@sergiovds@dgar All of them and one of these too. The white rectangle is a card (think: floppy credit card). 256bytes per side. Yes half a kb per card. 4k of ROM and 4k of RAM for loading the programs, & storing the data. We managed full accounting s/w, using overlays, programmed in an OCTAL machine code. And there was an RS232 connection for the IBM Golfball typewriter to print out the reports. #retroComputing