Product number (P/N): NRD2256,
Keywords/Tags: NRD2256
Date of intro-: ~1971, TimeKeeper IC's (sorted by Year): (Link),
Classification: / Part / Calculator-ChipSet,
Featuring: Logic-technology: VLSI (Very Large Scale Integration), calculator-on-a-Chip,
Serie-members: ROCKWELL_parts(E): NRD2256 (ChipSet); SHARP_parts(E): NRD2256 (ChipSet),
Info: The interaction between the SHARP: NRD2256 and ROCKWELL was a landmark collaboration that defined the birth of the microelectronics era.
It wasn't just a buyer-seller relationship; it was a high-stakes engineering partnership that moved computing from the desktop to the palm of the hand.
The NRD2256 was one of four primary chips in the ROCKWELL-made chipset.
Its specific job was timing and scanning
Keyboard Interface:
It monitored which keys were pressed.
Display Driving:
It managed the ‘digit scan’ process, ensuring that numbers appeared correctly on the vacuum fluorescent or Nixie tube displays.
Coordination:
It worked in perfect sync with the other chips (like the AU2271 and AC2261) to process arithmetic logic.
Used in: (Unknown manufacturer)_parts(E): P31 (PCB), SHARP_parts(E): 4041PCBD12 (PCB), SHARP_parts(E): 4041PCBD45 (PCB)