diff --git a/Source/HBIOS/Config/RCEZ80_std.asm b/Source/HBIOS/Config/RCEZ80_std.asm
index 93129cff..ecebca31 100644
--- a/Source/HBIOS/Config/RCEZ80_std.asm
+++ b/Source/HBIOS/Config/RCEZ80_std.asm
@@ -46,7 +46,7 @@
 ;
 #INCLUDE "cfg_RCEZ80.asm"
 ;
-CPUOSC		.SET	18432000	; CPU OSC FREQ IN MHZ
+CPUOSC		.SET	20000000	; CPU OSC FREQ IN MHZ
 ;
 FPLED_ENABLE	.SET	TRUE		; FP: ENABLES FRONT PANEL LEDS
 FPSW_ENABLE	.SET	TRUE		; FP: ENABLES FRONT PANEL SWITCHES
diff --git a/Source/HBIOS/cfg_RCEZ80.asm b/Source/HBIOS/cfg_RCEZ80.asm
index 033d2e7d..2f3e67f4 100644
--- a/Source/HBIOS/cfg_RCEZ80.asm
+++ b/Source/HBIOS/cfg_RCEZ80.asm
@@ -60,7 +60,7 @@ AUTOCON		.SET	TRUE		; ENABLE CONSOLE TAKEOVER AT LOADER PROMPT
 ;
 CPUSPDCAP	.SET	SPD_FIXED	; CPU SPEED CHANGE CAPABILITY SPD_FIXED|SPD_HILO
 CPUSPDDEF	.SET	SPD_HIGH	; CPU SPEED DEFAULT SPD_UNSUP|SPD_HIGH|SPD_LOW
-CPUOSC		.SET	18432000	; CPU OSC FREQ IN MHZ
+CPUOSC		.SET	20000000	; CPU OSC FREQ IN MHZ
 INTMODE		.SET	1		; INTERRUPTS: 0=NONE, 1=MODE 1, 2=MODE 2, 3=MODE 3 (Z280)
 DEFSERCFG	.SET	SER_115200_8N1 | SER_RTS	; DEFAULT SERIAL LINE CONFIG (SEE STD.ASM)
 ;