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[ EARLY X86 PROCESSORS // IDENTIFIED CPU ]

NEC V20 (μPD70108)

NEC V20 series introduced 1982; V20HL is low-power CMOS revision where marked. 16-bit internal x86-compatible execution, 8-bit external data, 20-bit address, common 40-pin DIP, NEC extensions.

Original functional schematic for NEC V20 (μPD70108), not a product photograph or pinout
MODEL-SPECIFIC LOCAL SCHEMATIC // NOT TO SCALE

MODEL IDENTIFICATION: NEC V20 (μPD70108). Match full model suffix, stepping and package to the physical item and cited documentation.

Recorded specifications

Cataloged modelNEC V20 (μPD70108)
Era / familyNEC V20 series introduced 1982; V20HL is low-power CMOS revision where marked.
Model specifications16-bit internal x86-compatible execution, 8-bit external data, 20-bit address, common 40-pin DIP, NEC extensions.
Compatibility8088-compatible board/clock; not 8086 bus replacement.
Variants / limitsV20 differs from 16-bit bus V30; suffix/grade changes electrical limits.

Compatibility and variants

  • 8088-compatible board/clock; not 8086 bus replacement.
  • V20 differs from 16-bit bus V30; suffix/grade changes electrical limits.
  • Check system-vendor CPU support, board revision, firmware minimum, package, memory, cooling and power before installation; similar socket naming does not prove compatibility.

Service and archival notes

Record full suffix, clock and software extension detection; keep original 8088.

Archive the complete marking/OPN/sSpec, stepping, physical condition, tested host revision, firmware, memory population, cooling, and test conditions. Distinguish published limits from measurements.

Sources & further reading

  1. Model lookup — NEC V20 (μPD70108)Model-specific package and specification cross-reference.
  2. Manufacturer technical documents — NEC V20 (μPD70108)Archived manufacturer data sheets/manuals for the exact family.
  3. Computer History Museum — NEC V20 (μPD70108) historyInstitutional history of early microprocessor development.
  4. Tech History Stories — The NEC V20: Intel's Forgotten RivalIndependent video review; treat as supplementary context, not primary manufacturer documentation.

Use the matching manufacturer data sheet revision and platform vendor’s CPU list for final fit decisions.