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back2root:ibm-pc-ms-dos:interrupts:int_21:int_21_48
Table des matières
INT 0x21 - 0x48 - Allocate Memory
Request/Call:
| reg | value | descr |
|---|---|---|
| AH | 0x48 | |
| BX | number of memory paragraph requested |
Return:
- CF set if error
- CF cleared if successful
| reg | descr |
|---|---|
| AX | Segment address of allocated memory block (MCB + 1para) error code if CF is set (see 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
- 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
back2root/ibm-pc-ms-dos/interrupts/int_21/int_21_48.txt · Dernière modification : 2023/01/16 17:54 de 127.0.0.1
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