Hello New here
I've posted a little about this in the facebook group, but I thought I'd join up here and start a thread which would leave a trail and place for constructive comment and discussion.
Super Serial Cards aren't actually that common in the UK/Europe, whilst they are about 10-a-penny over in the US. Shipping them over here is the killer. With that in mind, as a new Apple IIe owner without an SSC I started looking at the possibility of rebuilding the thing at a price that would be less than what you'd pay to have them shipped over.
I've got as far as laying out the schematic and most of the PCB in KiCAD, but some discussion on facebook got me thinking further.
Firstly, the 6551 isn't that available anymore, and WDC's final run of them is irrevocably broken. Secondly, something that worked reliably at modern speeds would potentially be attractive to people.
With that in mind, I've started to look at using an ARM microcontroller to emulate a SSC/6551, whilst also giving access to its own UARTs for very high speed communications. In addition it would seem to be very easy to pop on a GPIO header for a Raspberry Pi and get Apple2Pi plugged in too.
As a first step I've got some small breakout cards for the Apple II Bus on order, the design of which, along with gerbers is here: https://goo.gl/tSZMsV - it's completely open source, please feel free to share, make your own, derive, munge and do whatever with it. I will be doing exactly the same with the design/code for the full serial card.
Clearly something like this has a huge amount of capacity to do a huge amount more, so I'd be very interested in thoughts/ideas/input/whatever, basically!