HP Vectra VT 6/xxx HP Vectra XU 6/xxx and VT 6/xxx PCs - Technical Reference M - Page 38

Year Of The Rom Bios Release, Week Of The Rom Bios Release

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For example; BIOS release GG.06.01 would be expressed as: 0601 Note that if you use DEBUG to look at the bytes, the numbers will be reversed (0106). In fact, the BIOS binary code is the same for both PCs. The same program is downloaded in either case. However, when it is run on an HP Vectra VT 6/ xxx PC, it is copied into shadow RAM, as usual, but the "GG" prefix is then overwritten by "GV". YEAR OF THE ROM BIOS RELEASE 0F000:00FEh = Year of ROM BIOS release in Binary Coded Decimal (BCD) Length = one byte Encoding is as follows: yy where yy is the difference between the current year and 1960 in BCD. For example; if the current year is 1995, the year code would be 1995 minus 1960, which is 35h expressed in BCD. WEEK OF THE ROM BIOS RELEASE 0F000:00FFh = Week of the ROM BIOS release in Binary Coded Decimal (BCD) Length = one byte Encoding is as follows: nn where nn is the week in which the BIOS ROMs were released expressed in BCD. The range is 01h to 52h.

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For example; BIOS release GG.06.01 would be expressed as:
0601
Note that if you use DEBUG to look at the bytes, the numbers will be reversed (0106).
In fact, the BIOS binary code is the same for both PCs. The same program is downloaded in either
case. However, when it is run on an
HP Vectra VT 6/ xxx PC
, it is copied into shadow RAM, as
usual, but the “GG” prefix is then overwritten by “GV”.
YEAR OF THE ROM BIOS RELEASE
0F000:00FEh = Year of ROM BIOS release in Binary Coded Decimal (BCD)
Length = one byte
Encoding is as follows:
yy
where
yy
is the difference between the current year and 1960 in BCD.
For example; if the current year is 1995, the year code would be 1995 minus 1960, which is 35h
expressed in BCD.
WEEK OF THE ROM BIOS RELEASE
0F000:00FFh = Week of the ROM BIOS release in Binary Coded Decimal (BCD)
Length = one byte
Encoding is as follows:
nn
where
nn
is the week in which the BIOS ROMs were released expressed in BCD. The range is 01h
to 52h.