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.
- This allows the PCB to sink below the mounting brackets. The aligner height can
be adjusted relative to the mounting brackets using spacers.
- changed futaba aligners to use cherry stabilizers.
- bumped rev number
For better matching of current limit resistors to LEDs, the resistors are moved
to the keyboard matrix PCB, where they can be tuned for maximum brightness (at
100% duty cycle). This allows consistent keyboard brightness when a single
interface PCB is swapped between keyboard matrices.
- Fixed position offset error in first three rows of the SOL keyboard
- moved key matrix interface connector to bottom of board so the parallel output
connector can be at the top of the keyboard.
- Adjusted size of mounting slots to accommodate #6 screws.
- ongoing clean up of traces.
This allows the keymap to determine which LED is used, rather than requiring the
decision to be hardwired in at the time of assembly. For the OSI keyboard, the
LED could be placed on the SHIFTLOCK key, at the far right LED, or in the
CAPSLOCK position, which is just to the left of the RETURN and not otherwise
populated in the OSI layout.
- swap numbering of row select protection diodes for cleaner PCB labeling
- clarify labeling on GPIO pins on the MCU
- bump rev to 2.4 to indicate work in progress. Release will be 2.5.
- pulled in the right border and mounting holes for Apple-II mounting dimensions
- modified the "~^" key courtyard to allow closer positioning of the upper right
Apple II Mounting hole. (The ~^ key is not installed in an Apple II keyboard)
- Moved tracks and diodes as needed to keep everything in the new outline.
- Add extra key to the left side of row 4 to permit "inverted T" for those who
want it.
- Tiny shifts of several keys to correct key distances
- Include mounting holes with daughter board connector, to ensure consistency.
- Fix wrong direction DIP switch diodes
- Add buffers to permit ISP lines to also be used as output and LED drivers
- Allow 3 keyboard LEDs and 3 host outputs (RESET, CLEAR, BREAK, LOCAL, etc.).
- Outputs 1 and 3 are general purpose (can be open drain or driven). Output 2
is open collector (with optional on-board pullup).
- Add apple 2 mounting slots (and stretch PCB to accommodate slots
- Add pass-through holes in aligners for OSI keyboard spacers
- Move 'ESC' key next to '1' key
- Add TAB key next to Q key
- remove 'here is' and finalize "helper" keys along left side of keyboard
- move legends off of PCB traces
- update to release 1.3
The "0" and "O" keys were swapped on the PCB, requiring a keymap fix for the
ASCII adapter. The swapped keys would not be an issue for a keyscanning ASCII
converter, but would preclude use in OSI systems, so this fix puts the keys
back in position compatible with OSI.
- Add OSI-compatible mounting holes.
- Adjust keyboard and aligner holes to make room for the OSI mounting holes
- Change "Universal Keyboard" to "Unified Keyboard" in the design files.
