Standard Character String Control of Line Printer
Original Publication Date: 1980-Aug-01
Included in the Prior Art Database: 2005-Feb-13
Character string data intended for terminal devices can be directed to a line printer and result in a similar visual printed display. All character strings which contain instream commands and graphic data are transferred and decoded using I/O controller (IOC) microcode instructions which are contained in Control Storage 110 in Printer Adapter 100 (Fig. 3B) and executed in the IOC 10 (Fig. 3A). The general method for transferring and decoding character strings is shown by the block diagram in Fig. 1, and detailed instruction level microcode flow charts are shown in Figs. 1A, 1B and 1C. The character strings which are passed through the Printer IOC 10 come from a computer system (not shown). These strings are transferred and processed in eight-byte groups and are set up for the Printer 200 (Fig.