Jujing Electronics (巨晶電子公司) was a publisher known to have retailed two Famicom titles on behalf of Hwang Shinwei and Hwang Jiun-Ming. These titles had a fairly limited distribution and low production run, Block Force cover being printed on standard paper and cut by hand, for example.
Article mentioning Jujing being the publisher of these two games.
Trivia[]
The cartridge shells were unique to this manufacturer. Similar but not identical molds are known to exist such as the one used by Assupo.
Both Jujing releases are notorious for their unusual copy protection scheme: their circuit board embed a microcontroller executing a custom program raising interrupts meant for CPU based on the cartridge signals. Both games depend on these interrupt to be fired appropriately to function.
The 1990 print of 3D Block, credited to RCM Group, reuse the same components (printed circuit board, and sometimes the same cartridge shell) as the 1989 release. The game logic had been simplified to not require the microntroller, leaving the spot unpopulated on the PCB. This suggests that Jujing is RCM Group, a related entity, or the remaining assets got transferred to RCM on Jujing closure.
