I'd rather not say :) But on the hacks note... Digging through the binders I got with it, I have found: 1) Front panel assembly instructions. The 16 pin cable is installed on the correct side of the board (not on the component side). However interpretation of pin one is vague. I quote: CP-A TO MPU-A INSTALLATION 30) Using the 16 conductor ribbon cable with 16 pin 3M dual inline connectr, insert one end into the hole pattern U2 from the back side of the CP-A board so that it can be soldered from the front (component side) of the CP-A board. The cable should be mounted so that it extends upward from the top of the chassis when the board is mounted. End quote. Which end of the cable you choose to solder to the CP-A will changed the orientation of the red (pin 1) stripe. 2) Not schematics, but drawings of the trace layouts, front and back. This allows me to ID the panel as a CPA REV.4. The actual label with the IMS Assoc. etc. is on the component side, hidden under the metal bar that supports the switches. 3) Modification instructions. This allows me to identify two of the modifications: One is a DRAM mod, apparently changing how S-100 pin 71 is interpreted. This mod is given the number: ECN 77-0039. The other is a change to the behavior of the one-shots (74123s) to prevent spurious triggering while in RUN mode. This mod is given the number: ECO 77-0098. There is a third modification to this panel which involves the lower right 7400 when viewed from the component side (labeled U25 in the drawing I have). Thanks, Bill