The HY514100 is a 4M X 1 DRAM chip. So it provides one bit of storage at 2^22 addresses.

Eight of them ganged together provides 4M X 8 storage, or a single 4 MB, 8 bit wide memory SIMM.

There appear to be four (is double-sided, yes?) groups of eight chips on that SIMM. So each SIMM is providing: 4M X 1 (single memory chip) X 8 (eight chips wide) X 4 (four banks of eight) = 16M X 8 DRAM memory.

Or, a single 16MB 8 bit wide, 30 pin SIMM.

Unfortunately, you do need four of them in order for the Q950 to use it.

That is a classic example of a "composite" SIMM. A memory module taken way beyond the day's capacity by essentially putting several SIMM's worth of memory on one board and adding a little logic to decode the addressing and direct things properly. They are power hogs and tend to produce excess heat.

It would probably be less time and trouble just to find a nice set of four 16MB 30 pin SIMMs which are built out of 16M X 1 parts (eight chips) or 16M X 4 parts (two chips).

They used to be about $30/set on Ebay until Howard Electronics went out of business.