[Coco] Re: Coco printer primer...
random_rodder at yahoo.com
Thu Feb 16 11:28:05 EST 2006
Thanks for the offer of figuring the wiring for the cable. I may need to take you up on this, depending on how I've done below.
Yes, it does have a DB25 serial card. And the Okidata service manual states that is uses both X-ON/X-OFF and Ready/Busy protocols. I can only assume that it uses a standard RS232c connection as the manual does not have a pinout.
I'm guessing that when using the printer mode of the bit banger is send only and makes no use of the RS232's bi-directional capability.
Looking at the back of the Coco, here is how I see the connections (and PLEASE correct me if I am wrong):
Coco pins to DB25 pins
1 - not used
2 - /Printer Busy Still trying to figure this one out...
3 - Ground Pin 7 (assuming signal ground and not sheild)
4 - Data Pin 3 (Receive data on PC)
Now, where I will need some assistance at is determining if other pins need looped to each other...
Torsten Dittel <Torsten at Dittel.info> wrote: Look at the reply by Gene Heskett, he just corrected me the CoCo's Bit
Banger Port is doing +/-7.5V which matches perfectly the RS232 specs
(maybe I've been confused by some 68HC11 projects I did about 10 years
ago). So the only thing you need is a proper cable. Does your OKI's
serial card have a DB25 type connector? Someone on the list living in
the US might make you a cable easily ans send it to you if you don't
have soldering iron. If you need me to figure out the wiring of such a
cable I would do this too.
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