Changeset 501 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Initialization

Timestamp:

Jan 26, 2013, 4:58:50 PM (12 years ago)

Author:

aitotat@…

google:author:

aitotat@gmail.com

Message:

Changes to XTIDE Universal BIOS:

• XTIDE rev 2 and modded XTIDE rev 1 work again (fixed A0<->A3 swap when accessing Control Block Registers).
• System INT 13h handler is no longer copied to INT 40h (testing if something uses INT 40h).
• Removed controller hardware reset: now AH=0h and AH=Dh will only re-initialize drives (SB16 Tertiary and Quaternary IDE should now be safe to use when using Secondary IDE).

File:

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

trunk/XTIDE_Universal_BIOS/Src/Initialization/Interrupts.asm

@@ -63 +63 @@
     mov     ax, [es:BIOS_DISK_INTERRUPT_13h*4]  ; Load old INT 13h offset
     mov     [RAMVARS.fpOldI13h], ax             ; Store old INT 13h offset
+
+    ; NOTE! Installing INT 40h handler is currently uncommented to test
+    ; if it is really needed. I suspect that it is not. Many bytes can be
+    ; saved if INT 40h related code can be removed.
+%if 0
 
     ; Only store INT 13h handler to 40h if 40h is not already installed.
@@ -72 +77 @@
     mov     [es:BIOS_DISKETTE_INTERRUPT_40h*4+2], dx    ; Store old INT 13h segment
 .Int40hAlreadyInstalled:
+%endif ; 0
 
     mov     al, BIOS_DISK_INTERRUPT_13h         ; INT 13h interrupt vector offset