Changeset 82154 in vbox for trunk/src

Timestamp:

Nov 25, 2019 8:32:02 AM (5 years ago)

Author:

vboxsync

Message:

VGABIOS: Flipped inverted BDA bit.

File:

• trunk/src/VBox/Devices/Graphics/BIOS/vgabios.c (modified) (3 diffs)

trunk/src/VBox/Devices/Graphics/BIOS/vgabios.c

@@ -173 +173 @@
     bda[BIOSMEM_CHAR_HEIGHT] = 16;
     /* Clear the screen. */
-    bda[BIOSMEM_VIDEO_CTL]   = 0x68;
+    bda[BIOSMEM_VIDEO_CTL]   = 0x60;
     /* Set the basic screen we have. */
     bda[BIOSMEM_SWITCHES]    = 0xf9;
@@ -520 +520 @@
 
   /* Check if VGA is active. If not, just write the input to the CRTC. */
-  if (read_byte(BIOSMEM_SEG, BIOSMEM_VIDEO_CTL) & 8) {
+  if (!(read_byte(BIOSMEM_SEG, BIOSMEM_VIDEO_CTL) & 8)) {
     /* Trying to disable the cursor? */
     if ((CH & 0x60) == 0x20) {
@@ -852 +852 @@
  write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS,theightm1);
  write_word(BIOSMEM_SEG,BIOSMEM_CHAR_HEIGHT,cheight);
- write_byte(BIOSMEM_SEG,BIOSMEM_VIDEO_CTL,(0x68|noclearmem));
+ write_byte(BIOSMEM_SEG,BIOSMEM_VIDEO_CTL,(0x60|noclearmem));
  write_byte(BIOSMEM_SEG,BIOSMEM_SWITCHES,0xF9);
  write_byte(BIOSMEM_SEG,BIOSMEM_MODESET_CTL,read_byte(BIOSMEM_SEG,BIOSMEM_MODESET_CTL)&0x7f);