Changeset 568 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/Initialization/DetectDrives.asm

Timestamp:

Dec 21, 2014, 5:37:53 PM (10 years ago)

Author:

krille_n_@…

google:author:

krille_n_@hotmail.com

Message:

Changes:

• SerDrive: Using named pipe mode (serdrive -p) now works under Windows XP/2000/Server 2003.
• checksum.pl: Added a compatibility fix for 3Com 3C503 cards.
• XTIDECFG will now scan every possible segment address to find and load the BIOS and/or its settings from EEPROM. This should simplify things for people using combined option ROMs.
• Fixed a bug from r521 in BootSector.asm where the BIOS would not display a timeout error if it failed to load the boot sector from harddrive.
• Fixed a bug from r541 in CompatibleDPT.asm where CompatibleDPT_CreateDeviceParameterTableExtensionToESBXfromDPTinDSSI would generate an invalid checksum in the DPTE.
• Optimizations and other fixes.

File:

• trunk/XTIDE_Universal_BIOS/Src/Initialization/DetectDrives.asm (modified) (3 diffs)

trunk/XTIDE_Universal_BIOS/Src/Initialization/DetectDrives.asm

@@ -72 +72 @@
 %endif
 
-    mov     al,[cs:ROMVARS.wFlags]          ; Configurator set to always scan?
-    or      al,[es:BDA.bKBFlgs1]            ; Or, did the user hold down the ALT key?
-    and     al,8                            ; 8 = alt key depressed, same as FLG_ROMVARS_SERIAL_ALWAYSDETECT
+    mov     al, [cs:ROMVARS.wFlags]         ; Configurator set to always scan?
+    or      al, [es:BDA.bKBFlgs1]           ; Or, did the user hold down the ALT key?
+    and     al, 8                           ; 8 = alt key depressed, same as FLG_ROMVARS_SERIAL_ALWAYSDETECT
     jnz     .DriveDetectLoop
 %endif
@@ -89 +89 @@
 ;
     mov     cx, [RAMVARS.wDrvCntAndFlopCnt]     ; Our count of hard disks
-
     mov     al, [es:BDA.bHDCount]
-    add     cl, al                      ; Add our drives to the system count
-    mov     [es:BDA.bHDCount], cl
+    add     [es:BDA.bHDCount], cl       ; Add our drives to the system count
     or      al, 80h                     ; Or in hard disk flag
     mov     [RAMVARS.bFirstDrv], al     ; Store first drive number
@@ -118 +116 @@
     inc     ax                              ; low order bit, indicating floppy drive exists
 
-    mov     ah, [es:BDA.wEquipment]         ; Load Equipment WORD low byte
-    and     ah, 03eh                        ; Mask off drive number and drives present bit
+    mov     ah, 3Eh                         ; AND mask to AH (all bits set except floppy drive count/present)
+    and     ah, [es:BDA.wEquipment]         ; Load Equipment WORD low byte and mask off drive number and drives present bit
     or      al, ah                          ; Or in new values
     mov     [es:BDA.wEquipment], al         ; and store
 
-    mov     al, 1eh                         ; BDA pointer to Floppy DPT
+    mov     al, 1Eh                         ; BDA pointer to Floppy DPT
     mov     si, AH8h_FloppyDPT
     call    Interrupts_InstallHandlerToVectorInALFromCSSI