DEC used to use the first letter of the suffix for density, and the second letter for the chip manufacturer.
On Wed, Jul 10, 2019 at 12:08 PM Glen Slick via cctalk < cctalk@classiccmp.org> wrote: > > The simple answer is to install it in a uVAX2 system and see what it > > says :-) > > Or look up the part number on one of the DRAM chips, count the number > of DRAM chips, and then work out the total. > > If the M7609 uses 256Kbit DRAM chips (as all MS630 boards do), then 9 > of them are 256KB with parity, 36 of them are 1MB, and the total of > 288 256Kbit DRAM chips on the M7609 is a total of 8MB. >