What is name of garage wall board?

It's 42 years old. It is the vertical walls and seems a type of particle board. And, what is equivalent used now? I didn't find this type in the big box stores. Have several spots/areas that need repaired/replaced.

https://preview.redd.it/whfa8i8sapyf1.png?width=624&format=png&auto=webp&s=971b514fa061ca1e6e60dfcb0256edb1327373d8

https://preview.redd.it/q8skgi8sapyf1.png?width=917&format=png&auto=webp&s=fcdff54482991c8c2262015733bd7416a189484b