Product number (P/N): NRD2256,
Keywords/Tags: NRD2256
Date of intro-: ~1970, TimeKeeper IC's (sorted by Year): (Link),
Classification: / Part / Calculator-ChipSet,
Featuring: Logic-technology: LSI (Large Scale Integration), calculator-chipset,
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: BURROUGHS: C3260, DummyBrand: QT8D, SHARP: EL160, SHARP: QT8B, SHARP: QT8D, SHARP_parts(E): 4041PCBC1 (PCB), SHARP_parts(E): 4041PCBC11 (PCB), SHARP_parts(E): 4041PCBD2 (PCB), SHARP_parts(E): 4041PCBD9 (PCB), SHARP_parts(E): 436PCBC11 (PCB)