STM32F103C8T6 Orao

For this project I used a development board with STM32F103C8T6 microcontroller also known as "Blue Pill" and 23LC1024 serial SRAM. Both can be purchased on eBay for as little as 6 USD. 23LC1024 is optional, but without it Orao will have only 17 KB instead of 32 KB RAM.

Electronic schematic

The circuit generates a composite PAL video signal, and the programs are loaded via the analog audio input as with the original Orao computer.

Finished electronic circuit

In operation

Video captured directly from composite output.


stm32f103c8t6_orao_sram.bin  BIN file to burn into STM32F103C8T6 microcontroller
stm32f103c8t6_orao.bin  version without 23LC1024 SRAM

This page has been visited 194 times since 2020-11-06