[Coco] Update: os9gen on 128k coco3, rs323 pack
snhirsch at gmail.com
Sun Feb 15 15:04:16 EST 2009
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
>> the 4 pullup r's tied to each card socket pin 8, and then jumper all
>> 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.
> 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).
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