[Coco] 6309 microprocessor project 01-16-2004

[John Collyer]

I know I seen someone suggest that the coco (4?)
whatever should use a 32-bit program counter
and extend the registers all to 32-bit.  I think that
would be nice!  One of the main reasons I like the
coco (4?) whatever is because of the 6809 assembly
language.  I haven't found any other assembly language
that even comes close to being so nice as the 6809.

John Collyer

----- Original Message ----- 
From: "John Collyer" <johncollyer at zoominternet.net>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Saturday, January 17, 2004 8:14 AM
Subject: Re: [Coco] 6309 microprocessor project 01-16-2004


> Yea, your probably right about moving the 8k blocks
> of memory being to slow for OS-9 Level 2.  My
> first scheme did it the way you suggested but I
> did not like having to do the extra work inside
> of getbyte and putbyte of finding the 8K offset
> from the [byte at address].  All I had to do was
> shift the [byte at address] and I would have a
> 8K offset instead of a 64K offset, but as I
> said that will only permit the special opcodes
> to work on 8K boundaries.  That is sort of the
> way these worked in the original emulator anyway.
>
> John Collyer
>
> ----- Original Message ----- 
> From: "Roger Taylor" <rtaylor at bayou.com>
> To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
> Sent: Friday, January 16, 2004 11:42 PM
> Subject: Re: [Coco] 6309 microprocessor project 01-16-2004
>
>
> > At 05:26 PM 1/16/2004 -0600, you wrote:
> >
> > >For RAM access:
> > >
> > >64k CPU address= is naturally $0000-$FFFF
> > >task#= bit 0 of 65425, write only
> > >block# = int((64k CPU address) / 8192)
> > >offset= (64k CPU address) modulas 8192
> > >address= [(65448+task#*8)+block#*8192+offset
> >
> >
> > something happened to my example... the right bracket got deleted
somehow
> >
> > It should be:
> >
> > >address= [(65448+task#*8)+block#]*8192+offset
> >
> > the brackets mean "the 8-bit value at"
> >
> > So [65456] would mean the value at address 65456.
> >
> >
> > ----------
> > Roger Taylor
> >
> >
> >
> >
> > -- 
> > Coco mailing list
> > Coco at maltedmedia.com
> > http://five.pairlist.net/mailman/listinfo/coco
> >
>
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