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back2root:ibm-pc-ms-dos:hardware:informations:edba [2023/01/16 17:54] – supprimée - modification externe (Unknown date) 127.0.0.1 | back2root:ibm-pc-ms-dos:hardware:informations:edba [2023/01/16 18:03] (Version actuelle) – [Tableau] frater | ||
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+ | ====== EBDA - Extended BIOS Data Area EBDA (PS/2) ====== | ||
+ | {{tablelayout? | ||
+ | ^ Offset | ||
+ | | 00 | word | number of bytes allocated to EBDA in Kbytes | ||
+ | | 01-21 | ||
+ | | 22 | dword | device driver far call pointer | ||
+ | | 26 | byte | pointing device flag (1st byte, see [[# | ||
+ | | 27 | byte | pointing device flag (2nd byte, see [[# | ||
+ | | 28-2F | ||
+ | |||
+ | ===== Pointing Device Flag Byte 1 ===== | ||
+ | {{anchor: | ||
+ | {{tablelayout? | ||
+ | ^ 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 ===== | ||
+ | {{anchor: | ||
+ | {{tablelayout? | ||
+ | ^ bit ^ Offset 27 ^ | ||
+ | | 0-2 | package size | | ||
+ | | 3-6 | reserved | ||
+ | | 7 | device driver far call flag | | ||
+ | |||
+ | ===== Notes ===== | ||
+ | <WRAP round box> | ||
+ | * EBDA is located in highest memory just under 640K on PS/2 | ||
+ | * word at [[back2root: | ||
+ | </ |