diff --git a/src/mame/drivers/cps2.c b/src/mame/drivers/cps2.c
index 9b3ef8f5741..c785c28c8df 100644
--- a/src/mame/drivers/cps2.c
+++ b/src/mame/drivers/cps2.c
@@ -482,7 +482,7 @@ CAPCOM CPB-001A
 |                    |
 |      IC1           |
 |                    |
-| IC2      IC3       |
+| IC3      IC2       |
 |                    |
 |                    |
 |                    |
diff --git a/src/mame/includes/cps1.h b/src/mame/includes/cps1.h
index d8e7bd75f16..437a96799b5 100644
--- a/src/mame/includes/cps1.h
+++ b/src/mame/includes/cps1.h
@@ -17,6 +17,14 @@
 // measured clocks:
 // CPS2(Guru): V = 59.6376Hz, H = 15,4445kHz *H is probably measured too low!
 // CPS1 GNG: V = 59.61Hz
+/* CPS1(Charles MacDonald):
+    Pixel clock: 8.00 MHz
+    Total pixel clocks per scanline: 512 clocks
+    Horizontal sync pulse width : 36 clocks
+    Horizontal display and blanking period: 476 clocks
+    Frame size: 262 scanlines
+    Refresh rate: 59.63 MHz.
+*/
 #define CPS_PIXEL_CLOCK  (XTAL_16MHz/2)
 
 #define CPS_HTOTAL       (512)