Contained within the ecm is a removable calibration unit, on programmable read-only memory .
2.
In many industrial microcomputer applications, programs are held in read-only memory to ensure that the program is never accidentally changed or lost .
3.
Electrically erasable and programmable read - only memory e2prom
4.
Mask processing , programmable read - only memories
5.
Electrically erasable programmable read - only memory eeprom
