[Coco] NitrOS9 driver for Tandy RS232 Pak?

[Robert Gault]

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?

> 

> Steve

> 

> 


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 
the ROM.

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.