Changeset 530 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Initialization/Interrupts.asm

Timestamp:

Mar 28, 2013, 1:36:23 PM (11 years ago)

Author:

aitotat@…

google:author:

aitotat@gmail.com

Message:

Changes to XTIDE Universal BIOS:

• AT builds again copy old INT 13h handler to 40h. It turned out it is needed, by XTIDE Universal BIOS at least (fixes disappearing floppy drive hotkey button when booting starts).
• AH=48h no longer returns P-CHS parameteres for drives with more than 15,482,880 sectors (now works like described on Phoenix specification).

File:

• trunk/XTIDE_Universal_BIOS/Src/Initialization/Interrupts.asm (modified) (2 diffs)

trunk/XTIDE_Universal_BIOS/Src/Initialization/Interrupts.asm

@@ -64 +64 @@
     mov     [RAMVARS.fpOldI13h], ax             ; Store old INT 13h offset
 
-%ifdef COPY_13H_HANDLER_TO_40H
     ; Only store INT 13h handler to 40h if 40h is not already installed.
     ; At least AMI BIOS for 286 stores 40h handler by itself and calls
-    ; 40h from 13h. That system locks to infinite loop if we copy 13h to 40h.
+    ; 40h from 13h. That system locks to infinite loop if we blindly copy 13h to 40h.
     call    FloppyDrive_IsInt40hInstalled
     jc      SHORT .Int40hAlreadyInstalled
@@ -73 +72 @@
     mov     [es:BIOS_DISKETTE_INTERRUPT_40h*4+2], dx    ; Store old INT 13h segment
 .Int40hAlreadyInstalled:
-%endif ; COPY_13H_HANDLER_TO_40H
 
     mov     al, BIOS_DISK_INTERRUPT_13h         ; INT 13h interrupt vector offset