Deskpro L series is very very hard to find these days this one is based on single CPU board motherboard version of dual slot motherboard used in Compaq's Systempro.
I had searched hard during what to do deciding what Compaq models to collect last year, and I wanted to have L but there is no processor cards around let alone complete system.
So I settled down to get Deskpro M (now two, one out of two was built from parts which was $$$, minus the power supply board which is also nearly impossible to get as a separate part, ANYWHERE else.), and Deskpro i (complete computer purchased), purchased Deskpro 386e/25 motherboard and brought Kingston memory expansion card and put into complete computer that was deskpro 386s.
Yes, Compaq stuff, not the consumer computers (easy to get still, not the 486, they don't have external cache ever, Pentium and later did have cache by default), but not same deal as true business/real workhorse type.
64K cache slot is very, very common in some models of compaq 486 boards but 64K cache card itself is impossible to get dictated what compaq models to get which was ones that already have cache by default.
Reason that people bought new compaq computers back in the day, without 64K cache card was costly since have cache controller along with 8 smaller SRAM ICs and bunch of components. This would be easier if was standardized sockets or passive cache modules. But no, compaq is not making this easier decision or easy to add cache later on for us.
Cheers,
Great Northern aka Canada.