From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Eric des Courtis" <eric.des.courtis@gmail.com>
Subject: Re: BCC, ELKS 24 Bit addressing mode
Date: Thu, 23 Mar 2006 18:00:49 -0500
Message-ID: <539da8a30603231500p70c32240hb164771008d88e9e@mail.gmail.com>
References: <4422801D.2000006@sentvion.com> <4422FCBB.3040805@nc.rr.com>
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To: Jody <jbruchon@nc.rr.com>
Cc: Linux-8086 <linux-8086@vger.kernel.org>

Hi,

I cannot help you unfortunately But please let me know what happens I
am really interested!

Thanks,

Eric des Courtis

On 3/23/06, Jody <jbruchon@nc.rr.com> wrote:
> So basically, you've got segmentation in 256-byte increments instead of
> 16 in order to handle an additional four address lines, correct?
>
> That sounds like something that shouldn't be difficult to change, but I
> know nothing about how to do it.
>
> Jody
>
> Serdar Sutay wrote:
> > Dear All,
> >
> > I am porting ELKS to a special version of 80186 to be used in embedded
> > devices. This special version known as Turbo186 is using 24 bit
> > addressing using a special addressing scheme. So I need to modify bcc or
> > as86 to support 24 bit addressing mode.
> >
> > This type of operation is common in embedded usage. 24 bit addressing is
> > working like this,
> >
> > In normal 20 bit addressing when far jumps are used, two 16 bit operands
> > are given for address calculation. First operand is left shifted 4 bits
> > and added to second operand, then 20 bit address is calculated.
> >
> > In 24 bit addressing mode, first operand is left shifted 8 bits and
> > added to second operand, resulting in 24 bit address.
> >
> > What am I required to do to support 24 bits addressing in bcc? Can you
> > give me some insight or guide me to the correct person?
> >
> > Thank you for your consideration and help.
> >
> > Kindest regards,
> >
> > Serdar Sutay
> > -
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