HPBasic code for RS-232 on a 9826 with a 98626A card?

[cruff]

You probably have to configure it to ignore the modem control signals or jumper them so the laptop thinks it is ok to transmit. You might also need to disable flow control in the program you are using to access the serial port.

For example if using Kermit:
set flow-control none
set carrier-watch off