24 Jan
2006
24 Jan
'06
1:38 p.m.
At 08:43 AM 1/24/06 -0500, you wrote:
Okay, I figured out the immediate problem. Three of the
pins on one
of the EPROMs have broken off. One was hanging by a thread and fell
off when I inspected it. I see no evidence that the pins remain in
the sockets so I guess they must have fallen off when I removed the
EPROMs to read them in my EPROM programmer. I suppose this suggests
that they may have fallen off *before* I read them and that is why
your SnapFORTH ROMs don't work. I don't think that's the case though
because I'm sure I would have noticed that. Do EPROM (or chip pins in
general) get more brittle as they get older?
They were plenty brittle to begin with! See for example the graph labeled
"Number of pins remaining vs number of socket insertions" in the WOM data
sheet:
http://academics.vmi.edu/ee_js/Research/IC_Datasheets/digital_cmos/Write%20…
Tim.