timk@xenitec.on.ca (Tim Kuehn) (03/14/90)
I have a CI-3500 printer with a serial interface that normally hooks up to a VAX that I'd like to hook up to a PC instead. Unfortunatly I don't have the pinouts on the serial port (if someone has them - it's the model 10 interface - I'd be grateful for a copy), but I do know that it supports the xon-xoff protocol. My problem is that the version of DOS I have doesn't recognize the SW handshaking, only HW handshaking. If I tie the appropriate lines together on the PC's serial port, it transmits full speed without stopping, and as a result there are places in the printout that are missing large quantities of information. IF the lines aren't tied together, then I get a "Write fault error writing to device COM1:" So what I need is a TSR I can run which will grab the serial port interrupt vector, watch the port, and when it recieves a XON signal, return a "Busy" condition to BIOS, and when it get an XOFF signal, return a "Ready" condition to BIOS. Is there someone out there who's done something similar and would be willing to send me a copy of their code, or enough of a code fragment that I can patch the rest together myself? Thanks for any and all help! +-----------------------------------------------------------------------------+ |Timothy D. Kuehn timk@xenitec.on.ca | |TDK Consulting Services !watmath!xenitec!timk | |871 Victoria St. North, Suite 217A | |Kitchener, Ontario, Canada N2B 3S4 (519)-741-3623 | |DOS/Xenix - SW/HW. uC, uP, DBMS. Quality SW Guaranteed | +-----------------------------------------------------------------------------+