Schnedler Systems Quad Parallel Port Interfaces

[airship]

I just received THREE of the above boards from an eBay purchase. I don't suppose anyone has any docs, do you? (Note that these are not Centronics parallel printer interfaces, but dual 6522-driven quad parallel port cards.)

If nobody comes forward, I would be glad to donate one of these to any of you hardware gurus who could draw a schematic* and take an educated guess as to how to use them.

*schematic actually optional

Thanks.

[BigDumbDinosaur]

To what are they designed to connect?

[Hydrophilic]

Good question BDD!  The Commodore side looks like it goes in the expansion/cartridge port, but the other side?

Airship, since you seem to be trying new hardware interfaces, can I assume you did not have much success with the I2C board you posted about earlier this year?  I was hoping you got that figured out enought to interface the math processor you were talking about.

[airship]

These were used by Xerox in a research lab. Each board has two 6522 VIAs and logic chips to use each 6522 as two parallel ports. That makes each board a quad parallel interface. The main boards are standard off-the-shelf Schnedler Systems C64 items that do plug into the expansion port, while the daughter boards merely connect to the main board's DIP ports (with pass-thru) to a 50-pin (I believe) ribbon cable connector.

And H, I bought an I2C evaluation board off the eBays but haven't had much time to play with it.

[XmikeX]

These were used by Xerox in a research lab. Each board has two 6522 VIAs and logic chips to use each 6522 as two parallel ports. That makes each board a quad parallel interface.

This brings back memories of ye olde Interfacing Blue Book ..

.. Dual User ports (sort of) with CIA, on page 60, here : http://www.bombjack.org/commodore/books/pdf/Commodore_64_Interfacing_Blue_Book.zip

http://www.bombjack.org/commodore/   (Thanks again, DLH and DLH's contributors!)

XmX