Date: 09/08/2024
Quick Links:
7702 Manual
In early 2024, I started to accuire STD bus cards. I need to buy some memory cards but the cost of them were not worth it in my opinion so I decided to make one of my own.
Here are some images of the board.
Originital Schematic
Kicad Schematic
Construction of the memory card was used with the metyhod of wire wrapping and some soldering. An prototyping method that was common during the 1970-1980s. The only difference from the card that I made and from the prolog card is the jumper blocks for the Address 15, 14, and External Memory are in the form of a dip switch. The other difference is that there is no jumper block for the two banks of memory chips to be either RAM or ROM. I just made both memory banks to be RAM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
|---|---|---|---|---|---|---|---|---|
| X | 0 | 0 | X | 0 | X | 0 | X | 0 |
| A14 | !A14 | A15 | !A15 | GND | MEMEX | !MEMEX | !SEG | SEG |
TO-DO:
- Create PCB of the memory card