integrated circuits
An integrated circuit is a set of electronic circuits embedded on one small flat piece (or "chip") of semiconductor material, usually silicon.
https://en.wikipedia.org/wiki/Integrated_circuit#Types
ROM Memory ICs
Masked ROM
PROM
EPROM - Erasable Programmable Read Only Memory
EPROMs can be programmed and erased enabling them to be re-used. Erasure is accomplished using an UV (Ultra Violet) light source that shines through a quartz erasing window in the EPROM package.
EPROMs can be programmed and erased enabling them to be re-used. Erasure is accomplished using an UV (Ultra Violet) light source that shines through a quartz erasing window in the EPROM package.
One common class of EPROM are the 2700 series produced by many manufactures in the 80s and 90s and now available mainly on eBay. They are in use in a lot of vintage computers, game systems and cartridges. The number at the end of the EPROM code (usually) represents the number of kb available in the package. They come in Dual Inline Package (DIP) or Plastic Leaded Chip Carrier (PLCC) formats.
2716
16kb/16384b/2kB
24 DIP
2732
32kb/32768b/4kB
24 DIP
2764
64kb/65535b/8kB
28 or 32 DIP
27128
128kb/131072b/16kB
28 DIP or 32 PLCC
27256
256kb/262144b/32kB
28 DIP or 32 PLCC
27512
512kb/524288b/64kB
28 DIP or 32 PLCC
271024
1024kb/1048576b/128kB
40 DIP
272048
2048kb/2097152b/256kB
40 DIP
274096
4096kb/4194304b/512kB
40 DIP
There are lots of variants of these chips which vary in speed, programming voltage or memory technology used.

Generic 2764 EPROM Pinout
Read more about EPROMs
🌐
www.advin.com
🌐
www.cpushack.com
🌐
www.classic-computers.org.nz
🌐
hobbyroms.com
🌐
mcs.pet.ac.il
🌐
ist.uwaterloo.ca
EEPROM - Erase one byte at a time
Flash EPROM - Erase whole content at once
Last modified: January 30th, 2022