From: Toni Wilen <twilen@winuae.net>
Date: Tue, 21 Feb 2023 16:18:10 +0000 (+0200)
Subject: Make sure initial disk position is not negative (new random number generator can... 
X-Git-Tag: 5.0.0~136
X-Git-Url: https://git.unchartedbackwaters.co.uk/w/?a=commitdiff_plain;h=164d021fef25f89fe089c80aaa922719f5f6f142;p=francis%2Fwinuae.git

Make sure initial disk position is not negative (new random number generator can generate full 32-bit values compared to old one)
---

diff --git a/disk.cpp b/disk.cpp
index 9b3a5732..201ff08e 100644
--- a/disk.cpp
+++ b/disk.cpp
@@ -1402,6 +1402,7 @@ static int drive_insert (drive *drv, struct uae_prefs *p, int dnum, const TCHAR
 		drv->useturbo = 0;
 		drv->mfmpos = uaerand();
 		drv->mfmpos |= (uaerand() << 16);
+		drv->mfmpos &= 0xffffff;
 		drv->mfmpos %= drv->tracklen;
 		drv->prevtracklen = 0;
 
@@ -1708,6 +1709,7 @@ static int drive_insert (drive *drv, struct uae_prefs *p, int dnum, const TCHAR
 	drive_fill_bigbuf (drv, 1);
 	drv->mfmpos = uaerand ();
 	drv->mfmpos |= (uaerand () << 16);
+	drv->mfmpos &= 0xffffff;
 	drv->mfmpos %= drv->tracklen;
 	drv->prevtracklen = 0;
 	if (!fake) {