From a8633eff6acaff4ff8377a359f19b26e843d0fc2 Mon Sep 17 00:00:00 2001
From: Peter Veenstra <qbix79@users.sourceforge.net>
Date: Wed, 9 May 2018 18:41:47 +0000
Subject: [PATCH] Slight corrections to r4091, CX and DX should not be changed
 for floppies. Changing reported floppy type to one without changeline as we
 don't support that call.

Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@4101
---
 src/ints/bios_disk.cpp | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/src/ints/bios_disk.cpp b/src/ints/bios_disk.cpp
index 87e1abfc..363c02ed 100644
--- a/src/ints/bios_disk.cpp
+++ b/src/ints/bios_disk.cpp
@@ -512,17 +512,19 @@ static Bitu INT13_DiskHandler(void) {
 			Bit64u largesize = tmpheads*tmpcyl*tmpsect*tmpsize;
 			largesize/=512;
 			Bit32u ts = static_cast<Bit32u>(largesize);
-			reg_ah = (drivenum <2)?2:3;
-			reg_cx = static_cast<Bit16u>(ts >>16);
-			reg_dx = static_cast<Bit16u>(ts & 0xffff);
+			reg_ah = (drivenum <2)?1:3; //With 2 for floppy MSDOS starts calling int 13 ah 16
+			if(reg_ah == 3) {
+				reg_cx = static_cast<Bit16u>(ts >>16);
+				reg_dx = static_cast<Bit16u>(ts & 0xffff);
+			}
 			CALLBACK_SCF(false);
 		} else {
 			if (drivenum <DOS_DRIVES && (Drives[drivenum] != 0 || drivenum <2)) {
 				if (drivenum <2) {
 					//TODO use actual size (using 1.44 for now).
-					reg_ah = 0x2; // type
-					reg_cx = 0;
-					reg_dx = 0x2880;
+					reg_ah = 0x1; // type
+//					reg_cx = 0;
+//					reg_dx = 2880; //Only set size for harddrives.
 				} else {
 					//TODO use actual size (using 105 mb for now).
 					reg_ah = 0x3; // type