Category: DOS extenders
Flags: available only in protected mode
INT 21 - Phar Lap 386/DOS-Extender - CALL REAL-MODE PROCEDURE, REGISTERS AX = 2510h EBX = CS:IP of real-mode procedure to call ECX = number of two-byte words to copy to protected-mode stack to real-mode stack DS:EDX -> pointer to parameter block (see #01360) Return: CF clear if successful all segment registers unchanged, EDX unchanged all other general registers contain values set by real-mode proc all other flags are set as they were left by real-mode procedure real-mode register values are returned in the parameter block CF set on error EAX = error code 01h not enough real-mode stack space Note: unlike most of the preceding 25xxh functions, this one is not supported by FlashTek X-32VM SeeAlso: AX=250Eh,AX=250Fh