Strange EPROM Adapter Found

[Bryan Villados <news001@macgeek.org>]

Hi, guys!

Digging in my old computer junk, I came across something I'm curious
about... My dad (he passed away a while back) used to tinker with
EPROMs, and he used to burn them all the time. I found an adapter he
made... It's a 24-pin adapter (Textool) and he left in it a 2716 EPROM.
I believe he made it so that he could stick this adapter into an
existing ROM port (on an Apple II logic board, card, etc.) then pop an
EPROM into it.

Here's the thing I'm curious about... On the adapter he jumpered pins
21 and 24, and pins 18 and 20. What's the purpose of doing this????

---
Bryan Villados
Curator, Apple Museum For-a-Day, Hawaii
http://www.macgeek.org/