In section 3.7, The Ethereum Virtual Machine, the beigepaper states
The [EVM] memory stack has a maximum size of 1024-bits.
The yellow paper does not mention a unit, and the idea that the EVM stack is bound by literal bits doesn't make a lot of sense.
Rather, the EVM has a stack in which each item is a 256-bit word, and there may be a maximum of 1024 items in the stack.
Here's an additional source: https://www.ethervm.io/#stack
In section 3.7, The Ethereum Virtual Machine, the beigepaper states
The yellow paper does not mention a unit, and the idea that the EVM stack is bound by literal bits doesn't make a lot of sense.
Rather, the EVM has a stack in which each item is a 256-bit word, and there may be a maximum of 1024 items in the stack.
Here's an additional source: https://www.ethervm.io/#stack