Ceramic CERDIP Signetics 82S129F bipolar PROM 256x4 new blank or programmed with your data file if you wish with free World shipping. The pictures are of the actual batch you will get. These are mostly sought for Apple 1 replicas. Direct payment via PayPal is also available, just PM me. Other PROMs (including many with open collector/OC if needed), PLDs, PALs, GALs, PEELs, or EPROMs are also available, programmed or not, with free world postage, just ask:
https://www.tindie.com/products/retro_devices/vintage-new-old-stock-1-piece-ceramic-82s129-prom/