Reply 20 of 30, by mkarcher
Robhalfordfan wrote on 2023-02-08, 21:15:ok i should be safe use buy use the nec chips without any problem and will the wires make the ce on pin 30 on the nec chip, pull low or high and thought it was ground pin the wire is going on the 68882 which the trace is going to NC pin (maybe i am looking at wrong datasheet)
You look at the right datasheet, but with the wrong perspective. The socket pinout is usually depicted for looking into the holes of the socket. If you look at the back of the board, you get a mirror image. Pin A1 (the Vcc pin at coordinate A1, not the address line A1) is at the corner with the golden "Y". The bodge wire is at the inner pin in the corner clockwise from the Y looking at the chip markings, or counter-clockwise looking at the solder connections. If you look carefully, you can see pin A1 having a square pad on the solder side. As the data sheet is not for the solder side, going clockwise from A1 locates you at the corner with K1 (which happens to carry the signal A1), but the bodge wire is at the inner edge of that corner, that's pin H3, carrying the signal A0, as I wrote in my previous post. There is a trace from H3 to F1, which is /SIZE.