MM11-K core memory
MM11-K core memory is a rare UNIBUS main memory system which is effectively an earlier, smaller version of the common MM11-L core memory.
Like the MM11-L, it consists of three cards, two of them the same as those of the MM11-L:
- G110 - hex-format memory control logic and data channels
- G231 - hex-format memory driver logic
The MM11-K also includes an 8 Kbyte H213 quad-format core memory stack card, instead of the 16 Kbyte H214 card of the MM11-L. It uses all the same custom backplanes as the MM11-L.
On the G110 module, two jumpers (W9 and W10) are set depending on whether it is being used with a 8 Kbyte or a 16 Kbyte core stack; on the G231 module, two other jumpers (J3 and J4) are similarly set depending on the size.
Documentation
MM11-K documentation does not appear to be extant; it is covered in the "PDP-11/05 Technical Manual" (EK-11005-TM-003), Chapter 12, "MM11-K and L Detailed Descriptions"; and the MM11-L documentation is of course largely applicable.
