System16 Info Block
This is the System16 Info Block. It's content is mostly filled in by System16 at bootup. The values here are for system use, but can be usefull for some appliciations aswell... This table is located IN the code-segment of System16. System16 will always be loaded at 500h. It starts with 100h zeros. So to get for example the physical address of the KeyboardArea, this assemblercode could retrieve it:
mov eax, gs:[600h+74]
Provided that GS is loaded with the descriptor that covers memory 00000000 to 4Gig(As it always should under V2_OS).
Offsets are given in decimal values here:

Ofs Size Description
4 1 System16Sectors
This value is used by Boot.com to find out how many sectors to load into memory before passing control to System16. Multiply this value by 512 to get the size of System16 in bytes.
5 1 System32Sectors
This value is used by System16 to find out how many sectors to load into memory before passing control to System32. Multiply this value by 512 to get the size of System32 in bytes.
6 4 System16 Addr
This value is the physical Base address of System16's code Descriptor. This value is currenly fixed to 500h
Note that System16's code starts with 100h bytes of zero's.
10 4 System32 Addr
This value is the physical Base address of System32's code Descriptor. It starts right after System16's code. Note that System32 also starts with 100h bytes of zero's.
14 2 The RealMode Portal Segment
16 2 The RealMode Portal Offset
18 2 The IDT Length (in Bytes)
20 4 The IDT physical base address
24 2 The GDT Length (in Bytes)
26 4 The GDT physical base address
30 4 The physical base address of the 'Shared Stack-Space'
34 4 Size in bytes of the 'Shared Stack-Space'
38 2 System16Function Offset
40 4 System16Function's Return Address
44 4 Real_EAX
48 4 Real_EBX
52 4 Real_ECX
56 4 Real_EDX
60 4 Real_ESI
64 4 Real_EDI
68 2 Real_DS
70 2 Real_ES
72 2 Real_FS
74 4 The physical base address of the 'Keyboard Area' More...
78 2 Bootup GDT
80 2 GDT_Entries
82 2 Diskbuffer Segment
84 4 Diskbuffer Size in bytes
88 2 Number of Fixed Disks
90 2 Offset to the DiskInfoBlock (Relative to System16's Base Address) More...
92 2 Reserved
94 1 (BIOS)Drive number of the disk that V2_OS Booted from
95 4 Address of the CMOS data-image(Copied from NVRam by System16 at bootup)
99 1 Reserved
100 4 Found_Cylinder
104 4 Found_Head
108 4 Found_Sector
112 2 Offset to the PartitionList(Relative to System16's Base Address) More...
114 2 Number of floppydrives present in the system
116 4 ModList Address More...
120 4 ModList Size in bytes
124 4 ServerList Address More...
128 4 ServerList Size in Bytes
128 ... Reserved