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From: milan@MJM.XYPLEX.COM (Milan Merhar)
Newsgroups: comp.lang.forth
Subject: Accessing extended memory from FPC
Message-ID: <9104171853.AA05073@ucbvax.Berkeley.EDU>
Date: 17 Apr 91 17:02:58 GMT
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Sender: daemon@ucbvax.BERKELEY.EDU
Reply-To: Milan Merhar <milan%MJM.XYPLEX.COM@SCFVM.GSFC.NASA.GOV>
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Hoo boy....You're not talking about a DOS interrupt, but a BIOS internal
function instead.  My copy of the IBM-AT technical reference describes
"INT 15 - Function 87H - Move Block" on page 5-149 of the "BIOS 1" listings.

The calling parameters take up about a page of itsy tiny text, so I suggest
that you hunt up a copy of the manual for yourself. I presume that all of
the compatible BIOS'es implement this function; it's used by the VDISK
driver that IBM provided with DOS for the AT.

As for accessing it from FPC, I don't know. You have to set up the ES:SI
register set as well as AH and CX registers and a parameter list in RAM.
I haven't checked to see what registers FPC allows free use of on a
DOS interrupt call...