Real Time Clock for PCXT and compatibles.Designed by spark2k06 in Spain
It is a project based on the SMBacker RTC but without Disk On Chip memory and a very low profile, which has the port mapped with these order options: 240h, 2A0h, 340h, 70h or other defined by the b...Read More…
It is a project based on the SMBacker RTC but without Disk On Chip memory and a very low profile, which has the port mapped with these order options:
240h, 2A0h, 340h, 70h or other defined by the buyer.
The visible part after being inserted in the ISA slot is little more than the size of a 3V CR2032 battery as can be seen in the last photograph.
It differs from the my first version (now retired from Tindie) by replacing all discrete logic with an SPF ATF16V8B, including the configuration of the port, thanks to which it could be reconfigured because the SPLD IC is into socket.
Sergey's micro8088 project lacks RTC unlike the other xi8088 project also designed by him. For this reason I decided to redesign the existing SMBacker project, removing the part of Disk On Chip that I consider unnecessary, and reducing the size of the board as much as possible.
The small size is a differentiating element in this project, while maintaining the ease of welding in this second version when using throuth hole technology.
Also gold fingers contacts for greater signal reliability and board durability.
I have modified the micro8088 BIOS to make it compatible with it (version 0.9.7) on 70h port, 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:
If your PC BIOS does not have support for RTC, you must use its management software, there are already several solutions for this purpose.
As options available I have also decided to offer only the PCB without components, apart from Kit and Full Assembled. If only PCB is chosen, I will provide the buyer with the corresponding binary for the SPLD, configured in the port you choose... in the other options it will already be flasshed.
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Correos: Airpost (No tracking code)
Shipping service is untracked. Delivery times of up to 4 weeks can be expected.
Correos: Paq Light
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