Nicely written Werner. Very clear and I must say reading it takes me back to my days of writing terminal programs in 6502 assembler. The machine I was writing for would shift the bits into a register one at a time and fire an irq off when a full byte was done. You'd then read the byte, toggle a bit to clear the register and signal that you had read it and clear the irq flag. Writing a byte was the same process in reverse (i.e. irq to signal that a full byte had been shifted out)
Regards, Freemor
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