2002 (was:: Looking for pointers to old Control Data software)

Hello Hans, you are certainly welcome to it - after all its only bits and not a single atom, so it can be copied easily. However, there is no documentation apart from source code comments - it's a (hopefully) portable C program plus some ASCII data files, so it should run on anything that has a C-compiler. Since your address makes me believe that you are affiliated with Siemens Munich, and since I live in Munich too, maybe we just get together and discuss this ? I will send you my coordinates in private email. The simulator maps core and drum to RAM arrays, papertape input and output to File I/O, and the console to keyboard/screen. It would be neat to interface to a real S2002 console - there are at least two in Munich, one at the Siemens museum and one at the Deutsche Museum; maybe that would be a fun project to try one of these to agree to that proposal ????? The compiler I have is in fact the Alcor Triplex Main S2002, the result of a thesis (not mine) done at Mainz University in 1968, extending Algol by the data type TRIPLEX which is an interval representation of a floating-point number: [lower-bound, standard-f.p., upper-bound] Any operation on triplex numbers will produce the min/max values resulting studied. This is theoretically nice, but in practice you can invert a 10x10 matrix only if you are lucky and it is conditioned extremely well, otherwise some pivot interval will include 0 resulting in a divide error. In those days there were fears that one could not do any calculation involving millions of f.p. operations because of roundoff - that turned out to be really academic. John G. Zabolitzky