Toshiba Satellite 1700 Series, Maintenance Manual

Page: 121 / 156

3 Tests and Diagnostics 3.8 KB-BIOS command support with SYSTEM-BIOS
Satellite 1700 Series Maintenance Manual 3-33
4Ch: Read data from EEPROM (two-byte address)
2nd: Slave address of device
3rd: Lo byte address, which is written into EEPROM
4th: Hi byte address, which is written into EEPROM
Return: data byte from EEPROM if return is FEh then read error.
4Dh: Write data to EEPROM
2nd: address, which is written into EEPROM
3rd: data of write
Return:0=Write OK, Other = Fail
4Eh: Read data from EEPROM
2nd: address, which is read from EEPROM
Return: data byte from EEPROM if return is FEh then read error.
4Fh: Reserved
3.8.2 Command set 50h-5Fh for OEM defined through Port60/64
50h: Reserved
51h: Get revision number of KB-BIOS
Return: BIOS Rev. 3 bytes
Byte0: bit0-bit2 = major number (0-7)
Bit3-bit7 = type of KB-BIOS current only support three country
Keyboard BIOS (A/J/K),e.g. 0 = A, 1=B and or so..
Byte1: bit4-bit7 = 1’st minor revision number (0-9)
bit0-bit3 = 2’nd minor revision number (0-9)
Byte2: bit0-bit3 = verify byte(0-15),If it is 00h then system display “ROM”,
other It is “T01” if it is 01h and so on.. .,
bit4-bit7 = Reserved
Example: The system should display the following if 51BIOS returns three
bytes(09h,02h,00h)