From 43a835fddec739b4399cb4b0aad33236fee6ca1a Mon Sep 17 00:00:00 2001
From: "H.J.Berends" <112617808+b3rendsh@users.noreply.github.com>
Date: Sat, 11 Oct 2025 12:00:56 +0200
Subject: [PATCH 1/2] Update loader for MSX

---
 Source/MSX/msx-ldr.asm | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/Source/MSX/msx-ldr.asm b/Source/MSX/msx-ldr.asm
index e2d04ec5..0e264310 100644
--- a/Source/MSX/msx-ldr.asm
+++ b/Source/MSX/msx-ldr.asm
@@ -10,9 +10,12 @@
 
 ROMWBW_SEG	.equ	4			; RomWBW boot segment
 
+RDSLT		.equ	$000c			; read value of address in other slot
+CALSLT		.equ	$001c			; inter-slot call routine
 CHGCPU		.equ	$0180			; changes CPU mode
-P2_SEG  	.equ     $f2c9	          	; current segment page 2 (MSX-DOS 2)
+P2_SEG  	.equ	$f2c9	          	; current segment page 2 (MSX-DOS 2)
 CSRSW		.equ	$fca9			; cursor on/off flag
+MNROM		.equ	$fcc1			; main system rom slot
 H_TIMI		.equ	$fd9f			; timer interrupt hook (vdp vsync)
  
 ; ------------------------------------------------------------------------------
@@ -117,13 +120,18 @@ mtcount:	call	H_TIMI			; H.TIMI handler saves register AF
 		dec	a
 		jr	nz,mtcount
 
-		; set CPU to Z80 mode
-		ld	a,(CHGCPU)
-		cp	$c3
-		ld	a,$80			; set Z80 mode + switch Turbo LED indicator
-		call	z,CHGCPU		
+		; set CPU to Z80 mode / turbo off
+		ld	hl,CHGCPU
+		ld	a,(MNROM)
+		call	RDSLT			; routine to change CPU mode exists in BIOS?
+		cp	$c3			; z=yes
+		ld	a,$80			; Z80 mode + switch Turbo LED indicator
+		ld	ix,CHGCPU		; change CPU routine
+		ld	iy,(MNROM-1)		; in main rom
+		call	z,CALSLT
 
 		; select RomWBW bootloader bank and start RomWBW
+		di
 		ld	a,ROMWBW_SEG
 		out	($fc),a
 		inc	a

From 2d77d4f03640dcc921dcbecdd7c39664b4df0642 Mon Sep 17 00:00:00 2001
From: "H.J.Berends" <112617808+b3rendsh@users.noreply.github.com>
Date: Sat, 11 Oct 2025 13:21:16 +0200
Subject: [PATCH 2/2] Added IDE driver detect option

---
 Doc/ChangeLog.txt           | 1 +
 Source/HBIOS/cfg_MASTER.asm | 1 +
 Source/HBIOS/cfg_MSX.asm    | 1 +
 Source/HBIOS/ide.asm        | 7 +++++++
 4 files changed, 10 insertions(+)

diff --git a/Doc/ChangeLog.txt b/Doc/ChangeLog.txt
index 4317223b..ea905135 100644
--- a/Doc/ChangeLog.txt
+++ b/Doc/ChangeLog.txt
@@ -31,6 +31,7 @@ Version 3.6
 - M?R: Update Timer app with "zero" option
 - HJB: Update PPIDE driver, add support for MSX BEER IDE interface
 - HJB: Added loader for MSX
+- HJB: Added IDE driver master media detect option
 
 Version 3.5.1
 -------------
diff --git a/Source/HBIOS/cfg_MASTER.asm b/Source/HBIOS/cfg_MASTER.asm
index 6e987846..07f13fb6 100644
--- a/Source/HBIOS/cfg_MASTER.asm
+++ b/Source/HBIOS/cfg_MASTER.asm
@@ -338,6 +338,7 @@ RFENABLE	.EQU	FALSE		; RF: ENABLE RAM FLOPPY DRIVER
 RFCNT		.EQU	1		; RF: NUMBER OF RAM FLOPPY UNITS (1-4)
 ;
 IDEENABLE	.EQU	FALSE		; IDE: ENABLE IDE DISK DRIVER (IDE.ASM)
+IDEDETECTMEDIA	.EQU	FALSE		; IDE: PROBE FOR MEDIA IN MASTER UNIT, IF NOT DETECTED THEN DON'T ENABLE DRIVER
 IDETRACE	.EQU	1		; IDE: TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
 IDECNT		.EQU	1		; IDE: NUMBER OF IDE INTERFACES TO DETECT (1-3), 2 DRIVES EACH
 IDE0MODE	.EQU	IDEMODE_NONE	; IDE 0: DRIVER MODE: IDEMODE_[DIO|DIDE|MK4|RC|GIDE]
diff --git a/Source/HBIOS/cfg_MSX.asm b/Source/HBIOS/cfg_MSX.asm
index 13e1f374..72c56afc 100644
--- a/Source/HBIOS/cfg_MSX.asm
+++ b/Source/HBIOS/cfg_MSX.asm
@@ -282,6 +282,7 @@ FD1TYPE		.SET	FDT_3HD		; FD 1: DRIVE TYPE: FDT_[3DD|3HD|5DD|5HD|8]
 RFENABLE	.SET	FALSE		; RF: ENABLE RAM FLOPPY DRIVER
 ;
 IDEENABLE	.SET	TRUE		; IDE: ENABLE IDE DISK DRIVER (IDE.ASM)
+IDEDETECTMEDIA	.SET	TRUE		; IDE: PROBE FOR MEDIA IN MASTER UNIT, IF NOT DETECTED THEN DON'T ENABLE DRIVER
 IDETRACE	.SET	1		; IDE: TRACE LEVEL (0=NO,1=ERRORS,2=ALL)
 IDECNT		.SET	1		; IDE: NUMBER OF IDE INTERFACES TO DETECT (1-3), 2 DRIVES EACH
 IDE0MODE	.SET	IDEMODE_RC	; IDE 0: DRIVER MODE: IDEMODE_[DIO|DIDE|MK4|RC|GIDE]
diff --git a/Source/HBIOS/ide.asm b/Source/HBIOS/ide.asm
index 96d2626b..c365f8e1 100644
--- a/Source/HBIOS/ide.asm
+++ b/Source/HBIOS/ide.asm
@@ -610,8 +610,15 @@ IDE_DETECT:
 ;#IF (IDEMODE == IDEMODE_DIO)
 ;#ENDIF
 ;
+#IF (IDEDETECTMEDIA)
+	; PROBE FOR MEDIA IN MASTER UNIT, IF NOT DETECTED THEN DON'T ENABLE DRIVER
+	LD	A,IDE_DRVMASTER
+	LD	(IDE_DRVHD),A
+	JP	IDE_PROBE
+#ELSE
 	XOR	A			; SIGNAL SUCCESS
 	RET				; AND RETURN
+#ENDIF
 ;
 ;=============================================================================
 ; DRIVER FUNCTION TABLE