Hi Chris,
Here are some Asimov downloads that might have the info you need to find or make the cable you need:
ftp://public.asimov.net/pub/apple_II/documentation/hardware/misc/Apple%20II%20Family%20Pinouts.pdf
ftp://public.asimov.net/pub/apple_II/documentation/hardware/misc/Pinouts,%20Ports,%20and%20Cables.zip
ftp://public.asimov.net/pub/apple_II/documentation/hardware/misc/PINOUTS.TXT
ftp://public.asimov.net/pub/apple_II/documentation/apple3/Tech%20Info%20Library%20-%20Apple%20III%20Software%20and%20Hardware.zip
ftp://public.asimov.net/pub/apple_II/documentation/hardware/misc/Tech%20Info%20Library%20-%20Apple%20II%20Hardware.zip
ftp://public.asimov.net/pub/apple_II/documentation/misc/Tech%20Info%20Library%20-%20Apple%20II%20Software.zip
ftp://public.asimov.net/pub/apple_II/documentation/hardware/misc/Service%20Source%20-%20Apple%20Modems.pdf
ftp://public.asimov.net/pub/apple_II/documentation/hardware/misc/Service%20Source%20-%20Imagewriter%20II.pdf
ftp://public.asimov.net/pub/apple_II/documentation/hardware/printers/apple-imagewriter-ii-8703.pdf
ftp://public.asimov.net/pub/apple_II/documentation/hardware/printers/Apple%20ImageWriter%20II%20-%20Quick%20Reference%20Card.pdf
ftp://public.asimov.net/pub/apple_II/documentation/hardware/printers/Apple%20ImageWriter%20II%20Owner's%20Manual.pdf
ftp://public.asimov.net/pub/apple_II/documentation/hardware/printers/Apple%20ImageWriter%20II%20Technical%20Reference%20Manual.pdf
ftp://public.asimov.net/pub/apple_II/documentation/hardware/printers/Apple%20Imagewriter%20II.pdf
ftp://public.asimov.net/pub/apple_II/documentation/hardware/printers/Apple%20Technical%20Procedures%20-%20ImageWriter%20II.pdf
ftp://public.asimov.net/pub/apple_II/documentation/hardware/printers/apple_imagewriter_ii.pdf
ftp://public.asimov.net/pub/apple_II/documentation/hardware/printers/apple_imagewriter_ii_special_installation_instructions.pdf
ftp://public.asimov.net/pub/apple_II/documentation/hardware/printers/ImageWriter%20II_SheetFeeder%20Installation%20Manual.pdf
ftp://public.asimov.net/pub/apple_II/documentation/hardware/printers/Sams%20Technical%20-%20Imagewriter%20II.pdf
ftp://public.asimov.net/pub/apple_II/documentation/hardware/schematics/AppleSchematics%20-%20IMAGEWRITER.zip
ftp://public.asimov.net/pub/apple_II/documentation/misc/ImageWriter%20II%20Print%20Samples.pdf
ftp://public.asimov.net/pub/apple_II/images/non-english/french/apple/apple_toolkitimagewriter_disks.zip
ftp://public.asimov.net/pub/apple_II/images/productivity/graphics/misc/Apple%20ImageWriter%20tool%20kit%201.5%20on%20800k%20image.2mg
ftp://public.asimov.net/pub/apple_II/images/productivity/graphics/misc/Apple%20Imagewriter%20Toolkit%20v1.0.dsk
ftp://public.asimov.net/pub/apple_II/images/productivity/graphics/misc/Apple%20ImageWriter%20Toolkit%20v1.0A.dsk
ftp://public.asimov.net/pub/apple_II/images/productivity/graphics/misc/APPLE_IMAGEWRITER_TOOLKIT_v1.5.dsk
ftp://public.asimov.net/pub/apple_II/documentation/hardware/io/super_serial_card
ftp://public.asimov.net/pub/apple_II/documentation/hardware/io/super_serial_card/a2_Super_Serial_Card_installation%20and%20operating_Manual.pdf
ftp://public.asimov.net/pub/apple_II/documentation/hardware/io/super_serial_card/a2_Super_Serial_Card_user's_manual.pdf
ftp://public.asimov.net/pub/apple_II/documentation/hardware/io/super_serial_card/Apple%20II%20Super%20Serial%20Card%20-%20Box%202.JPG
ftp://public.asimov.net/pub/apple_II/documentation/hardware/io/super_serial_card/Apple%20II%20Super%20Serial%20Card%20-%20Box.jpg
ftp://public.asimov.net/pub/apple_II/documentation/hardware/io/super_serial_card/Apple%20II%20Super%20Serial%20Card%20-%20Errata.pdf
ftp://public.asimov.net/pub/apple_II/documentation/hardware/io/super_serial_card/Apple%20II%20Super%20Serial%20Card%20-%20Front.jpg
ftp://public.asimov.net/pub/apple_II/documentation/hardware/io/super_serial_card/Apple%20II%20Super%20Serial%20Card%20-%20Installation%20and%20Operating%20Manual%201981.pdf
ftp://public.asimov.net/pub/apple_II/documentation/hardware/io/super_serial_card/Apple%20II%20Super%20Serial%20Card%20-%20Reference%20Card.pdf
ftp://public.asimov.net/pub/apple_II/documentation/hardware/io/super_serial_card/Apple%20II%20Super%20Serial%20Card%20-%20Schematics%20050-0045-A.pdf
ftp://public.asimov.net/pub/apple_II/documentation/hardware/io/super_serial_card/Apple%20II%20Super%20Serial%20Card%20-%20User's%20Manual%201985.pdf
ftp://public.asimov.net/pub/apple_II/documentation/hardware/io/super_serial_card/Apple%20II%20Super%20Serial%20Card%20User's%20Manual.pdf
ftp://public.asimov.net/pub/apple_II/documentation/hardware/io/super_serial_card/Apple%20Super%20Serial%20Card%20Dip%20Switch%20Settings%20Sticker.pdf
ftp://public.asimov.net/pub/apple_II/documentation/hardware/io/super_serial_card/Apple%20Super%20Serial%20Card%20Manual%20Complete.pdf
ftp://public.asimov.net/pub/apple_II/documentation/hardware/io/super_serial_card/Apple%20Super%20Serial%20Card%20Reference%20Card.pdf
ftp://public.asimov.net/pub/apple_II/documentation/hardware/io/super_serial_card/apple_ii_super_serial_card_-_reference_card.pdf
ftp://public.asimov.net/pub/apple_II/documentation/hardware/io/super_serial_card/super-serial-card-packing-list.pdf
ftp://public.asimov.net/pub/apple_II/emulators/rom_images/Apple%20II%20Super%20Serial%20Card%20ROM%20-%20341-0065-A.bin
ftp://public.asimov.net/pub/apple_II/documentation/hardware/schematics/super_serial_card_050-0045-a_schematic.pdf
Hope this helps,
James Davis