Hi,
built a 16C84 PIC serial i/f as per the accompaning documentation and Vitaly's original firmware (N.B. there is a circuit error, needs a pull up on RTCC pin 3 on the 16C84).
Works perfectly on an old W98 box. Then tried on a Dell 8400 XP sp2 desktop a Dell Lattitude D600 laptop WP sp2 without success. Suspected that neither liked the +/- 5V signal levels, added a MAX 232 level shifter and a lab supply to eliminate supply issues. Scoped the RS-232 signals and they look fine, but absolutely no response when attempting to calibrate. Anybody had any similar experiences?
Is there a document that deals with WP setup & troubleshooting?