I share a variant of the SMBacker RTC design (http://www.smbaker.com/8-bit-isa-diskonchip-rtc-board):
Gerbers availables on OSHPark: https://oshpark.com/shared_projects/9vuRscy3
This design consists of a very low profile ISA card, which has the port 70h mapped as fixed. Soon Sergey's Micro8088 project will have support for it.
Now I offer this product through Tindie for whom you may be interested, kit or fully assembled:
https://www.tindie.com/products/spark2k06/rtc … ry-low-profile/
I have modified the micro8088 BIOS to make it compatible with it (version 0.9.7), and Sergey has optimized and improved the code. Until he decides to make it public in your GitHub repository, I leave it available in mine, as well as the instructions for its flashing:
https://github.com/spark2k06/micro_8088/tree/master/BIOS
However, this board can be used on any other PC with an ISA port and appropriate management software.
looks nice , kudos!
wrote:looks nice , kudos!
Thanks! 😀
New design removing discrete logic and replacing it with an SPLD:
I still have to check the connections and routing before ordering PCBs but I think that this way everything is much cleaner in a similar space. Both the DS12885 and the ATF16V8B will go in socket, and although I have the SPLD code ready for it to work on the standard RTC 70h port, it could be programmed by anyone to work on another port.
Once I have confirmed the correct working of the PCB, I will make the KiCad sources and gerbers public in my GitHub directory, apart from leaving them available for purchase both in kit and full assembled in my Tindie store.
Now available in Tindie, soon I will publish the gerbers, the Kicad project and the SPLD files.
https://www.tindie.com/products/spark2k06/rtc … w-profile-spld/
Kicad project, gerbers and SPLD files already available:
