Ivan,

The 28C64 is an EEPROM. You can write individual bytes just as you would to a RAM however you must wait ~ 10ms between byte writes. A bit is supplied to allow you to monitor when the EEPROM is ready for the next byte. You can write in a "page" mode where you can send 16 bytes and then delay monitoring the toggle bit for when it is time for the next 16 bytes.

It's all in the data sheet.

regards,
p