These are used EPROMs in varying shape (may have a couple bent pins), desired by many vintage console and computer collectors and hardware hackers alike.  We came across a small stash of these in our storage and when they are gone, they are gone!

They are erased and verified blank, please see additional picture for various conditions.

• Commodore 8-bit Computers & Drives: It is the go-to substitute for replacing faulty BASIC and Kernal ROMs in the Commodore 64 and VIC-20, as well as for repairing operating system chips in vintage Commodore disk drives (like the 8250LP).
• Vintage IBM PC Upgrades: It is a perfect substitute for the 8K mask-programmed ROMs used in the BIOS sockets of the original IBM PC 5150.
• A variety of Atari related projects, like rebuilding or modifying cartridges (such as custom Atari BASIC versions) and repairing disk drives without needing to rewire or use bulky socket adapters.