4 Commits

Author	SHA1	Message	Date
Greg King	078a1df2f6	Look for NULL pointer more efficiently.	2013-07-05 12:32:19 -04:00
Greg King	e63bf1cde1	Used a library-reference method to calibrate lightpen drivers. ... The mouse reference is a pointer. If it's NULL, the driver uses a default. If it's non-NULL, then it points to a function that the driver can call. That function will adjust the driver's calibration value. It could ask the user to adjust the pen; or, it could read a file that holds a value from a previous calibration. Application writers can choose how it's done: a function that's provided by the library, a custom function, or nothing.	2013-06-23 03:18:28 -04:00
Greg King	66ca781bb1	Added library reference address to lightpen driver header.	2013-06-03 06:09:22 -04:00
Greg King	051c21726b	Added Inkwell lightpen drivers for the C64 and the C128. ... They use the mouse driver programming interface. Added a test program for lightpen drivers. Now, it knows about only those two drivers; it will need updating when others are added.	2013-05-29 20:02:29 -04:00