This part of this MPS10 document goes over each of the modules making up the MPS10 system

http://www.willegal.net/blog/wp-content/uploads/2019/11/MPS-modules.pdf

Although this 8008 system has a feature set that is similar to other 8008 computers, there are some differences that make this system unusual.

Memory support for the MPS10 is typical of other 8008 systems, with from 1k to 16K of memory. The SRAM module used 2102 type memories and the EPROM card took up to 16 1702A EPROM chips.

One of the unusual features is the UART incorporated into the main CPU card. The UART supports a full duplex serial interface.

The main processor board also has a berg connector intended to interconnect with the Monitor/Control module with a “standard cable”. The Monitor/Control Module is mounted in it’s own cabinet, outside the M-series chassis that holds the rest of this system. The monitor and control module was intended for maintenance and program debug only. It supports typical debug operations such as read and write memory, running, stopping and stepping programs. It also contains a ROM with bootstrap program.

Finally, the MPS10 included an External Event Detection Module (EEDM) which supported up to 8 external interrupts and a power fail detection circuit. I’d say the extra external interrupt support was added because of the vision of using this system in process control applications and the weakness of the 8008 regarding interrupt handling capability.

Also mentioned is the foundation module, which is supposed to support user hardware interfacing. I don’t know much about the DEC “M” series chassis, but it appears that these foundation modules are some sort of standard prototyping boards, that were already being sold by DEC.