[Coco] Interesting problem with multi-pak and CC3 and OS9L2 / Nitros9

John R. Hogerhuis jhoger at pobox.com
Fri Sep 30 21:53:58 EDT 2016

I had done a peek &hff90 and got 126. Which my understanding is that is an
upgraded mpi.

But that is very interesting bit of data. One I don't know if that's really
a good test. Two I got it off eBay and it's seria number is before it was
fixed but I didn't upgrade myself.

-- John.

On Friday, September 30, 2016, Robert Hermanek <rhermanek at centurytel.net>

> I know you mentioned you verified the PAL upgrade, but are you absolutely
> sure?  Only ask because what you describe sounds like what I ran into with
> coco3 and un-upgraded MPI (not os9, my own project).  I was writing a
> program that relied on interrupts to blink a cursor and collect keyboard
> input, and it worked great until I tried my multipak.  So then I upgraded
> it and problem was solved.
> Anyone remember what the quick test is for PAL/lousy MPI?
> -RobertH
> On 9/30/2016 2:54 PM, John R. Hogerhuis wrote:
>> I have an interesting problem with my multi-pak.
>> Back in 90s when I did most of my color computering I did not own a
>> multi-pak. At some point I bought one off ebay. I have already done the
>> PEEK to verify that it has the PAL upgrade. It seemed to work fine for
>> switching between rom paks.
>> Now that I have a CocoSDC I finally got around to doing some serious
>> testing and basically with multi-pak, the keyboard doesn't work under OS9.
>> My keyboard works fine under DECB. But if I boot into NitrOS9 or OS9L2
>> then
>> everything locks up at the prompt if I have my disk controller connected
>> through the Multi-Pak.
>> Also the cursor disappears.
>> This does not happen if I connect a disk controller directly to the Coco 3
>> and boot OS9 that way. Keyboard, cursor work fine in that case.
>> Now, if I boot OS9 with Multi-Pak in the loop and then power off the MPI
>> once everything is booted the cursor reappears and I can type (can't do
>> much though since the disk drive becomes inaccessible with the multi-pak
>> off).
>> So is the keyboard handled differently under OS-9? Is it somehow more
>> interrupt driven? And what could be happening with the Multi-Pak that
>> would
>> prevent the keyboard from being polled?
>> Thanks,
>> -- John.
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