28 Jan
2006
28 Jan
'06
5:19 p.m.
On 1/29/2006 at 12:47 AM Philip Pemberton wrote:
> From what I remember they were a normal DRAM chip
with a quartz lid to
> the package (it's been suggested you could take a cerdip 4116 or 4164,
> knock off the top and replkce it with a window).
I recall an early scanner that made no bones about doing just this. From
what I recall, you charged the DRAM with ones or zeroes (don't recall
which), exposed it to light and read it looking for discharged cells. You
could do gray-scaling with several consecutive reads.
This was back in the days of 4116/4164 and IIRC, it mattered whose DRAMs
you used. Intels cells decayed pretty quickly, but the NEC parts would
easily hold a bit for a few seconds.
Cheers,
Chuck