Path: utzoo!utgpu!water!watmath!clyde!att!rutgers!apple!bloom-beacon!husc6!wjh12!djb
From: djb@wjh12.harvard.edu (David J. Birnbaum)
Newsgroups: comp.sys.ibm.pc
Subject: Overlays
Keywords: overlay
Message-ID: <311@wjh12.harvard.edu>
Date: 27 Sep 88 21:21:22 GMT
Reply-To: djb@wjh12.UUCP (David J. Birnbaum)
Distribution: na
Organization: Harvard University, Cambridge MA
Lines: 23

I am a novice 8088 assembly programmer trying to write an overlay for
XyWrite (word processor).  The manufacturer sent me a sample dummy
program and explained what information is passed in what registers
to the overlay.  Apparently, the overlay manager is already built
into XyWrite; if I write my overlay and call it HYPHEN.OVR (it's
a supplementary hyphenation routine) XyWrite will know when to call
it.

I would be grateful for advice on how to assemble and link this
type of overlay.  I know how to produce .OBJ, .EXE, and .COM files,
but how do I produce an independent overlay file?  I can email the
dummy program (it's only about 20 lines) along with the information
from XyQuest (about one page) to anyone who would be willing to offer
advice.

Please email replies to djb@wjh12.harvard.edu (Internet) or
djb@harvunxw.bitnet (Bitnet).  If there's a lot of interest I'll
post a summary; otherwise, let me know if you'd like a summary by
email.

--David J. Birnbaum