Some More Little Goodies for 2068 (Edition 4)

Fourth installment of a recurring collection of short programs, POKE tricks, and machine code snippets for the TS-2068. Includes: printer on/off check; absolute line drawing PLOT/DRAW idiom; SCREENSAVE machine code routine; line edit at top of screen POKE; free memory in Spectrum mode; screen invert loop; COPY all 24 lines to printer; border color from keyboard input; RAMTOP POKE; elapsed time counter; key repeat stopper; even/odd detection; darker character image; double-space listing aid.