Giddings & Lewis EIA Interface Circuit Board 501-03168-00 / 502-02804-50 m00559

This listing is for one used Giddings and Lewis EIA Interface circuit board, assembly number 501-03168-00, schematic number 502-02804-50, manufactured by Giddings and Lewis Electronics. A board number is visible at the upper left of the component side. This is a large-format double-sided PCB with metal card guide rails on both the top and bottom edges and gold-fingered edge connectors along the left and right sides for backplane installation. The board is densely populated with rows of 14-pin and 16-pin DIP integrated circuits marked with National Semiconductor DM74LS family designations including DM74LS00N, DM74LS08N, DM74LS30N, DM74LS42N, DM74LS86N, DM74LS174N, DM74LS513AN, and DM74LS536N devices, along with Motorola and Texas Instruments equivalents. A gold-lidded ceramic package IC is visible at board position BB1 center, accompanied by a metal can crystal oscillator marked 2.764 MHz. Red disc capacitors and yellow bypass capacitors are distributed throughout. Multiple test points are labeled TP1 through TP12. The board functions as an EIA serial communications interface processor within Giddings and Lewis CNC machine tool control systems. This product has been discontinued by the original manufacturer and is available as a surplus replacement. All components appear visually present with no visible signs of burning, cracking, or missing parts. Buyers are responsible for confirming compatibility with their specific machine configuration prior to purchase.

Stock # 0226-559