Changeset 28 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Inc/emulate.inc

Timestamp:

Aug 1, 2010, 5:57:24 PM (14 years ago)

Author:

aitotat

google:author:

aitotat

Message:

• v1.1.1 broke booting from foreign drives, it is now fixed.
• Improved error handling a bit.
• Longer DRQ and IRQ timeouts to minimize write timouts with some (bad) CF cards.
• Default boot menu drive should now be properly selected.

File:

• trunk/XTIDE_Universal_BIOS/Inc/emulate.inc (modified) (1 diff)

trunk/XTIDE_Universal_BIOS/Inc/emulate.inc

@@ -152 +152 @@
 %ifndef USE_386
     %ifidni %1, ax
-        xor     ax, ax
         mov     al, %2
+        xor     ah, ah
     %elifidni %1, bx
         mov     bl, %2
         xor     bh, bh      ; %2 may use BX in effective address
     %elifidni %1, cx
-        xor     cx, cx
         mov     cl, %2
+        xor     ch, ch
     %elifidni %1, dx
-        xor     dx, dx
         mov     dl, %2
+        xor     dh, dh
     %else   ; SI, DI, BP (all may be used in effective address)
         push    ax
-        xor     ax, ax
         mov     al, %2
+        xor     ah, ah
         xchg    ax, %1
         pop     ax