[Coco] Update: os9gen on 128k coco3, rs323 pack

[Gene Heskett]

On Sunday 15 February 2009, Steven Hirsch wrote:
>On Sun, 15 Feb 2009, Steven Hirsch wrote:
>> On Sun, 15 Feb 2009, Gene Heskett wrote:
>>> On Sunday 15 February 2009, Steven Hirsch wrote:
>>>> On Sun, 15 Feb 2009, Michael Furman wrote:
>>>>> I tried using the rs232 pak ROM and it seems to hang occasionally.
>>>>
>>>> There's an obscure problem with interrupt handling that might be behind
>>>> the hangs.  I have no personal experience with it, but it's written up
>>>> in "Tandy's Little Wonder" (Farna Systems?).  IIRC, interrupts are not
>>>> properly shared between the cartridge slot and the GIME with the end
>>>> result being that SIO interrupts can be lost.  Again, just speculation
>>>> that this is the issue!
>>>
>>> There is about a 100/1 chance that is correct.  The fix is to remove
>>> three of
>>> the 4 pullup r's tied to each card socket pin 8, and then jumper all
>>> sockets
>>> pin 8's together.  This allows the IRQ to get through to the coco and be
>>> serviced regardless of where the slot switch is, or what slot was last
>>> selected by the software.
>>
>> Gene,
>>
>> I don't think he's using an MPI.  The problem I'm referring to is internal
>> to the computer and has to do with how the cart interrupt is routed to the
>> CPU.
>
><groan>..  Sorry, getting the threads mixed up.  Mike _is_ apparantly
>using an MPI, but one without the logic update for the CoCo 3 (according
>to an earlier post).
>
>Steve

And that will bite.

-- 
Cheers, Gene
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