This is a demo of a Grundy Newbrain Home computer Based on Zilog z80 @4Mhz.
I am using an arduino uno connected to a SD Card and communicating with the Newbrain using the RS232 Serial port.
By using poke 19,9 i change the default storage device to RS232 so i could use load and save as usual. You can see the real speed of the Newbrain as it paints graphics on the screen.
If possible have the diagram, circuit, Arduino SD connected to newbrain. Thanks.
Check this article here https://newbrainemu.eu/new/2024/07/23/newbrain-tape-replacement/.
If you need any help feel free to ask.