ICL1900

Unfortunately, when we scrapped out two 1905Es to install the Honeywell Level 66*, all the software tapes were thrown away. Particularly galling now is that these included source tapes for George (I & II) and Maximop; plus Exec tapes (E6RM) with listings also GIN5 and various engineers assemblers**. Many of us, however, kept manuals as souvenirs and so the only real regrets about missing ones there are the Programmers Reference Manual (only a photocopy, anyhow, but not easy to acquire) and most of the engineering documents (we had our own engineers ... and even did our own Exec mods - and even a couple of minor hardware mods). * oddly enough, it seems even harder to find anything related to GCOS 3 than the 1900. ** Application programmer thought PLAN was the assembler for the 1900; Systems programmers (thought they) knew that the real assembler was GIN5; The Engineers and Exec maintainers, however, had about 3 different mysterious (and extremely crude***) assemblers ... one was #NSBL, cannot remeber the name of the others *** so crude, in fact, that they used numeric (octal) opcodes rather than nmemonics - but then those were more meaningful to the people who probably knew the microcode by heart :-) Andy