Preliminary schematic for the OLED version
TZXduino ported to "Blue Pill" STM32 board
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Preliminary schematic for the OLED version
With the aid of a logic analyzer I Have found that the chip select signal was coming from another pin than the expected.
Now the SD card is working.
It took me a long run to adapt the code, but I could finally boot in on the Blue Pill.
Steps involed:
Board shall be configured as Generic STM32F103C series
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Thanks! I believe that the TZX file format can be used with your nanocomputer, as it contains not only the bits in the file but also information on the waveform (https://www.worldofspectrum.org/TZXformat.html)
I follow the principle KISS :-) and use a simpler format: https://acdc.foxylab.com/sites/default/files/cpm4nano_tape_fmt.png
I know the board was named after 'The Matrix' but the pun is irresistible, lol!!
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Good Old School !!!
In my "nanocomputer" (#Homebrew CP/M-computer powered by Arduino Nano) I also made it possible to write and read memory images using an audio signal (I tested using the linear output / input of a "big" computer, it remains to find the old tape recorder that I used with the ZX Spectrum in 199x). But I used format with 128 byte blocks and pauses between them - this is due to the fact that I use I2C RAM, and the "nanocomputer" must have time to write a data block into memory during a pause between blocks.