Différences

Ci-dessous, les différences entre deux révisions de la page.

--- back2root:ibm-pc-ms-dos:interrupts:int_21:int_21_3f [2023/01/10 11:55] – supprimée - modification externe (Unknown date) 127.0.0.1
+++ back2root:ibm-pc-ms-dos:interrupts:int_21:int_21_3f [2023/01/16 17:54] (Version actuelle) – modification externe 127.0.0.1
@@ Ligne 1: / Ligne 1: @@
+====== INT 0x21 - 0x3f - Read From File or Device Using Handle ======
+===== Request/Call: =====
+{{tablelayout?rowsHeaderSource=Auto&colwidth=""}}
+^  reg  ^  value  ^  descr  ^
+|  AH   |  0x3f   |         |
+|  BX   |     | file handle |
+|  CX   |     | number of bytes to read |
+|  DS:DX  |   | pointer to read buffer  |
+===== Return: =====
+**CF is cleared : success **
+{{tablelayout?rowsHeaderSource=Auto&colwidth=""}}
+^  reg  ^   descr  ^
+|  AX   | number of bytes readed |
+**CF is set: error **
+{{tablelayout?rowsHeaderSource=Auto&colwidth=""}}
+^  reg  ^   descr  ^
+|  AX   | error code (see [[back2root:ibm-pc-ms-dos:hardware:informations:dos_error_code|DOS Error Code]])  |
+===== Notes & Comments =====
+<WRAP round box>
+  * read specified number of bytes from file into buffer DS:DX
+  * when AX is not equal to CX then a partial read occurred due to end of file
+  * if AX is zero, no data was read, and EOF occurred before read
+</WRAP>
+[[start|Back]]

Nox-Rhea WiKi