Re: BCC, ELKS 24 Bit addressing mode

[Jody <jbruchon@nc.rr.com>]

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
> -
> To unsubscribe from this list: send the line "unsubscribe linux-8086" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>