Product number (P/N): 250,
Keywords/Tags: 250
Date of intro-: 1981, TimeKeeper IC's (sorted by Year): (Link),
Classification: / Part / Calculator-Chip,
Featuring: Logic-technology: VLSI (Very Large Scale Integration), calculator-on-a-Chip,
Info: Extract from WIKIPEDIA:
In 1971 PICO ELECTRONICS and GENERAL INSTRUMENT introduced their first collaboration in ICs, a complete single chip calculator IC for the MONROE: Digital III calculator.
This chip could also arguably lay claim to be one of the first microprocessors or microcontrollers having ROM, RAM and a RISC instruction set on-chip.
The layout for the four layers of the PMOS process was hand drawn at x500 scale on mylar film, a significant task at the time given the complexity of the chip.

PICO was a spinout by five GI design engineers whose vision was to create single chip calculator ICs.
They had significant previous design experience on multiple calculator chipsets with both GI and MARCONI-ELLIOTT
The key team members had originally been tasked by ELLIOTT Automation to create an 8-bit computer in MOS and had helped establish a MOS Research Laboratory in Glenrothes, Scotland in 1967.
Used in: ROYAL: III