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zasm: invert emulator io_write() handling
This facilitates debugging. To know the value of `A` at any point, you can do `out (0), a`. The number of bytes in the output will be the value of `A`.
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@ -18,7 +18,8 @@ init:
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call USER_CODE
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; signal the emulator we're done
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; BC contains the number of written bytes
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ld a, b
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ld a, c
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ld c, b
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out (c), a
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halt
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@ -32,7 +32,7 @@ static uint8_t io_read(int unused, uint16_t addr)
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static void io_write(int unused, uint16_t addr, uint8_t val)
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{
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written = (val << 8) + (addr & 0xff);
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written = ((addr & 0xff) << 8) + (val & 0xff);
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running = 0;
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}
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