I finished arranging and soldering the wire wrap sockets to the board. I also wired up the VCC and GND buses. Here’s a photo of the latest version:
The bus bar running down the side is ground, and the one running across the top is VCC (+5v). I have mounted most of the discrete components. I also mounted almost all of the bypass capacitors (I still need one for the display, which is a complete circuit of its own).
My next step is to wire all the VCC and GND connections to every circuit on the board that needs them. Then I’ll plug in all the chips and see how the power looks.
Wire Map
I spent a significant amount of time creating a wire map in Excel. I had to translate the EEPROM chips and RAM from the original parts to the ones I substituted. I’ll post the final Excel sheet when I finish and test the circuit. That way, I won’t have to correct and re-upload the sheet (and there’s no chance someone will download the faulty sheet). I’m confident that I probably forgot a connection or made a mistake. I’ve been over it twice and found mistakes each time. Here’s a sample of what the sheet looks like:
I ordered several spools of 30 gauge wire for wire wrapping. I had initially planned to use all blue wire but changed my mind as I was doing the wire map. Most of the wire arrives tomorrow, and I should be able to do the red and black for VCC and GND.
After I complete the wire-up and testing for power, I’ll move on to the clock. I have to test the clock module and make sure the clock signal arrives at all the chips it should arrive at. Once I’m happy with that, then I’ll make plans for what to wire next. I’ll attempt to use different colors for the clock, data, and address lines. I even have enough colors to use something different for the control lines.
Of course, after the wiring is complete, the hard part starts. Troubleshooting.