Detailed documentation at URL given above.
(1) Calcomp DrawingBoard III digitizing tablet fails to initialize as xinput device at startup due to timeout error. From /var/log/Xorg.0.log:
(WW) Timeout while reading Calcomp tablet. No tablet connected ???
(EE) Unable to query/initialize CALCOMP hardware.
User fix in xf86Calcomp.c: At line 787, change "int retries = 5;" to "int retries = 100;"
(2) After fixing (1), "xinput list TABLET" retrieves "7616" from the driver as the tablet axis 1 limit instead of the correct number, "24000".
User found error (missing line of code) in xf86Calcomp.c. At line 608 change
priv->max_y = (int)buffer + ((int)buffer << 7);
priv->max_y = (int)buffer + ((int)buffer << 7)
(3) "xinput set-pointer TABLET" fails on calcomp tablet.
X Error of failed request: BadDevice, invalid or uninitialized input device
Major opcode of failed request: 146 (XInputExtension)
Minor opcode of failed request: 12 (X_ChangePointerDevice)
Serial number of failed request: 12
Current serial number in output stream: 12
Sorry, closing as WONTFIX. This driver is unmaintained and will not see further fixes.