On 6/14/2013 10:06 AM, David Schmenk wrote:
IvanX- maybe the other DaveX will chime in, but I believe ADTPro only works with the modem port on the //c. There is no way to select multiple serial cards in ADTPro, so I'm guessing it uses first one it finds when scanning down from slot 7. Aside from some differences in interrupt connections and firmware, the 6551's are wired the same. You can check out how the interrupts may affect how the serial ports operate by looking at the //c tech ref man.
Other DaveX here - I was going to keep out of it, because you guys were having a fine time all on your own. But if you want pedantic details, I'm your man...
While it's true that ADTPro will detect and favor "slot" 2 on the IIc, that doesn't keep you from choosing slot 1. And it'll poke at it as if it is an SSC, so it should work. Ric mentions changing slot defaults using the System Utilities - that may indeed help. There are a couple of physical mode switches on the SSC that are advantageous to throw that I *think* don't have virtual equivalents - the one(s) controlling printer-ness (Ctrl-I) vs. modem-ness (Ctrl-A).
The GS positively can not use the printer port. It would be trivial to add, and I can control printer-ness vs. modem-ness via programmatic SCC (no, that's not a typo) port setup. But there's approximately no one who would want that - and it only offers one more chance for users to screw something up in the already persnickety world of serial communications.
Which brings me to an idea I've been kicking around lately... I think I'll be removing the ability to change baud rates. There should be no reason to ever go below top speed. I've yet to see a case where slowing down ever actually helped a situation. If you can't run at top speed, something else is wrong. And allowing users to change them simply adds yet another thing that can become mismatched and impede communications (which tends to generate more email for me).