Archives TK-II Dual PS/2 Firmware
This firmware started out life with dual PS/2 keyboard capability baked in, and will work in all the older hardware shown below while supporting this feature. It will also work in some current designs. However it is considered depreciated, and will no longer be implemented in newer hardware designs to come. Also it's important to keep in mind that some of the newer boards absolutely require the 'J' version firmware and will not work correctly with anything else.
The last two updates corrected the following bugs...
The CTRL+SHIFT+Arrow keys combinations will now render the correct Atari key codes.
There will no longer be any interference with the stock Atari keyboard's CTRL, SHIFT, or BREAK keys if the XEGS mode has been toggled OFF (CTRL+ALT+X to toggle, ALT+X to view present setting).
Dual PS/2 Keyboard Firmware Download
Note For TK-II-PBJ or TK-II-Stereo Boards: After assembly and before plugging in the Pokey chip(s), be sure to program the on-board PIC chip via the board's ICSP header prior to installation in the Atari .
Archives TK-II Old Version Boards
Dual PS/2 Keyboard Diode Modification (prior to version 2)
Activates IRQ from 2nd PS/2 connector which was required on these older series boards to enable two keyboard operation.