/* Internal ROM and MODE0/MODE1 Pins */
Examples for hardware that uses a uPD7811 with its internal ROM disabled: Schneider [[NLQ401]] printer, Roland TR-909 Drumcomputer. Reportedly it can also happen that dealers for electronic components are shipping 7811 chips when one has ordered a 7810. Unknown why that is happening (possibly they might do contain BIOSes that turned out to contain software bugs, that were produced in too high quantities).
== Datasheets ==