UPD4990

From NeoGeo Development Wiki

Revision as of 20:00, 4 March 2012 by Furrtek (talk | contribs)

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

Jump to navigation Jump to search

uPD4990 RTC in a (dirty) 1FZS MVS slot.

The uPD4990 is a RTC (Real Time Clock) chip made by NEC, used on MVS boards to keep the calendar's time and date.

It shares the battery-backed RAM's battery and has a separate 32.768kHz crystal clock to run even when power is off.

Datasheet

Official uPD4990A datasheet: [[1]]

Retrieved from "https://wiki.neogeodev.org/index.php?title=UPD4990&oldid=1793"

Chips