Altair serial port update

All: Word to the wise -- always check the cabling. I've been wracking my brain this week on the serial port problems with my Altair. I wired the serial board cable per the manual but I never checked if it was NULL or not. Well, when I put a null adapter on the cable, it worked! Whoo, hoo. So with the board configured as an Altair Revision 1 SIO board (ports 0/1), I toggled in the standard tape loader set for 8k BASIC. I used Terra Term Pro to send the file at 1200 baud. I saw the data echoed to the screen but no joy. I never get the "MEMORY SIZE?" prompt, even after fiddling with the sense switches. I hate to be a pest, but is there something I'm missing? Rich Rich Cini Collector of classic computers Build Master for the Altair32 Emulation Project Web site: http://highgate.comm.sfu.ca/~rcini/classiccmp/ /************************************************************/