4 ms·
Transistors! E.g. EPROM (memory type chip) is typically deleted by shining a uv light on the actual silicon die, through a uv transparent quartz window in the
by genericone 5y ago
Transistors!
E.g. EPROM (memory type chip) is typically deleted by shining a uv light on the actual silicon die, through a uv transparent quartz window in the final packaged chip.
edit: fixed EEPROM -> EPROM
- moltke 5y agoI read somewhere that some people used EPROMs and decaped Ram chips as digitizers for early computers.
- 01100011 5y agohttps://hackaday.com/2014/04/05/taking-pictures-with-a-dram-chip/ https://hackaday.com/2014/04/05/taking-pictures-with-a-dram-... Yeah I remember a friend of mine back around '90 wanted to try it out. I can't remember if it was using DRAM or EPROM memory though. I want to say it was called 'ramra' or 'ramera'.
- analognoise 5y agoThat's not an EEPROM. That's an EPROM. The first E in EEPROM is ELECTRONIC - i.e. you use a voltage (or a control word) to indicate that you would like to erase the device. Also, EPROMs are extremely vintage. They were replaced by EEPROMs - the first of which came out in 1977. That's an... extremely vintage example.
- genericone 5y agoFixed And thanks for the info, I don't have direct experience dealing with EPROM and I had conflated EEPROM and EPROM together in my mind, but a quick google search quickly reveals my inadequate knowledge, which has now been updated, even if only good enough for trivia.
- dragontamer 5y ago> Also, EPROMs are extremely vintage. They were replaced by EEPROMs - the first of which came out in 1977. That's an... extremely vintage example. IIRC, EPROMs were still cheaper than EEPROMs for many years. EPROMs probably were sold in commercial quantities well into the 80s, and maybe used in the 90s. EPROMs were erased by just throwing them into a UV-bin and blasting them with UV light. In contrast, EEPROMs needed transistors inside to handle the erasing cycle. Finally, EPROM's last stand was as a low-cost one-time-programmable ROM (aka: PROM). All you had to do was make the same chip except without the expensive "window" (that'd normally receive UV-light for erasure).
- babagabooj 5y agoTrue. I was there. So were you, I assume. The previous poster was most likely speculating.
- dragontamer 5y agoNah, I'm once removed. I had professors who were active during the time and gave me the rundown. I have touched EPROMs and all that good stuff, still part of the labs at my college and my professor liked talking about "the good ol days". But I've never in fact used them in any practical manner.
- analognoise 5y agoNo, I know they cost less for a while, but the 90's were 30 years ago. That's vintage, isn't it? In the 90's, stuff from the 60's was 'vintage'. By 2022... the 90's are vintage?
- AnimalMuppet 5y agoWe look back on the 60s with nostalgia. The 90s? Not so much. I think that colors our definition of what is "vintage".
- elevaet 5y agoThis might just be your perspective. No idea your age, but personally as someone who was a teen/young adult in the 90s participating in the emerging rave culture, the 90s are dripping with nostalgia. That being said, I have to agree that the word 'vintage' evokes the 50-70s more than the 90s. Maybe the word has just come to mean that era in the english language, just like 'olden days' tends to mean a pre/semi-industrialized era that's somewhat locked in time. Perhaps we're running out of words for the past and we simply call these eras by their decades now.
- lb1lf 5y agoStudying EE in the late nineties, I can remember coming across EPROM microcontrollers a few times, but definitely not in new projects. IIRC, students recently graduated when I was doing my freshman year had used them for projects in their freshman year, but not since - so they were probably commonplace until 1990 or so. At least in Trondheim, Norway.
- mywittyname 5y agoHence, why we "flash" certain components.