It's not clear.
When the SETBLOCK function fails because the requested size was too large, it returns the maximum available size that the block can be resized to. However, DOS already resized the memory block to that maximum available size. This is almost certainly a bug, one that Microsoft didn’t dare fix in later DOS versions.
，这一点在搜狗输入法下载中也有详细论述
800 Annual Plan – $579/year
Bob’s world stretched