So this will be a thru-hole based Dual Pokey board that incorporates a U-Switch type function and a Dual PS/2 Keyboard based on the TransKey-II (TK-II) hardware/firmware. It'll be pretty close to the same size as Lotharek's Stereo Board, except all the connectors will be on the lower end of the board close to the original Pokey chip, as opposed to the upper end like on Lotharek's board. This will allow better clearance in an XEGS, where the cartridge port resides.
This is fully compatible with the U1MB BIOS Stereo detection and enable/disable via the U1MB /MO port.
Here is the tested circuit...
All of the parts get soldered in place, thus the need for the ICSP PIC programming port connections on J2. Most all of the components, other than connectors J1-J3 will reside inside the footprint of the two 40 pin Pokey sockets, and need to be of a low profile so as to allow the Pokey chips to be fully seated.
This design specification has now been locked in and tested on real hardware. So the next job will be to lay out a PCB, and then have a few sample boards made for final testing.
I will not be selling these boards, but just like the other TK-II boards I previously designed, they will be uploaded to OSH Park for purchasing by anyone who is interested. This is a DIY project, but hopefully someone will step up to make boards for those that do not possess the necessary skills to do so.
Time line for this project is approximately one month, with boards being available on OSH Park soon after.
Latest Firmware Download is available here: ataribits.weebly.com/design
This should be a nice addition to the Stereo Board collection