diff --git a/src/devices/machine/rescap.h b/src/devices/machine/rescap.h
index 851a7c25528..d96347bacbc 100644
--- a/src/devices/machine/rescap.h
+++ b/src/devices/machine/rescap.h
@@ -3,7 +3,7 @@
 #ifndef MAME_MACHINE_RESCAP_H
 #define MAME_MACHINE_RESCAP_H
 
-/* Little helpers for magnitude conversions */
+// Little helpers for magnitude conversions
 #define RES_R(res) ((double)(res))
 #define RES_K(res) ((double)(res) * 1e3)
 #define RES_M(res) ((double)(res) * 1e6)
@@ -15,7 +15,7 @@
 #define IND_N(ind) ((double)(ind) * 1e-9)
 #define IND_P(ind) ((double)(ind) * 1e-12)
 
-/*  vin --/\r1/\-- out --/\r2/\-- gnd  */
+//  vin --/\r1/\-- out --/\r2/\-- gnd
 #define RES_VOLTAGE_DIVIDER(r1, r2)     ((double)(r2) / ((double)(r1) + (double)(r2)))
 
 #define RES_2_PARALLEL(r1, r2)          (((r1) * (r2)) / ((r1) + (r2)))
@@ -26,4 +26,15 @@
 
 #define RES_2_SERIAL(r1,r2)             ((r1)+(r2))
 
+// macro for the RC time constant on a 74LS123 with C > 1000pF
+// R is in ohms, C is in farads
+#define TIME_OF_74LS123(r,c)            (0.45 * (double)(r) * (double)(c))
+
+// macros for the RC time constant on a 555 timer IC
+// R is in ohms, C is in farads
+#define PERIOD_OF_555_MONOSTABLE_NSEC(r,c)  ((attoseconds_t)(1100000000 * (double)(r) * (double)(c)))
+#define PERIOD_OF_555_ASTABLE_NSEC(r1,r2,c) ((attoseconds_t)( 693000000 * ((double)(r1) + 2.0 * (double)(r2)) * (double)(c)))
+#define PERIOD_OF_555_MONOSTABLE(r,c)       attotime::from_nsec(PERIOD_OF_555_MONOSTABLE_NSEC(r,c))
+#define PERIOD_OF_555_ASTABLE(r1,r2,c)      attotime::from_nsec(PERIOD_OF_555_ASTABLE_NSEC(r1,r2,c))
+
 #endif // MAME_MACHINE_RESCAP_H
diff --git a/src/emu/schedule.h b/src/emu/schedule.h
index b7658c682ac..67f6d945898 100644
--- a/src/emu/schedule.h
+++ b/src/emu/schedule.h
@@ -24,17 +24,6 @@
 
 #define TIMER_CALLBACK_MEMBER(name)     void name(void *ptr, s32 param)
 
-// macro for the RC time constant on a 74LS123 with C > 1000pF
-// R is in ohms, C is in farads
-#define TIME_OF_74LS123(r,c)            (0.45 * (double)(r) * (double)(c))
-
-// macros for the RC time constant on a 555 timer IC
-// R is in ohms, C is in farads
-#define PERIOD_OF_555_MONOSTABLE_NSEC(r,c)  ((attoseconds_t)(1100000000 * (double)(r) * (double)(c)))
-#define PERIOD_OF_555_ASTABLE_NSEC(r1,r2,c) ((attoseconds_t)( 693000000 * ((double)(r1) + 2.0 * (double)(r2)) * (double)(c)))
-#define PERIOD_OF_555_MONOSTABLE(r,c)       attotime::from_nsec(PERIOD_OF_555_MONOSTABLE_NSEC(r,c))
-#define PERIOD_OF_555_ASTABLE(r1,r2,c)      attotime::from_nsec(PERIOD_OF_555_ASTABLE_NSEC(r1,r2,c))
-
 
 //**************************************************************************
 //  TYPE DEFINITIONS
diff --git a/src/mame/audio/williams.cpp b/src/mame/audio/williams.cpp
index c78684aa3dc..582b7f9bb48 100644
--- a/src/mame/audio/williams.cpp
+++ b/src/mame/audio/williams.cpp
@@ -33,6 +33,7 @@
 #include "emu.h"
 #include "williams.h"
 #include "machine/6821pia.h"
+#include "machine/rescap.h"
 #include "cpu/m6809/m6809.h"
 #include "sound/ym2151.h"
 #include "sound/okim6295.h"
diff --git a/src/mame/drivers/bfm_sc1.cpp b/src/mame/drivers/bfm_sc1.cpp
index b3a0a3d6ba5..6018a8374fd 100644
--- a/src/mame/drivers/bfm_sc1.cpp
+++ b/src/mame/drivers/bfm_sc1.cpp
@@ -101,6 +101,7 @@ Optional (on expansion card) (Viper)
 #include "machine/gen_latch.h"
 #include "machine/watchdog.h"
 #include "machine/bfm_comn.h"
+#include "machine/rescap.h"
 #include "speaker.h"
 
 #include "sc1_vfd.lh"
diff --git a/src/mame/drivers/bfm_sc2.cpp b/src/mame/drivers/bfm_sc2.cpp
index f976ba2cd75..64e6a8ae3fc 100644
--- a/src/mame/drivers/bfm_sc2.cpp
+++ b/src/mame/drivers/bfm_sc2.cpp
@@ -160,6 +160,7 @@ Adder hardware:
 
 #include "machine/bfm_bd1.h"  // vfd
 #include "machine/meters.h"
+#include "machine/rescap.h"
 
 #include "speaker.h"
 
diff --git a/src/mame/drivers/capbowl.cpp b/src/mame/drivers/capbowl.cpp
index 96a31ab31ea..c98bc2a67f5 100644
--- a/src/mame/drivers/capbowl.cpp
+++ b/src/mame/drivers/capbowl.cpp
@@ -90,6 +90,7 @@
 #include "emu.h"
 #include "includes/capbowl.h"
 
+#include "machine/rescap.h"
 #include "machine/ticket.h"
 #include "cpu/m6809/m6809.h"
 #include "sound/2203intf.h"
diff --git a/src/mame/drivers/gottlieb.cpp b/src/mame/drivers/gottlieb.cpp
index 2270b468c7b..cd626844e2f 100644
--- a/src/mame/drivers/gottlieb.cpp
+++ b/src/mame/drivers/gottlieb.cpp
@@ -200,6 +200,7 @@ VBlank duration: 1/VSYNC * (16/256) = 1017.6 us
 #include "includes/gottlieb.h"
 
 #include "machine/nvram.h"
+#include "machine/rescap.h"
 #include "machine/watchdog.h"
 #include "sound/dac.h"
 #include "speaker.h"
diff --git a/src/mame/drivers/lockon.cpp b/src/mame/drivers/lockon.cpp
index 8a38382647b..ec1497f273e 100644
--- a/src/mame/drivers/lockon.cpp
+++ b/src/mame/drivers/lockon.cpp
@@ -19,6 +19,7 @@
 #include "cpu/nec/nec.h"
 #include "cpu/z80/z80.h"
 #include "machine/adc0808.h"
+#include "machine/rescap.h"
 #include "sound/2203intf.h"
 #include "sound/flt_vol.h"
 #include "speaker.h"
diff --git a/src/mame/drivers/mpu3.cpp b/src/mame/drivers/mpu3.cpp
index 484ca9bc24a..2da8102b82f 100644
--- a/src/mame/drivers/mpu3.cpp
+++ b/src/mame/drivers/mpu3.cpp
@@ -112,6 +112,7 @@ TODO: - Distinguish door switches using manual
 #include "machine/steppers.h"
 #include "machine/roc10937.h"
 #include "machine/meters.h"
+#include "machine/rescap.h"
 
 #include "mpu3.lh"
 
diff --git a/src/mame/drivers/pcw.cpp b/src/mame/drivers/pcw.cpp
index 370639c1611..04b2563e543 100644
--- a/src/mame/drivers/pcw.cpp
+++ b/src/mame/drivers/pcw.cpp
@@ -104,6 +104,7 @@
 // pcw/pcw16 beeper
 #include "sound/beep.h"
 #include "machine/ram.h"
+#include "machine/rescap.h"
 #include "render.h"
 #include "softlist.h"
 #include "speaker.h"
diff --git a/src/mame/machine/mpu4.cpp b/src/mame/machine/mpu4.cpp
index 25ecc5d8c4e..dfb871d00d7 100644
--- a/src/mame/machine/mpu4.cpp
+++ b/src/mame/machine/mpu4.cpp
@@ -264,6 +264,7 @@ TODO: - Distinguish door switches using manual
 
 #include "video/awpvid.h"       //Fruit Machines Only
 
+#include "machine/rescap.h"
 #include "speaker.h"
 
 #include "mpu4.lh"