[Coco] NitrOS9 driver for Tandy RS232 Pak?
robert.gault at worldnet.att.net
Mon Dec 29 10:50:51 EST 2008
Steven Hirsch wrote:
> On Mon, 29 Dec 2008, Gene Heskett wrote:
>> Silly me.. I had forgotten that I had un-merged an older boot disk
>> into that
>> tree because I wanted the descriptor for /t2.
>> The other messages you got that said sc6551.dr are the correct
>> drivers. They
>> are virtually identical, but renamed.
> After reviewing the chain of replies, I think I'm set. Just one issue
> remains, though:
> Only one resondant mentioned the need to remove the EPROM from the
> Program Pak. I'd rather not damage the label to extract the case screw
> unless absolutely necessary. Can anyone confirm that removal of the
> internal EPROM is, in fact, a requirement under NitrOS9?
It shouldn't be necessary but you can always try it with the ROM and see
what happens. I removed the ROM from my pak because I wanted to place a
SmartWatch in place of it and needed the room.
There are other reasons for wanting to open the pak. There are jumpers
inside the pak that tie the E clock to the CART* line and the IRQ* to
the NMI*. Neither of these is desirable if the pak is to be used without
For best results using interrupts, the IRQ* should be tied to the CART*
with a 4.7Kohm resistor on jumper E2 to +5v.
In my pak, the 5 to 12 v unit blew, so I had to remove it and add a line
to the port 12v connector.
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