https://en.wikipedia.org/wiki/Coordinating_Committee_for_Mul...
AFAIK 8-bit chips weren't really covered by this anymore during the 80's, but apparently the Amiga fell under the embargo for being 'too powerful'... probably a convenient marketing myth ;)
The Eastern countries were pretty quick to build clones of popular chips though (mostly Z80s and x86, Bulgaria also built MOS 6502 and Motorola 6800 clones).
A community center in an outer district of Budapest have organized a "micro club" every week, I can't find a definite date of when it started, this photo is titled "some time around 1986" http://gpsgames.hu/data/games/2796/2796_1.jpg Every Friday people would haul their various microcomputers to this place and swap programs and chat. Copyright ... we kind of knew it was not "legal" but noone cared.
Those were the days.
In fact, I read that one reason for the opening up of the USSR under Gorbachev was that the Soviets realized that they couldn't both maintain a totalitarian dictatorship and keep up in information technology.
(I read this stuff awhile ago and my memory of the details is vague. For example, I don't know if those policies existed in Hungary specifically.)
East Germany put a lot of effort into tech-education though. The "glorious leadership" realized that they were quickly falling behind in high-technology during the 70's, and they actually tried to fix this.
Most of the 8-bit computers that Eastern Germany started to manufacture in '84 were former 'grass-roots' designs done by hardware engineers as side projects.
When the government desperately needed cheap hardware for education, those side projects got green-lit and were developed into official projects. This is where reality kicked in again unfortunately, the limited resources of the "real-socialist economy" didn't allow for the mass production necessary to fulfill private demand, so everything that was built went to schools and universities (at least!), but also military academies.