See all articles from SyncWare News v4 n3
The “One-chip NVM” in SWN 4:1 shows a minor discrepancy between the schematic (Fig. 3) and the pictorials and instructions. To agree with the wiring instructions, the base of the transistor should go to A13 and to the 6264’s CS2. The emitter should go to ROMCS NOT (only). The collector connection is correct.
Both variants work properly, and it’s debatable which is better. If you follow the instructions, your NVM will duplicate the author’s. I tried it with the alternate connection (per Fig. 3), with perfect results. -fn