REDESIGN USING FPGA DAUGHTERBOARD FOR LOGIC
The original design used surface mount chips including multiple timers and combinatorial logic, matching as closely as feasible the circuit design of the IBM 5806223 card which implemented the controller function for the IBM 1627 plotter when connected to an IBM 1130 mainframe.
INSERTING COMPONENTS ON PRINTED CIRCUIT BOARD
PCBWAY sponsored the printed circuit card for this redesign, which I received recently and wrote about. I soldered on the daughtercard (Digilent CMOD S7 FPGA board) and one of the integrated circuit chips. As the remaining parts arrive and I have time, I will solder up the rest of the components on the PCB.
The most time consuming part of construction will be soldering down the contacts that will form the Solid Logic Technology (SLT technology of IBM mainframes from early 1960s) connectors. This card plugs into two SLT slots inside the IBM 1130 system. 3D printed covers finish off the connectors on the card, covering the contacts and guiding the mating of the card into the SLT socket.
Above you can see the current state of the new card on the left and the earlier version on the right with its connectors at the top. Pads on the new card are visible, onto which the metal contacts are soldered to create the connectors.
