2 Oct
2007
2 Oct
'07
6:31 p.m.
Subject: EPROM Death?
From: "Zane H. Healy" <healyzh at aracnet.com>
Date: Tue, 02 Oct 2007 17:33:11 -0700
To: classiccmp at classiccmp.org
How do you tell an over-erased EPROM?
I finally have my programmer and eraser, and just tried erasing 6
EPROM's. Four erased just fine, and two are showing weird patterns
of alternating blocks of 04/06 and 14/16.
Zane
I've seen that when the quartz window isn't really clean and the
UV hasn't quite done the full job. I have found some vendors
eproms need a little more time to cook.
Ove 26 years I think I've only seen one that really had a stuck
bit and that was a blown output pin.
Allison