15 Commits

Author	SHA1	Message	Date
Dave	e415d43c84	Update addon board updates ... - Add diode to C5 to prevent discharge into 5V - allow selection of default ON or OFF soft switch.	2020-05-27 19:23:34 -05:00
Dave	42989dbd41	Update readme for clarity	2020-05-27 13:12:54 -05:00
Dave	4e40e324b6	Add image to README	2020-05-27 13:11:30 -05:00
Dave	35a39dda72	Add README.md to OSI interface	2020-05-27 13:10:28 -05:00
Dave	59f7eb9896	Completed routing on OSI interface board ... Cleaned up and fixed schematics	2020-05-27 12:22:58 -05:00
Dave	b5fa4f43bb	Fix comment in addon.sch	2020-05-21 16:00:06 -05:00
Dave	3c8a02ce9a	addon board uses 74HC14	2020-05-21 15:13:04 -05:00
Dave	1d2ccf8727	Update PCB to latest schematic	2020-05-21 13:51:19 -05:00
Dave	9482a3bf0e	Adjustments for OSI RESET and shiftlock circuits ... - adjust RC constants to use simple, common values and reduce number of different part values. - Create add-on PCB to provide reset/shiftlock function for older 542 and SB2 keyboards.	2020-05-21 13:48:38 -05:00
Dave	32e74986c5	More special keys and other circuit cleanup.	2020-04-27 17:16:08 -05:00
Dave	01f57f69e1	Circuit tweaks ... - Add power-on reset to reset circuit - Modify Shiftlock circuit to require only one jumper	2020-04-23 11:27:54 -05:00
Dave	0e70d49f44	Remove unused files	2020-04-21 14:37:25 -05:00
Dave	fe238606ff	Delete unused filenames	2020-04-21 14:36:44 -05:00
Dave	5fa0f80b4e	Add OSI interface schematic ... Provides a keyboard interface to interface with OSI computers. Equivalent to an OSI 542C. - Includes sound circuits - Includes RESET delay circuit - SHIFT LOCK can be mechanical push-on/push-off or soft toggle, selectable by jumper. - Provide SHIFT LOCK LED output.	2020-04-21 14:30:59 -05:00
Dave	784805adc7	first commit	2019-12-12 14:46:29 -06:00