[Coco] 6309

[Arthur Flexser]

Bill, I think the error trapping that you're describing is what happens in
emulation (or native) mode when an illegal opcode (i.e., illegal even when
6309 added opcodes are included) is encountered.  According to others, a
legal 6309 instruction is executed even in emulation mode.

Art

On Mon, Mar 27, 2017 at 12:30 PM, Bill Nobel <b_nobel at hotmail.com> wrote:

> What actually happens, is the 6309 will see that it is emulation mode and
> cause a error trap.  The CPU will grab the address stored @ $FFF0 & $FFF1
> and jump to it.  This was how the new instructions were discovered.  Users
> of the 6309 thought it was a flaky 6809 clone because it would randomly
> crash on a error.
>
> Bill Nobel
> b_nobel at hotmail.com<mailto:b_nobel at hotmail.com>
>
>
>
> On Mar 27, 2017, at 10:04 AM, Arthur Flexser <flexser at fiu.edu<mailto:
> flexser at fiu.edu>> wrote:
>
> BTW, what happens if you're in emulation (non-native) mode and a
> 6309-specific instruction is encountered.  Is it executed, error-trapped,
> or what?
>
> Art
>
> On Mon, Mar 27, 2017 at 10:54 AM, L. Curtis Boyle <curtisboyle at sasktel.net
> <mailto:curtisboyle at sasktel.net>>
> wrote:
>
> Just to clarify - you see around a 10% speed increase just by turning
> native mode on. You can see a much bigger increase for code written
> specifically for the new registers, new instructions, block memory moves,
> etc. (like the 6309 version of NitrOS-9).
>
> L. Curtis Boyle
> curtisboyle at sasktel.net<mailto:curtisboyle at sasktel.net>
>
>
>
> On Mar 26, 2017, at 11:06 PM, Dave Philipsen <dave at davebiz.com> wrote:
>
> The HD63C09E is a microprocessor made by Hitachi that is pin-compatible
> with the MC68B09E from Motorola (which is what your CoCo originally comes
> with).  It is basically 100% compatible (with some pretty unremarkable
> exceptions) with the 6809 but it also has a 'native mode' that can be
> entered where it has improved performance.  The native mode also adds some
> more registers and instructions.  Generally, the 6309 runs somewhere around
> 10% faster than the 6809 and, if you take advantage of some of its
> additional instructions it may even perform better than that.
>
> There is a re-write of the OS9 operating system called NitrOS9 that
> supports the native mode of the 6309 and gives you some performance
> improvement although there is a version of NitrOS9 for the plain vanilla
> 6809 too.  Given the fact that neither the 6809 nor the 6309 are being
> actively produced anymore, a person may want to obtain a few just in case
> he blows one up or something happens.  You should have enough of them to
> last you through the rest of your lifetime or the expectancy that you will
> be involved as a hobbyist with the CoCo or 6809/6309!
>
> Dave
>
>
> On 3/26/2017 11:50 PM, Steve C. wrote:
> For those of us not maintaining the previous emails, what is the 6309,
> why
> do we want one or three of 'em, how much will they be if you reach 100,
> and
> do they come with sockets? Oh, and before I hit send, are they
> compatible
> with everything 6809? Oh, yes, and most importantly... dang I hit send.
>
> On Sun, Mar 26, 2017 at 8:31 PM, camillus gmail <
> camillus.b.58 at gmail.com>
> wrote:
>
> Hi all,
>
> As of this moment 3/26/2017 10:30 PM we have 74 count.
> 26 to go and knock off a dollar/piece....LOL
>
>
> cb
>
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