Hi,
ard(a)p850ug1.demon.co.uk (Tony Duell) said:
A little OT
but certainly related: I had a 'camera' made by MicroMint
(Steve Ciarcia) made to work with an Apple ][. It was basically a
photo-eraseable EPROM and an adapter card for the Apple.
I thought it was actually a DRAM chip with a transparent top (the number
'IS32 Optic RAM' is sort-of in my mind, but I can't be sure). Light
falling on the storage capacitors causes them to discharge faster. You
fill the RAM with 1s, wait a little bit, and read it out. The cells that
read as 0s have had a lot of light falling on them. Then fill the RAM
with 1s again, wait a bit longer. The extra cells that read out as 0s
have had some, but less, light falling on them. Repeat for 8 or so times
(to get 3 bits/pixel).
I remember reading about that being done for an astronomical telescope
camera - in the early '80s I think.
--
Cheers,
Stan Barr stanb(a)dial.pipex.com
The future was never like this!