diff --git a/Source/HBIOS/Config/RCEZ80_std.asm b/Source/HBIOS/Config/RCEZ80_std.asm
index bd8a9527..0800c3b1 100644
--- a/Source/HBIOS/Config/RCEZ80_std.asm
+++ b/Source/HBIOS/Config/RCEZ80_std.asm
@@ -43,10 +43,10 @@ LPTENABLE	.SET	FALSE		; LPT: ENABLE CENTRONICS PRINTER DRIVER (LPT.ASM)
 TMSENABLE	.SET	TRUE		; TMS: ENABLE TMS9918 VIDEO/KBD DRIVER (TMS.ASM)
 TMSTIMENABLE	.SET	FALSE		; TMS: ENABLE TIMER INTERRUPTS (REQUIRES IM1)
 TMSMODE		.SET	TMSMODE_MSX9958	; TMS: DRIVER MODE: TMSMODE_[SCG|N8|MBC|MSX|MSX9958|MSXKBD|COLECO]
-MKYENABLE	.SET	FALSE		; MSX 5255 PPI KEYBOARD COMPATIBLE DRIVER (REQUIRES TMS VDA DRIVER)
+MKYENABLE	.SET	TRUE		; MSX 5255 PPI KEYBOARD COMPATIBLE DRIVER (REQUIRES TMS VDA DRIVER)
 VRCENABLE	.SET	FALSE		; VRC: ENABLE VGARC VIDEO/KBD DRIVER (VRC.ASM)
 EFENABLE	.SET	FALSE		; EF: ENABLE EF9345 VIDEO DRIVER (EF.ASM)
-VDAEMU_SERKBD	.SET	0		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
+VDAEMU_SERKBD	.SET	$FF		; VDA EMULATION: SERIAL KBD UNIT #, OR $FF FOR HW KBD
 ;
 AY38910ENABLE	.SET	FALSE		; AY: AY-3-8910 / YM2149 SOUND DRIVER
 AYMODE		.SET	AYMODE_RCZ80	; AY: DRIVER MODE: AYMODE_[SCG|N8|RCZ80|RCZ180|MSX|LINC]
diff --git a/Source/HBIOS/mky.asm b/Source/HBIOS/mky.asm
index 34650e82..5cddbcfb 100644
--- a/Source/HBIOS/mky.asm
+++ b/Source/HBIOS/mky.asm
@@ -211,8 +211,10 @@ MKY_INIT:
 	; C - OUTPUT (ROW LINE SELECTION)
 
 	LD	A, PPICMD_COMMAND | PPICMD_GA_MODE_0 | PPICMD_GB_MODE_0 | PPICMD_A_IN | PPICMD_B_IN | PPICMD_CLOW_OUT | PPICMD_CHIGH_OUT
+	EZ80_IO
 	OUT	(MKY_REGCMD), A
 	LD	A, 64			; CAPS OFF
+	EZ80_IO
 	OUT	(MKY_REGC), A
 	RET
 ;
@@ -368,8 +370,10 @@ MKY_SETLEDS:
 ; TURN THE CAPS LED LIGHT ON
 ;
 MKY_LEDCAPSON:
+	EZ80_IO
 	IN	A, (MKY_REGC)
 	RES	6, A
+	EZ80_IO
  	OUT	(MKY_REGC), A
 	RET
 ;
@@ -378,8 +382,10 @@ MKY_LEDCAPSON:
 ; TURN THE CAPS LED LIGHT OFF
 ;
 MKY_LEDCAPSOFF:
+	EZ80_IO
 	IN	A, (MKY_REGC)
 	SET	6, A
+	EZ80_IO
  	OUT	(MKY_REGC), A
 	RET
 
@@ -740,6 +746,7 @@ MKY_INTSCAN1:
 
 ; SCAN KEYBOARD AND STORE ALL COLUMN RESULTS PER ROW AT MKY_NEWKEY
 ;
+	EZ80_IO
 	IN      A, (MKY_REGC)			; READ AND MASK THE CURRENT STATE OF PPI PORT C
 	AND     $F0
 	LD      D, A
@@ -747,7 +754,9 @@ MKY_INTSCAN1:
 	LD      HL, MKY_NEWKEY
 	LD	C, MKY_REGC
 MKY_SCAN_LP:
+	EZ80_IO
 	OUT     (C), D				; SET ACTIVE ROW
+	EZ80_IO
 	IN      A, (MKY_REGB)			; READ ACTIVE COLUMN DATA
 	LD      (HL), A				; STORE COLUMN READ VALUE
 	INC     HL
diff --git a/Source/HBIOS/tms.asm b/Source/HBIOS/tms.asm
index 25b48e53..114fd001 100644
--- a/Source/HBIOS/tms.asm
+++ b/Source/HBIOS/tms.asm
@@ -253,8 +253,6 @@ TMS_INIT:
 ;
 TMS_INIT1:
 #IF (TMSTIMENABLE)
-	EZ80_UTIL_DEBUG
-
 	PRTS(" INTERRUPT ENABLED$")
 
 #ENDIF
@@ -1111,11 +1109,6 @@ TMS_TSTINT:
 	RET
 
 TMS_INTHNDL:
-
-;#IF MKYENABLE
-;	CALL	MKY_INT
-;#ENDIF
-
 	CALL	HB_TIMINT		; RETURN NZ - HANDLED
 	OR	$FF
 	RET