This is my (almost) a replica of the MK14 VDU Board. I have not exactly followed the original tracking though the layout is true and I have retained the original component references.
I've made a small number of electrical changes as follows:
the 74L86 (IC1) has been replaced by a 74LS86 (the two are not pin compatible)
the 80L95 (IC9 and 10) have been replaced with a 74LS365 (pin compatible - no change to PCB)
links have been added between the control lines and the bus connector
The main problem with this board though remains the availability of the DM8678CAB character generator, an alternative is my MK14E VDU which doesn't require this IC.
Schematic
Bill Of Materials
Expansion Connector
Blank PCB
