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Function 55h "Used Internally by DOS" - Create "Child" PSP

* Create PSP: similar to function 26h (which creates a new Program

Segment Prefix at segment in DX) except creates a "child" PSP

rather than copying the existing one.

entry AH 55h

DX segment number at which to create new PSP.

return unknown

note 1) This call is similar to call 26h which creates a PSP except that unlike

call 26h the segment address of the parent process is obtained from the

current process ID rather than from the CS value on the stack (from the

INT 21h call). DX has the new PSP value and SI contains the value to be

placed into PSP:2 (top of memory).

2) Function 55 is merely a substitute for function 26h. It will copy the

current PSP to the segment address DX with the addition that SI is

assumed to hold the new memory top segment. This means that function

26h sets SI to the segment found in the current PSP and then calls

function 55h.




file: /Techref/INT/21f/55.htm, 1KB, , updated: 1999/2/20 11:26, local time: 2024/5/24 19:04,
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