The ASM source-code of the Furby has been released. (yes, that weird 90s noisy virtual pet thingy)
I believe the processor is a more limited version of the 6502, as all the code I've seen is 6502 compatible.
Have fun!
https://archive.org/details/furby-source
Furby source code in 6502
Furby source code in 6502
Chibi Akuma(s) Comedy-Horror 8-bit Bullet Hell shooter! // 「チビ悪魔」可笑しいゴシックSTG ! // Work in Progress: ChibiAliens
Interested in CPU's :Z80,6502,68000,6809,ARM,8086,RISC-V
Learning: 65816,ARM,8086,6809
Interested in CPU's :Z80,6502,68000,6809,ARM,8086,RISC-V
Learning: 65816,ARM,8086,6809