Hi, via eBay I got a small computer which I analyzed and reverse engineered in the last months. I got quite far and last week I came across an old thread in this group initiated by William Maddox in nov 2003 where he mentioned the unit: "RAF Tornado Computer with Core Store Memory ... eBay-link cut out ... A small airborne computer. From what look like date codes on the components, it looks like it was made in the early 80's, which seems a bit late for this technology." The seller had several of these units for sale. My question is wether anyone reading this group has probably acquired one of the units and is willing to share parts and/or information? Up to date I bulit a setup around the box consisting of a logic analyzer connected to many vital signals. A modified transputer board connected to a Sun Sparc 20 allows to read and write the core memory of the small computer. The box is a 12-bit machine with 8K words of memory. It has a 13-bit program counter and a 12bit accumulator register. Memory organisation is similar to PDP8. The cycle time is 1.2us and the complete memory of the box I have is functional. In reverse engineerineering the command set I dis- covered JUMP and a ADD command - So I am already able to write very simple programs for the box. But now lot of commands cause the CPU to freeze (even a reset cannot restart it - one has to power off and on again) and I cannot believe that such commands exist in a computer of this type. Maybe there is a defect located in the function-decode-board which contains the microcode in several small PROMs. It would be V E R Y helpful if one out there could at least borrow me his boards for a crosscheck (I do only need SK7 and above, not the core memory boards). Regarding William Maddox's comment about the date of the box: Regarding the architecture the box is very similar to PDP8 but mine has been built after 6/82 with the power supply been changed after 1982. This type of box was indeed developed for the tornado but - as far as I was able to find out - was not used. It might have been some kind of prototype device. Serialnumber is <50. The boards for core memory seem to be somewhat universal and even older in design - maybe they have been used in other devices, too... Any hints are welcome, best regards, Erik, erik at baigar.de. P.S. For pictures see http://www.baigar.de/TornadoComputerUnit/