Retrochallenge is well under way now and so it’s time I made a start and got something blogged about. Although my posts here don’t show a lot of activity, I do some work on one or other of my retro systems most weeks throughout the year but Retrochallenge is a good reminder to blog about some of this activity in the hope it may be useful to someone else or help to promote interest in our hobby.
A little while ago I tried to get a CF card adapter to work on my splendid little Interak-1. That didn’t work properly but an email conversation with a friend of mine who also has an Interak suggested that my cables were too long and that I needed to get the CF card as close to the CPU as possible.
So, my first Retrochallenge project this time around is to re-visit that project and try and get it to work.
In the previous attempt I used a CF card adapter intended for the RC2014 (itself a Retrochallenge project). In order to get that to talk to the Interak I needed to make a bus adapter and to do that I modified an Interak prototype board.
As I said above, the suspicion is that the CF card was too far away from the CPU.
Lets build a Mezzanine.
One way to get really close to the CPU is to slip a PCB between the CPU and its original socket and use this new PCB to link to the CF card adapter. This is the approach I’m using here.
Spencer Owen of RC2014 had a small number of prototype CPU cards in his Tindie store and bought one of those, soldered a wire-wrap socket to it, plugged that into a conventional socket and on into the socket my CPU originally sat in. (This is going on a bit, see the pictures).
Now the Z80 sits on the RC2014 CPU board and the Interak CPU board with the CF adapter over to the side.