From: Serdar Sutay <serdar.sutay@sentvion.com>
To: Linux-8086@Vger.Kernel.Org
Subject: BCC, ELKS 24 Bit addressing mode
Date: Thu, 23 Mar 2006 13:01:49 +0200 [thread overview]
Message-ID: <4422801D.2000006@sentvion.com> (raw)
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
next reply other threads:[~2006-03-23 11:01 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-23 11:01 Serdar Sutay [this message]
2006-03-23 18:56 ` BCC, ELKS 24 Bit addressing mode Segin
2006-03-23 18:22 ` Serdar Sutay
2006-03-24 5:11 ` Dan Olson
2006-03-24 5:17 ` Jody
2006-03-24 5:28 ` Dan Olson
2006-03-25 22:11 ` Gregg C Levine
2006-03-24 9:44 ` Andrey Romanenko
2006-03-23 19:53 ` Jody
2006-03-23 23:00 ` Eric des Courtis
2006-03-24 10:39 ` David Given
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