Nascom News­let­ter

printed if double spaced mode.

The fourth flag (bit 7) is set if a page is to be repeated, with the number of repeats being found in the second register. This is checked at the end of each page, the marker for this being 01, which needs to be set in 1010H for the Generate command. If a page marker is sent to this routine then a CR is output as a signal to the printer, then the CR flag is reset in preparation for the next page. A check is then made for the repeat flag. If it is not get then the Naspen Text and Window pointers are set to the next page (lines 49 & 50) and Naspen warm started so that it is ready to print it when asked. If the flag is set then the stack pointer is reset by popping its top two registers. Then, after checking that a number has been entered into the register and that the number requested has not been printed, the program jumps to the Naspen routine to repeat the printing of the page.

The other two routines not yet mentioned are the start and finish routines. The first character to be output by Naspen is a null. When this is received, the routine jumps to LBL6, where the mode flags are checked. The last character is 02 and this is converted to a CR to allow the printer to finish.

While not being a very comprehensive print routine and though the modes have to be set manually before printing, I have found this a very useful addition and I hope that you do too.