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EBDA - Extended BIOS Data Area EBDA (PS/2)
Offset | Size | Description |
00 | word | number of bytes allocated to EBDA in Kbytes |
01-21 | 21bytes | reserved |
22 | dword | device driver far call pointer |
26 | byte | pointing device flag (1st byte, see below) |
27 | byte | pointing device flag (2nd byte, see below) |
28-2F | 8 bytes | reserved |
Pointing Device Flag Byte 1
bit | Offset 26 |
0-2 | index count |
3 | reserved (0) |
4 | error |
5 | acknowledge |
6 | resend |
7 | command in progress |
Pointing Device Flag Byte 2
|7|6|5|4|3|2|1|0| Offset 27
| | | | | `------- package size
| `-------------- reserved
`--------------- device driver far call flag