Différences

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

--- back2root:ibm-pc-ms-dos:interrupts:int_21:int_21_48 [2023/01/10 11:55] – supprimée - modification externe (Unknown date) 127.0.0.1
+++ back2root:ibm-pc-ms-dos:interrupts:int_21:int_21_48 [2023/01/16 17:54] (Version actuelle) – modification externe 127.0.0.1
@@ Ligne 1: / Ligne 1: @@
+====== INT 0x21 - 0x48 - Allocate Memory ======
+===== Request/Call: =====
+{{tablelayout?rowsHeaderSource=Auto&colwidth=""}}
+^  reg  ^  value  ^  descr  ^
+|  AH   |  0x48   |         |
+|  BX   |     | number of memory paragraph requested |
+===== Return: =====
+  * CF set if error
+  * CF cleared if successful
+{{tablelayout?rowsHeaderSource=Auto&colwidth=""}}
+^  reg  ^   descr  ^
+|  AX   | Segment address of allocated memory block (MCB + 1para)\\ error code if CF is set (see [[back2root:ibm-pc-ms-dos:hardware:informations:dos_error_code|DOS Error Code]]) |
+|  BX   | size in paras of the largest block of memory available if CF set, and AX = 08 (Not Enough Mem) |
+===== Notes & Comments =====
+<WRAP round box>
+  * returns segment address of allocated memory block AX:0000
+  * each allocation requires a 16 byte overhead for the MCB
+  * returns maximum block size available if error
+</WRAP>
+[[start|Back]]

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