Old SIMMs 16 Mb memory kit ! Four 4 Mb modules Toshiba, 80ns, non-parity, tested on ASR-10, K-2000. It work very good and stable.(I purchased it from Syntaur prod. only $150!!!)Instuctions for installation is attached. Price 50$ for all. Buyer pay shipping, I'm from Russia. Mail me for detailed answer: provereno@pisem.net