On 08 Oct 2008 22:28:12, Chuck Guzis wrote: Why right you are. For those of you who aren't reading at home, these mnemonics mean: SPIM: Space immediate (1-3 lines) SKIP: Skip immediate (to carriage control channel) SKAP: Skip after printing (carriage control) SPAP: Space after printing (1-3 lines) All of these were control instructions that referenced the printer (unit #9). The carriage control tape was a standard 12 channel one (IBM used them on LOTS of printers like 407's and 1403's). You could access any one of the 12 channels. The 1620 had two indicators for "summary line" (channel 9) and "end of printable page" (channel 12), which if you have a hard copy impact printer are probably still there. Yes, if you skipped to a channel that WASN'T punched, you fed lots of paper, which is why (if you were smart) you punched the unused channels on the same line as the "end of paper" channel (12). Oh, standard Fortran: blank, single space; 1, top of form; 0, double space; +, overprint (not supported everywhere). Feel free to consult your friendly Unix man page for the program 'asa' for further reference. One of these days I'll dig out the computer pic I made back in the late 60's using a video camera connected to an 1130. 16 levels of gray, and 200x160 or so resolution. Cool for the day!