DEC did that a lot; used one silkscreen (and etch) for two different modules, with differing componet sets to produce two different boards (e.g the MSV11-D and -E: http://gunkies.org/wiki/MSV11-D_MOS_memory M8044 and M8045 respectively; the boards all say 'M8045' in the etch, you have to look at the handles). The H214 is the 16-bit wide version of this board, used in the MM11-L UNIBUS memory: https://gunkies.org/wiki/MM11-L_core_memory The parity MM11-LP uses the H215 (an 18-bit wide version), and a G109 instead of the G110 (again, same etch, some components left off for the G110. There's also an H213, used in the MM11-K: https://gunkies.org/wiki/MM11-K_core_memory which is an 8KB version; the H213 looks identical to the H214 at first glance, but if you look closely the core mats are only half as dense. Noel