HP 21MX E-series front panel keyboards

[Peter Brown]

Hi All,

How many types of front panel keyboard were used with the 2113 E-series CPU?

I have one in front of me that has two ribbon cables that run from the 
keyboard PCB to the CPU PCB (one from the top edge of the keyboard PCB one 
from the bottom edge) but I seem to remember having seen other 2113 CPU's 
where the keybaord PCB is smaller and a single cable runs from the bottom 
edge of the keyboard to the CPU PCB.

What I'm trying to do is find a 'short' front panel to replace the 
'embedded' keybaord of a 5420 Signal Analyser and turn it back into an mini 
E-series CPU.

I had assumed that I would be able to unbolt the top of a 2113 front panel 
and use just the keyboard portion of the assembly but the PCB behind the 
keyboard that I have turns out to be too tall!  Is there is shorter one 
available.

Can anyone shed any light on this one?

Cheers

Peter Brown