µPF--2 : Final Beta Version

By reworking the layout of the components, I finally had enough room to implement all of the extension connector signals. All I have to do now is to create the printed circuit board:

The final circuit is quite large in the end, given all the elements that are implemented.

Eventually, I hope to be able to operate these various original expansion boards knowing that they are intended for a µPF1P and not a µPF1 or 1B :

Printer & I/O boards.

Interesting informations on this subject are available on this site: https://fjkraan.home.xs4all.nl/comp/mpf1/

µPF--2 : Finally it should look like this!

As I mentioned in a previous post, it is not always easy to arbitrate between the capacities of a system and the difficulty of its material realization, especially if in addition the final price must be as tight as possible.

For this uPF--2 I considered several possibilities before arriving at a system which I believe to be sufficiently simple but efficient for the envisaged use.

Here in 3D what should look like the system :

Due to the FPGA used, I reduced the expansion bus to only addressing peripherals. This should be more than enough to create I / O expansion boards of all kinds.

This system takes all the characteristics of the original board of Wichit Schirichotte, but largely improved in terms of capacities and speed of execution.

http://www.kswichit.com/Z80/Z80.html

µPF--2 : Argh!!!

Studying an electronic board is, like many things, a matter of compromise. You have to make a choice between what you want to offer, the complexity of the schematic, and ultimately, the material feasibility.

The result of my previous study resulted in a fairly complex system. In fact, too complex for this type of subject. So I decided to deport all the FPGA part on a pre-fabricated board.

This brings as a result not only that the most delicate parts of the study are now on a circuit very easy to integrate, but in addition, offers a higher end FPGA. This still greatly simplifies the final board.

The result is now much simpler:

And voila! It should be easier to route now.