This device can be used as a replacement for the Newbrain Tape. It connects through RS232 so you can load and save files using Device #9. Use “poke 19,9” to change the default load and save device.
You will need a Breakout Board for Micro SD Card Mini with SPI Interface GND, VCC, MISO, MOSI, SCK, CS. There is support for 5v or 3.3v devices. Also an Arduino Uno, a LCD 16×2 and a LCD Display I2C Interface Module.
You can use a PCB fabrication service like JCLPCB for the pcbs it costs around 10€ plus shipping for 5 PCBs or you can build it yourself as single layer and then use some cables to link the necessary routes as i did. The chip for translating voltages to RS232 levels is a MAX232. All electrical components(Capacitors, Resistors,etc) values used are clearly visible on the pcb. Some spacers is also needed. You need to power it with +5v. Arduino is attached to the bottom side so you need long SIL headers.
Only one directory level is supported. Pressing ‘Stop’ closes an open file if it exists else it goes to the root directory. ‘Play’ button acts as change directory if a directory is selected.