Hi Tony, The way it is set up is Zenith-89 act as a terminal, then the serial line connected to a board with all those chips. floppy disk is connected to same board too. That board has six serial lines, one to terminal, other to a scanning head, another to a press, another to control vacuum etc. This beast controls four color Heiderburg Press. This controller board has D70116D NEC chip too. (I guess 8086 plus some NEC stuff). Each color has a roller and ink bucket with 31 smaller buckets. With H-89 controller each bucket can move up or down. So on the paper you will get darker or liter color. With each graphic we get some kind of color bar on the side, what we do is scan the color bar with special head and that can adjust the all four rollers (i.e. 124 ink buckets). This runs with hdos system. On the start up I get Winchester controller present... msg. -------------- --------------- --------------- -------------- -------------- ------------ | H-89?19 | | controller | | Floppy | | Vacuum | | scan head | | Press | -------------- ---------------- --------------- -------------- -------------- ------------ |____________| | | |____________| | | | |_________________________| | |________________________________________ | I do not have clue about hdos. I know 8085/68000 assembler well. If can read(get source) the program on the disk, I can plug Linux machine. Thanks anil Tony Duell wrote: