User`s guide

The header is as viewed on the motherboard. The DB-15 is the female connector
that you would plug the keypad into.
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From: Rubywand
012- Is there some cable or card which lets a II user
connect two joysticks?
Yes. One is Paddle-Adapple from Southern California Research Group. It is a
small external card with sockets for the joysticks. A ribbon cable runs into
the Apple II and plugs into the 16-pin Game socket.
As noted in the "for Apple II, //e, & Franklin" model's data sheet, Paddle-
Adapple lets you switch between two sticks; or, with the switch set to "A" plus
proper jumper settings, you can access two two-button sticks. The jumpers also
allow programming the card for different X-Y and button configurations.
______________________________
From: Oliver Schmidt and Guillaume Tello
013- How do I write programs for the Apple Graphics
Tablet?
The Apple Graphics Tablet I know of is rather large and heavy; its pen is
attached to it with a (too short) cable; it makes funny sounds that change when
the pen is moved in/out the reach of of the tablet.
A long time ago I patched a few programs to make use of this tablet. To
make it clear in the first place - I don't have these patched versions available
anymore :-(. But I found a listing from which I can tell you this:
To detect the interface card, I looped over all slots to check in its
firmware for
$B0 at location $Cx01 and
$20 at location $Cx09
x being the slot number. I never found this 'signature' in any other firmware.
To check for the pen position one has to poll the tablet (again x being the
slot number):
LDA $CFFF ; switch off all extension ROMS
LDA $Cx00 ; switch on the extension ROM of the tablet
LDA #$Cx
STA $07F8 ; initialize some hidden text screen data area for the tablet firmware
JSR $CBB9 ; call well known location ;-) in tablet firmware