INT 15 - SYSTEM - BUILD ABIOS SYSTEM PARAMETER TABLE (PS)
        AH = 04h
        ES:DI -> results buffer length 20h for System Parameter Table
        DS = segment containing ABIOS RAM extensions (zero if none)
Return: AH = 00h success: results at ES:DI
        CF set on failure
SeeAlso: AH=05h"ABIOS",C1h

Format of ABIOS System Parameter Table:
Offset  Size    Description
 00h    DWORD   FAR address of ABIOS Common Start Routine
 04h    DWORD   FAR address of ABIOS Interrupt Routine
 08h    DWORD   FAR address of ABIOS Time-out Routine
 0Ch    WORD    number of bytes of stack required by this ABIOS implementation
 0Eh 16 BYTEs   reserved
 1Eh    WORD    number of entries in initialization table

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