Thanks everyone,
yes, we're aware of the adapters but have kept this old PC around simply due to issues we have with some of our installers who can't get them to work in their systems. this PC has been old reliable and always works with the 9 pin serial port interface and still does with the exception of the backlight no longer works. we could use it with a flashlight I guess
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but we will have a PC there with or without an adapter to do these updates one way or another. we will be able to update GTX 23, 33, 330 and the GTX 3X5 units for experimental installations only.
let me know if there are any other questions.