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AX = 5758h BL = function 00h ??? 01h get Headroom locationReturn:
CF clear if installed AX = PSP segment of Headroom TSR BX = paragraphs of memory used by Headroom CF set if not (normal DOS return)
Note: This function is also used as an installation check 02h get INT 21 handler
Return:
CF clear ES:BX -> Headroom's INT 21 handler
Note: Also sets unknown flag 03h launch application??? DS:SI -> 233-byte application record
Return:
??? 04h ??? ???Return:
CF clear 05h get swap directoryReturn:
CF clear DX:AX -> ASCIZ swap directory name 06h ??? DX = ???Return:
CF clear 07h ??? 08h ??? 09h get current applicationReturn:
BX = application number 0Ah ??? DX = application number DS:SI = ???Return:
??? 0Bh ??? 0Ch ??? DX = application number ???Return:
??? 0Dh ??? DX = application number ???Return:
??? 0Eh get ???Return:
CF clear AX = ??? 0Fh set ??? flag 10h clear ??? flag 11h find application by name DS:SI -> ASCIZ application nameReturn:
CF clear AX = application number or FFFFh if not loaded 12h ??? DX = application numberReturn:
CF clear ??? 13h ???Return:
CF clear 14h ??? same as function 13h 15h set ??? DX = ??? 16h get ???Return:
AX = ??? set by function 15h 17h get ???Return:
BX = ??? CX = ??? (may be pointer in BX:CX)18h BUG:
Branches incorrectly due to fencepost error
Program: Headroom is a TSR/task switcher by Helix Software
See Also: AX=4C57h - AX=5757h - INT 2F/AX=5758h
Category: Uncatagorized - Int 21h - H
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