converts this into something pablodraw will read: https://demozoo.org/graphics/370994/

toPablodraw.go

package main

import (
	"log"
	"os"
)

func main() {
	data, err := os.ReadFile("input.txt")
	if err != nil {
		log.Fatal(err)
	}
	
	replacements := map[string]byte{
		"▓": 219,
		"▒": 177,
		"░": 176,
		"█": 219,
		"▄": 220,
		"▀": 223,
		"▐": 222,
		"▌": 221,
	}

	var result []byte
	for _, r := range string(data) {
		if r == '\n' {
			// LF to CR
			result = append(result, '\r')
		} else if r < 128 {
			// ASCII
			result = append(result, byte(r))
		} else if cp437Val, exists := replacements[string(r)]; exists {
			// Unicode blocks to CP437
			result = append(result, cp437Val)
		} else {
			// Unknown Unicode
			result = append(result, '?')
		}
	}

	err = os.WriteFile("output.txt", result, 0644)
	if err != nil {
		log.Fatal(err)
	}

	log.Println("Done")
}