July 2001 News Archive
It appears that Microsoft in the infinite wisdom that it has, decided that certain Cyrix chips were not "true" Pentium class processors, and wiped out the possibility of upgrading for those poor souls who were foolish enough to buy machines using its chips - and presumably the Big Blue microprocessors which are their spitting images"
The relationship between the computer hardware and the bit-fields is given in the following table.
double word | offset | length | bit-field value based on
------------+--------+--------+----------------------------
H1 | 0 | 10 | volume serial number string
| | | of system volume
H1 | 10 | 10 | network adapter MAC address
| | | string
H1 | 20 | 7 | CD-ROM drive hardware
| | | identification string
H1 | 27 | 5 | graphics adapter hardware
| | | identification string
H2 | 0 | 3 | unused, set to 001
H2 | 3 | 6 | CPU serial number string
H2 | 9 | 7 | harddrive hardware
| | | identification string
H2 | 16 | 5 | SCSI host adapter hardware
| | | identification string
H2 | 21 | 4 | IDE controller hardware
| | | identification string
H2 | 25 | 3 | processor model string
H2 | 28 | 3 | RAM size
H2 | 31 | 1 | 1 = dockable
| | | 0 = not dockable
Bit 31 of H2 specifies, whether the
bit-fields represent a notebook computer that supports a docking station. If
docking is possible, the activation mechanism will be more tolerant with
respect to future hardware modifications.
Quote from ArsTechnica: