• Out-of-Stock
  • V20-MBC



Cpu Nec V20HL - uPD70108H (8088 + 8080) 4/8MHz (SW selectable), 128KB / 512KB / 1024KB RAM, 16 GPIO, I2C, RS232-TTL, HD emulation on SD, RTC with temperature sensor, Multi-boot management for max. 10 OS (currently supported OS with 16 HD each: CP/M-80, CP/M-86), Autoboot (direct binary load and execution from SD), iLOAD (automatic load and run executables files in Intel-Hex format), SW controlled User led and key, boot mode and system parameters user menu.

Kit: To assemble
Ram: 1024 KB
Product available with different options


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This Kit is no longer available, it has been replaced by a new Kit available at this link.

This project is released (hardware and software) under the GPL 3 license and was designed by Fabio Defabis (Just4Fun), more information is available at this link.

Attention, VAT and shipping costs change depending on the country of the customer.

Example calculation cost of the kit all inclusive

Country Kit VAT Shipping Total
Italy 59,00€  12,98€  6,90€ 78,88€
EU Area 59,00€ 12,98€ 14,25€ 86,23€
United States  59,00€ 0,00€ 18,65€ 77,65€
Australia 59,00€ 0,00€ 23,90€ 82,90€

The product is shipped from Italy to worldwide, with tracking code.

No customs fees, the customer will not pay customs fees, shipping by legal procedure.

Delivery time:
Italy: 1 working day, Sardinia and Sicily 2 working days
France: 4 working days
United Kingdom: 4 working days

Kit contents:
n. 1 Pcb lead-free blue
n. 1 Resistor 330 ohm 1/4W 5%
n. 2 Resistors 390 ohm 1/4W 5%
n. 3 Resistors 680 ohm 1/4W 5%
n. 1 Resistor 1 Kohm 1/4W 5%
n. 2 Resistors 4.7 Kohm 1/4W 5%
n. 9 Resistors 10 Kohm 1/4W 5%
n. 2 Disc Capacitors 22 pF
n. 15 Disc Capacitors 100 nF
n. 2 Electrolytis Capacitors 100 uF 16V.
n. 3 Diode 1N4148
n. 4 Diode 1N5817
n. 2 Led 3 mm. red
n. 1 Led 3 mm. yellow
n. 1 Led 3 mm. green
n. 1 Led 3 mm. blue
n. 1 Quarz 16 MHz
n. 1 74HC00
n. 1 74HC02
n. 1 74HC02
n. 1 74HC74
n. 2 74HC373
n. 1 D70108HCZ-16
n. 1 ATMEGA32A already programmed and ready to use
n. 1 MCP23017
n. 1 AS6C1008-55 (128KB)
n. 1 AS6C4008-55 (512 KB)
n. 2 AS6C4008-55 (1024 KB)
n. 3 Sockets DIP-14
n. 2 Sockets DIP-20
n. 1 Socket DIP-28
n. 2 Sockets DIP-32
n. 2 Sockets DIP-40
n. 1 Socket for Quarz
n. 1 Connector 1x2 male
n. 1 Connector 1x3 male
n. 1 Connector 1x6 male
n. 1 Connector 1x8 male
n. 1 Connector 2x10 male
n. 2 Connectors 1x6 female
n. 1 Connector 2x3 IDC male
n. 1 Connector 1x2 JST male
n. 1 Connector 1x2 JST female
n. 2 Pins plugin JST
n. 2 Jumpers
n. 2 Microswitch 6x6x5 mm.
n. 1 Module RTC modified
n. 1 Module microSD card
n. 1 Adapter cable USB RS232-TTL
n. 1 microSD with 15 disk and all programs
n. 1 Battery CR2032

0 Items

Data sheet

Nec V20
RAM Memory
128 KB
512 KB
1024 KB
To assemble
Rated 4.83 on the scale 1 - 5 based on 4 customer reviews
Verified purchase

Fantastic kit, slightly more challenging than the Z80-MBC2

This is a very complete kit, and includes details like LED spacers, an insulating pad for the crystal, and a red push button for reset. For my build, I used machined pin DIP sockets instead of the stamped sockets included in the kit. It worked on the first power up, booting right up into the CP/M. I really like the ROM and I/O emulation using the microcontroller, it is a very clean and extensible design.<br /> <br /> I also built the Z80-MBC2 and had a similar positive experience. I would say the V20-MBC is slightly more challenging to build as it has a few more parts. These kits are so much fun, I just ordered the 68K-MBC and look forward to building and experimenting with it.

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Verified purchase

Awesome quality again from the shop

After ordering the Z80-MBC2, I also ordered this kit. It looks promising and the quality is again 100%. The postal service again was a bit slow. This kit worked right out of the box and isn't really hard to build if you have beginners skills regarding assembling the kit together. I mounted the SD connector in an angle so it have room beside the atmega. McJohn shop is a good place to buy your stuff.

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Verified purchase

Very nice and compact board.

Build was fast and all parts fit very well. Board worked right off. Preprogrammed CPU is good as well. Data on the SD-card is also ok, it helps a great deal to get the board started. The combination with the uTerm is very positive as well. Either horizontal or vertical mounting makes it easier to find a suitable housing.

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Verified purchase

Great little board

Package received in less then a week and was well packed (ICs and sockets were well protected which is quite important).<br /> Board is well design and all parts marked so soldering was easy to be done. <br /> Think that is quite good that SD card comes with software on it and that ATMEGA32 is also pre-programmed so those without experience can enjoy right away.<br /> <br /> Thank you for this great product.

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