MCU Library.MCU · r1.1 · 30 Jul 2004 · Lego Z81 MCU = microcontroller A small CPU sometimes with RAM, ROM, EPROM, EEPROM, FLASH, or IO facilities onboard. Documentation on MCU's inside Honda ECU's is available here as well . -- Lego Z81 - 30 Jul 2004 - edited to remove "bad" link to http://pgmfi.org/phorum/mcudoc_browser.php