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  NEC V20 D70108D-8
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The NEC V20 Processor
The NEC V20 is a 16-bit CMOS microprocessor with 8-bit external data bus, object-code and pin-compatible with the Intel 8088. The V20 runs at the same speed as the 8088, but it's slightly faster due to internal improvements - dual internal 16-bit data bus, faster effective address calculation, better loop counter/shift register implementation, and some others. The V20 includes Intel 8080 emulation mode, in which it can execute all of the 8080 instructions. Native NEC V20 instruction set includes all 8086/8088 instructions, new instructions from the 80186/80188 microprocessor, and instructions unique to V20 - bit processing, packed BCD instructions and special instructions for switching the processor to 8080 emulation mode and back.
The V20 is almost the same as the NEC V30 with the exception that the V30 has a 16-bit data bus.
NEC V20 D70108D-8
NEC V20 D70108D-8 Top Side
NEC Japan
8622H9 V20
D70108D-8 (c)'84 NEC
NEC V20 D70108D-8 Back Side
Comment by Martin Krause (mkrause[at]
I have/had an NEC V20. It was great; the extra speed was like something for nothing. It also runs much cooler than the Intel 8088 as it used CMOS instead of NMOS. I once built an all CMOS motherbourd with it and a bunch of other descreat logic like 74HCxxx instead of 74Sxxx. I was trying to build a PC that produced very little heat and therefore required little cooling.
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Core Frequency:8 MHz
Board Frequency:8 MHz
Data bus (ext.):8 Bit
Address bus:20 Bit
Manufactured:week 22/1986
Made in:Japan
Package Type:Ceramic
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