BLU on a 2/10: RX but no TX?

Is there any good reason why BLU should fail to transmit data from Port B of a 2/10, even while data reception is fine (or so the terminal test screen would indicate)?

I have made a cable to spec (as described in the BLU manual) and verified with an ohmmeter that the pins are hooked up correctly. I've tried with two separate computers with the same results, and even with some other old cables I have lying around.

This 2/10 once had a life as a Macintosh XL, but in the intervening years a 400K drive was swapped back in place of the 800k drive, along with the corresponding I/O board ROM. I don't know if that's relevant, but I suppose there's a chance that the backwards reversion to a Lisa was not complete, and modifications to the serial port intended to support e.g. LocalTalk are still in place. I happen to know that this computer was once used with a Farallon PhoneNet adapter (with a DB25 male plug, even!).

Although I haven't gotten that far yet: will BLU back up ProFiles attached to a parallel port card?

Many thanks,
--Tom

-- 
-- 
-----
You received this message because you are a member of the LisaList group.
The group FAQ is at http://lowendmac.com/lists/lisa.html
To post to this group, send email to lisalist_at_email.domain.hidden
To leave this group, send email to lisalist+unsubscribe_at_email.domain.hidden
For more options, visit this group at http://groups.google.com/group/lisalist
--- 
You received this message because you are subscribed to the Google Groups "LisaList" group.
To unsubscribe from this group and stop receiving emails from it, send an email to lisalist+unsubscribe_at_googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.



text/html attachment: alternate version of message