CompuServe Messages

I had the opportunity to borrow an emm card, and I discovered the same thing (no 2nd serial port). I'm pretty sure it's due to the fact that the serial port IRQ's and I/O port addresses are used in a non-standard way… notice that when the bridge boots and reports on # of serial & parallel ports the address given to LPT1 is listed as $278, which is really the address for LPT3. The really wierd thing is that although COM1 is listed at $3F8, running ATITEST or similar equipment test routines report a serial port at $2F8, which is COM2's address. I think the problem is that CBM planned to do serial port emulation and abandoned it without restoring things to normal. If this is the case, there may be a software fixfor this. If it's that they needed an IRQ for something else, they should have used IRQ2, which is generally unused in an XT. Sure wish CBM would post a listing of any I/O addresses, etc they are using!