch (main_match)
             {
             case PRM_NONE:
-                fprintf(stderr, "Unrecognized config parameter `%s'", parameter);
+                ERRLOG("Unrecognized config parameter `%s'", parameter);
                 break;
 
             case PRM_SPEED:
@@ -352,6 +352,11 @@ bool save_settings(void)
 
     LOG("Saving preferences...");
 
+#define PREFS_ERRPRINT() \
+        ERRLOG( \
+            "Cannot open the .apple2/apple2.cfg system defaults file for writing.\n" \
+            "Make sure it has rw permission in your home directory.")
+
 #define ERROR_SUBMENU_H 9
 #define ERROR_SUBMENU_W 40
     int ch = -1;
@@ -370,14 +375,13 @@ bool save_settings(void)
     config_file = fopen(config_filename, "w");
     if (config_file == NULL)
     {
-        printf(
-            "Cannot open the .apple2/apple2.cfg system defaults file for writing.\n"
-            "Make sure it has rw permission in your home directory.");
+        PREFS_ERRPRINT();
+#ifdef INTERFACE_CLASSIC
         c_interface_print_submenu_centered(submenu[0], ERROR_SUBMENU_W, ERROR_SUBMENU_H);
         while ((ch = c_mygetch(1)) == -1)
         {
         }
-
+#endif
         return false;
     }
 
@@ -417,10 +421,13 @@ bool save_settings(void)
 
     if (anErr)
     {
+        PREFS_ERRPRINT();
+#ifdef INTERFACE_CLASSIC
         c_interface_print_submenu_centered(submenu[0], ERROR_SUBMENU_W, ERROR_SUBMENU_H);
         while ((ch = c_mygetch(1)) == -1)
         {
         }
+#endif
         return false;
     }
 
diff --git a/src/timing.c b/src/timing.c
index 93b2fa86..ba1db4d6 100644
--- a/src/timing.c
+++ b/src/timing.c
@@ -95,10 +95,12 @@ static void _timing_initialize(double scale)
 
     g_fCurrentCLK6502 = CLK_6502 * scale;
     // this is extracted out of SetClksPerSpkrSample -- speaker.c
+#ifdef AUDIO_ENABLED
     g_fClksPerSpkrSample = (double) (UINT) (g_fCurrentCLK6502 / (double)SPKR_SAMPLE_RATE);
     SpkrReinitialize();
 
     LOG("timing_initialize() ... ClockRate:%0.2lf  ClockCyclesPerSpeakerSample:%0.2lf", g_fCurrentCLK6502, g_fClksPerSpkrSample);
+#endif
 }
 
 static void _switch_to_fullspeed(double scale)