[Coco] Back to the COCO

[Zippster]

Actually, the Tandy MPI is fully buffered on address lines, data, R/*W, even the clocks.
That said, this wouldn’t protect the CPU from a misalignment during insertion of the MPI itself.

Something plugging into the CPU socket like the Protector would be needed for that.

- Ed

 
> On Jan 4, 2017, at 10:02 AM, Brian Blake <random.rodder at gmail.com> wrote:
> 
> Bill,
> 
> I'm not sure I've ever seen a buffered 'y' cable before - it would only buffer the device being plugged into the CoCo anyhow. The best solution to protect the CoCo, IMHO, would be to install the Cloud9 Protector - CPU replacement board that has buffering IC's in place already.
> 
> 
> On 1/4/2017 10:35 AM, Bill Gunshannon wrote:
>> Funny you should mention that.  After seeing the comment about the COCO3 not having the 12v
>> required by the old floppy controller I got to wondering if it might not be better just running them
>> off of wall warts anyway.
>> 
>> If you could, send me a private email with your real mail address and I will see if I can dig up
>> boxes. (won't fit in even a large flat rate box! :-( )  Feel free to pull out any chips you suspect
>> and put in sockets.  I will gladly pay for the repairs as long as it doesn't end out exceeding
>> the actual cost of a new one.  :-)
>> 
>> And now another question for you or any of the other serious COCO hardware guys.
>> The MPI apparently has no more buffering than the cartridge port itself.  The Glenside
>> IDE has two open ports but also has no form of buffering either.  Just how hard would
>> it be to make something like the infamous Y-cable on a circuit board only with buffering
>> to protect the COCO from damage?  Getting PC boards is easy anymore with sites like
>> OSK (I have a handful of the cartridge boards and that is how I my Drivewire).  Is it
>> reasonable?
>> 
>> bill
>> ________________________________________
>> From: Coco [coco-bounces at maltedmedia.com] on behalf of camillus gmail [camillus.b.58 at gmail.com]
>> Sent: Wednesday, January 4, 2017 10:00 AM
>> To: Bill via Coco
>> Subject: Re: [Coco] Back to the COCO
>> 
>> Hi, Bill.
>> 
>> That sounds like a plan, and you may even take out the transformer of the broken one too. I power my coco's with a wall adapter, so I do not need the transformer.
>> 
>> I do need to tell you that the only way to tell if the cpu is dead is to take it out and replace it with a known good one. The fact that most of them are soldered directly to the board and removing them without harm is practically zero. I do have a couple of 6309 which are pin compatible and function the same. Those cpu's goes around for 8 to 12 $.
>> 
>> If the GIME is shot, then that is an other animal to slaughter. Those can only be replaced by existing chips from coco3's that are broke but still have a good GIME.
>> 
>> The pia's are still to find on the net.
>> 
>> So lets hope it is just a minor problem.
>> 
>> cb
>> 
>> On 1/4/2017 8:48:11 AM, Bill Gunshannon <bill.gunshannon at hotmail.com> wrote:
>> On 1/3/17 10:40 PM, camillus gmail wrote:
>>> HI Bill.
>>> 
>>> I would love to look at them, the only cost would be the shipping to indiana.
>>> 
>>> I have two coco3 working, so I can swap out part to test.
>>> 
>>> This is my hobby and I do not charge for this.
>>> 
>>> Unless of course you consider to let me keep one of the coco's for the keyboard and the case?
>>> 
>>> Let me know ho this sound for you
>> OK. let's try this....
>> 
>> How about if I send you one complete broken COCO3 that would be yours
>> to keep and include in the package two additional broken COCO3 circuit
>> boards for repair (assuming reasonable in both cost and needed work)
>> and return? Not shipping the two additional cases (and the
>> transformer) would reduce the cost. Doable?
>> 
>> bill
>> 
>> 
>> 
>> 
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