Changeset 544 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Handlers

Timestamp:

Apr 17, 2013, 5:16:00 PM (12 years ago)

Author:

aitotat@…

google:author:

aitotat@gmail.com

Message:

Changes to XTIDE Universal BIOS:

• Comparing BX:DX:AX against 15,482,880 sectors now works correctly.
• P-Cylinders are now stored to Compatible DPTs if EBIOS functions are disabled by CHS adressing mode.

File:

• trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/EBIOS/AH48h_GetExtendedDriveParameters.asm (modified) (1 diff)

trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/EBIOS/AH48h_GetExtendedDriveParameters.asm

@@ -136 +136 @@
     ; Store P-CHS. Based on phoenix specification this is returned only if
     ; total sector count is 15,482,880 or less.
-    sub     ax, MAX_SECTOR_COUNT_TO_RETURN_PCHS & 0FFFFh
-    sbb     dx, MAX_SECTOR_COUNT_TO_RETURN_PCHS >> 16
+    sub     ax, (MAX_SECTOR_COUNT_TO_RETURN_PCHS+1) & 0FFFFh
+    sbb     dx, (MAX_SECTOR_COUNT_TO_RETURN_PCHS+1) >> 16
     sbb     bx, cx      ; Zero
-    ja      SHORT .ReturnWithSuccess
+    jnc     SHORT .ReturnWithSuccess
     or      BYTE [di+EDRIVE_INFO.wFlags], FLG_CHS_INFORMATION_IS_VALID