Adding either the FP11-A or KK11-A is fairly simple (provided there is adequate power available); they are plugged into the backplane slot next to the two CPU boards, and special over-the-top connectors (OTT) in the form of small PCB cards are used to connect them up.
(It is not clear why DEC adopted a design which used the OTT cards, although avoiding them would have required the more-expensive upgrade path of a new backplane; there may also not have been enough spare pins on the edge connectors.)
The KK11-A needs only an H8821 two-connector OTT card (40-pin connectors, although the ones used in the H8821 also have 2 blank pins on each end, i.e. the physical form is that of a 44-pin), which goes from the KK11-A to the M8265 card of the CPU.
The FP11-A needs both an H8821, and also the smaller 54-12416 two-connector OTT card, which goes from the M8266 card of the CPU to the FP11-A (28-pin connectors, although 2 pins on each end, and 4 in the centre, are blocked off).
If both an FP11-A and a KK11-A are plugged in, things become slightly more complex. The FP11-A has to be mounted in the slot next to the CPU boards, and the KK11-A has to be mounted in the second slot up from that one.
(The KY11-LB Programmer's Console is mounted in the slot in the middle; as far as is known, there is nothing special about that slot, and the KY11-LB could just have been moved over one slot, but DEC must have decided that the documentation would be simpler if it were always in the same slot.)
Instead of the two-connector H8821 OTT card, the very similar H8822 OTT card, with three connectors, must be used instead.
The interface to the KY11-LB was carried over two 10-wire cables connected to Berg headers (denominated J1 and J2) on the M8266 module. The pinout for P1 is the same as for the KD11-E; P2 has additional signals (other than uPC08) added in the KD11-EA, though:
- Micro-PC 08
- FP11-A Attached
- Micro-PC 09
- Service Br Power Fail
- Load Instruction Register
- Power Fail Br Pending
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Clones: CM 1420