Path: utzoo!attcan!uunet!mcsun!ukc!stl!siesoft!adrian
From: adrian@siesoft.co.uk (Adrian Hussey)
Newsgroups: comp.sys.ibm.pc.rt
Subject: Re: SCSI on RISC/6000 model 320
Summary: Request for help - ibm pc boot files, modification of
Message-ID: <1990Sep19.125915.14320@siesoft.co.uk>
Date: 19 Sep 90 12:59:15 GMT
References: <5504@mace.cc.purdue.edu>
Sender: adrian@siesoft.co.uk
Organization: Siemens System Developement Group, Reading, UK.
Lines: 29

I'm posting this query for a friend. Any replies, preferably by
email, would be greatly appreciated. Thanks for any help you can
give.

cheers

Adrian Hussey

P.S. Apologies if this is an inappropriate newsgroup - if it is,
information telling me where to go would also be helpful! :-)

============QUESTION===============


I have noticed that the boot file IO.SYS (or IBMBIO.COM) contains large
'blank' areas consisting of long strings of zero bytes.

Can anybody out there tell me:

1) what these blank areas are for.

2) do all IO.SYS or IBMBIOS.COM files contain them.

3) is it safe to alter them; ie. store data/code in them.

I am interested in writing a short modification to the boot routine & these
'blank' areas would seem like a convenient place to put it;

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