It is Venus Mini Doctor for Famicom with Disk System. You can use FDSStick or FDS Disk to load game. It support NROM and CNROM Games. You can use it to develop small game or program for Famicom.

https://youtu.be/fLiVUsNyX6E
https://youtu.be/JGEfEx7vwd0
https://youtu.be/M2_yl9gmRa4

* Maximum Game size is 32K PRG + 32K CHR. Total is 64K Bytes or 512K Bits.