gary@spock.atd.ucar.edu (Gary Horton) (10/10/90)
I'm on a Sparc 1+, running SunOS 4.1, and am attempting to send bytes via a serial port to an HP PaintJet to accomplish raster graphics. I have determined that zero-filled bytes cause confusion. Baud and parity are fine (9600, none) and I've used library routine ioctl() to configure the port for 'no post-processing'. All other values produce the expected raster image; does anyone know what to do to render zeroes usefully? Somewhere I've heard that serial ports discard null characters unless instructed otherwise. Oddly, with same serial port configuration, I do NOT have this problem on an HP9876A Thermal Printer (the only diff. being baud here is 19200); ergo, I did not initially suspect the port config'n. Could it be on the printer side? Please send replies directly to me; thanks very much for any help!!!