Difference between revisions of "UPD4990"
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Latest revision as of 19:13, 15 June 2020
There are two versions used, the DIP 14 pin uPD4990AC and the SOP 16 pin uPD4990AG.
It shares the battery-backed RAM's battery and has its own 32.768kHz crystal to run even when power is off.
The parallel command inputs aren't used, they are all set high to enable serial commands (see MVS schematics page 1, and datasheet).
Official µPD4990A datasheet: []