[Coco] CoCo DECB error list and descriptions

[Lee]

Well, then maybe my attempt to do something simple backfired.  I'm just
beginning to try to re-teach myself 6809 assembly (I knew it 35 years
ago).  Is it possible to return back to DECB from ML that you EXEC from
DECB (this is purely educational)? The "?FE ERROR" was a result of a truly
rooky mistake, I left off a PULS A at the end.  But fixing that just caused
it crash hard.  I was trying to see if I could just RTS at the end, but
that caused it to crash and lock.  I'm guessing maybe EXEC doesn't push a
return address that will cleanly return to DECB?  Maybe there some DECB
routine I need to JMP to at the end?

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On Tue, Feb 13, 2018 at 11:41 PM, William Astle <lost at l-w.ca> wrote:

> As Art said, there's no such thing as an ?FE error in standard DECB.
>
> It is, however, possible for a ML program to add additional errors if it
> wants to and that could be what happened here.
>
> However, it's more likely an incorrect error code went into the AC46 error
> handler. That routine expects an *even* number code in B. An odd number in
> B could give interesting results. In fact, the code 73 would cause "?FE"
> error to be shown since it would take the second character from "VF" and
> the first character from "ER", thus giving "FE". (Error number 36.5 in the
> reckoning used by ERNO if ERNO could handle fractional error codes.)
>
> On 2018-02-13 07:23 PM, Lee wrote:
>
>> Is there a list of DECB error codes ("?FE ERROR") and what they mean
>> anywhere online?  I just got an "?FE ERROR" (EXEC'ing some ML code I was
>> playing with from DECB) and can't find anything online explaining it (at
>> least what "FE" might stand for).  Faulty Exec?  Frackin' Excited?
>> Foobar'd Excellently? :)
>>
>> Lee
>>
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>>
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-- 
Lee Perkins
TigerBase Technologies
leep at tigerbase.com
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