detailed test results
detailed test results
Is it an original IBM or some clone?
It is a clone (with 640kb memory onboard, speed 4,77 Mhz or 8,00 MHz).
I also own a original IBM mainboard ( 256kb system board without ram extensions) and I make the same tests in this moment.
Both mainboards have the same behavior. There is nearly no difference (see detailed test results).
Are hard disk detection strings and boot menu displayed? If not, then this might be related to late initialization. If no floppy or hard disks are found during POST, main BIOS probably won't ever call boot strap loader to start XTIDE late initialization.
XTIDE boot menu will be displayed all time.
My test results:
Harddisk: D3755 (NEC 100MB capacity)
Operating System: MS-DOS V6.22
8-bit VGA-Graphic Adapter
Original IBM Floppy Controller (Clone + IBM Board identically
floppy boot -> OK
hard disk boot -> OK
Without any Floppy Controller (Clone + IBM Board identcially)
floppy boot -> not possible, no controller installed
hard disk boot
boot menu displays "D3755" string correctly, message "80h ... boot sector found", next message not in english, translation: "Please insert a system disk". It's seems to be a message from MBR, because its in the language of the operating system.
Multi I/O Card with Floppy Controller and RTC
floppy boot -> OK
hard disk boot
----> Clone-Board: boot menu displays at cold boot a wrong string, missing first characters. displays "5" or "755" it varied. Next message "no valid boot sector". After a warm boot, the string "D3755" is shown correctly, but still "no valid boot sector".
----> IBM-Board: boot menu displays string "D3755" correctly, next "boot sector found" and then the system hang up. (No message from operating system)
Does the Multi I/O card has BIOS of its own?
No, there is no EEPROM. Just UM8272A, MM58167 (RTC), NS8250N and some logic chips.
Can you boot from floppy drive using boot menu?
Yes, see test results above.
Did you remember to update BIOS configuration when you tried other I/O port? Try port 340h and make sure that both XTIDE card and BIOS are configured properly.
Yes I updated BIOS configuration and change dip switches. I verifiy this with booting from HDD with the IBM Controller. I tried 0x300, 0x380 and now 0x340 but the above test results are the same.