[Coco] 6309

[Zippster]

That is my understanding too.  Illegal 6809 opcodes were triggering the
error trapping, and without that being handled…  crash.

Error trapping is active for both emulation and native mode.

- Ed


> On Mar 27, 2017, at 11:43 AM, Arthur Flexser <flexser at fiu.edu> wrote:
> 
> 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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