// SPDX-License-Identifier: Unlicense

#include <stdio.h>
#include <stdint.h>

static uint16_t lfsr = 0xff80;	/* [6:0] unused */

static void create_new_byte(void)
{
	int i;
	uint16_t b;

	for (i = 0; i < 8; i++) {
		b = ((lfsr << 4) ^ lfsr) & 0x8000;
		lfsr <<= 1;
		if (b) lfsr |= 0x0080;
	}
}

static uint8_t get_new_byte(void)
{
	return lfsr >> 8;
}

int main(int argc, char *argv[])
{
	int i;

	for (i = 0; i < 511; i++) {
		putchar(get_new_byte());
		create_new_byte();
	}

	return 0;
}