Nortel NTV407MA 2 x 32KB Ram Expansion Module For Nortel Phone System – Surplus Select
Interfacing 8051 with 32KB RAM and EPROM from 8000H - YouTube
Fast Free Ship 16KRAM,256K FLASH 32KB RAM 1.64*2.2CM Strong Signal Small Volume NRF51822 Bluetooth 4.0 GT82C01 BLE Module|module|modul bluetooth 4.0module bluetooth - AliExpress