NEC CP/M-86 - Page 70

Basic Disk Operating System (BDOS) Functions
4-36
GET ABSOLUTE MAXIMUM MEMORY
ENTRY.
CL: 36H
DX:
Offset
ofMCB
FUNCTION 54
GET ABS MAX
RETURN
AL: Return Code
The Get Absolute Maximum Memory function finds the largest possible region at
the absolute paragraph boundary given by M-Base, for a maximum of M-Length
paragraphs. If successful, M-Length is set to the actual length. If no memory is
available at the absolute address, AL returns the value OFFH.
ALLOCATE MEMORY
ENTRY
CL: 37H
DX:
Offset
ofMCB
RETURN
FUNCTION 55
AL: Return Code
ALLOC MEM
The Allocate Memory function allocates a memory area according to the MCB
addressed by DX. The allocation request size is obtained from M-Length. Function
55 returns the base paragraph address of the allocated region in the user's MCB.
Register
AL contains OOH if the request was successful and OFFH if the memory
could not be allocated.
ALLOCATE ABSOLUTE MEMORY
ENTRY
CL: 38H
DX:
Offset
ofMCB
FUNCTION 56
ALLOC ABS MEM
RETURN
AL: Return Code
The Allocate Absolute Memory function allocates a memory area according to the
MCB addressed by DX. The allocation request size is obtained from M-Length, and
the absolute base address from M-Base. Register AL contains OOH if the request was
successful
and OFFH if the memory could not be allocated.