This project is a remake of Radio-86RK - a soviet ham radio computer. The original design was published in Radio Magazine, an amateur radio and DIY electronics oriented publication, starting from April 1986. Hence the "Radio" and "86" in the name ("RK" stands for ham radio computer).

Specifications

Processor: Intel 8080A / КР580ВМ80А CPU running at 1.78 MHz

Memory:

• RAM: 32 KiB SRAM
• ROM: 2 KiB UV EPROM with system monitor software

Video: Intel 8275 / КР580ВГ75 CRT Controller

• Alphanumeric display
• 2 KiB UV EPROM with font
• Composite monochrome video output (50 Hz)

Audio:

• Intel 8253 / КР580ВИ53 PIT (single channel)
• CPU INTE output

Parallel Interface:

• Intel 8255А / КР580ВВ55А PPI
• 26-pin expansion header
• Can be used to connect ROM cartridges or other peripherals

Serial Interface:

• Intel 8251А / КР580ВВ51А USART
• DE-9 connector

Built-in 67-keys keyboard

• Cherry MX or compatible keys

Cassette recorder interface

What is included

This listing includes only the Radio-86RK PCB and two ROM Cartridge PCBs. All other parts can be purchased from various electronic components distributors, eBay, or perhaps you already have them in your parts bin! Please refer to the Bill of Materials section of the README file for the parts list.