WIP: Add Toshiba Tec LIUST-A00 utilities

WIP: It still needs some cleanup.

10 files changed, 1003 insertions, 0 deletions

diff --git a/liust-50/README.adoc b/liust-50/README.adoc
new file mode 100644
index 0000000..0ffeaaf
--- /dev/null
+++ b/liust-50/README.adoc
@@ -0,0 +1,18 @@
+LIUST-50
+========
+
+Included here are a simulator for the Toshiba Tec LIUST-A00 (LIUST-50)
+VFD line display, and a status program sending data to the device.
+
+For device documentation, see https://github.com/boricha/M202MD12D which is
+seemingly a project for the later LIUST-A10.
+
+Device setup
+------------
+ # stty -F /dev/ttyS0 9600 parenb oddp -crtscts -cstopb cs8
+
+Running
+-------
+ # liustatus > /dev/ttyS0
+
+ $ liustatus | liustsim
diff --git a/liust-50/charset/charset.go b/liust-50/charset/charset.go
new file mode 100644
index 0000000..61196d6
--- /dev/null
+++ b/liust-50/charset/charset.go
@@ -0,0 +1,211 @@
+package charset
+
+import (
+	"bytes"
+	_ "embed"
+	"image"
+	_ "image/png"
+	"log"
+)
+
+// Charsets are loosely based on CP 437 and JIS X 0201.
+
+var runesJapan2 = [256]rune{
+	-1, -1, -1, -1, -1, -1, -1, -1,
+	-1, -1, -1, -1, -1, -1, -1, -1,
+	-1, -1, -1, -1, -1, -1, -1, -1,
+	-1, -1, -1, -1, -1, -1, -1, -1,
+	0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
+	0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F,
+	0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
+	0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F,
+	0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
+	0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F,
+	0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
+	0x58, 0x59, 0x5A, 0x5B, '¥', 0x5D, 0x5E, 0x5F,
+	0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
+	0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F,
+	0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
+	0x78, 0x79, 0x7A, 0x7B, 0x7C, 0x7D, 0x7E, '⌂',
+	-1, -1, -1, -1, -1, -1, -1, -1,
+	-1, -1, -1, -1, -1, -1, -1, -1,
+	-1, -1, -1, -1, -1, -1, -1, -1,
+	-1, -1, -1, -1, -1, -1, -1, -1,
+	'▒', '｡', '｢', '｣', '､', '･', 'ｦ', 'ｧ',
+	'ｨ', 'ｩ', 'ｪ', 'ｫ', 'ｬ', 'ｭ', 'ｮ', 'ｯ',
+	'ｰ', 'ｱ', 'ｲ', 'ｳ', 'ｴ', 'ｵ', 'ｶ', 'ｷ',
+	'ｸ', 'ｹ', 'ｺ', 'ｻ', 'ｼ', 'ｽ', 'ｾ', 'ｿ',
+	'ﾀ', 'ﾁ', 'ﾂ', 'ﾃ', 'ﾄ', 'ﾅ', 'ﾆ', 'ﾇ',
+	'ﾈ', 'ﾉ', 'ﾊ', 'ﾋ', 'ﾌ', 'ﾍ', 'ﾎ', 'ﾏ',
+	'ﾐ', 'ﾑ', 'ﾒ', 'ﾓ', 'ﾔ', 'ﾕ', 'ﾖ', 'ﾗ',
+	'ﾘ', 'ﾙ', 'ﾚ', 'ﾛ', 'ﾜ', 'ﾝ', 'ﾞ', 'ﾟ',
+	'α', 'ß', 'Γ', 'π', 'Σ', 'σ', 'µ', 'τ',
+	'Φ', 'Θ', 'Ω', 'δ', '∞', 'φ', 'ε', '∩',
+	'→', '←', '↓', '↑', '½', '¼', '★', '◊',
+	'㎏', '℔', '�', '×', '▾', '▴', '日', ' ',
+}
+
+var runesInternational = [256]rune{
+	-1, -1, -1, -1, -1, -1, -1, -1,
+	-1, -1, -1, -1, -1, -1, -1, -1,
+	-1, -1, -1, -1, -1, -1, -1, -1,
+	-1, -1, -1, -1, -1, -1, -1, -1,
+	0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
+	0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F,
+	0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
+	0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F,
+	0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
+	0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F,
+	0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
+	0x58, 0x59, 0x5A, 0x5B, 0x5C, 0x5D, 0x5E, 0x5F,
+	0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
+	0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F,
+	0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
+	0x78, 0x79, 0x7A, 0x7B, 0x7C, 0x7D, 0x7E, '⌂',
+	'Ç', 'ü', 'é', 'â', 'ä', 'à', 'å', 'ç',
+	'ê', 'ë', 'è', 'ï', 'î', 'ì', 'Ä', 'Å',
+	'É', 'æ', 'Æ', 'ô', 'ö', 'ò', 'û', 'ù',
+	'ÿ', 'Ö', 'Ü', '¢', '£', '¥', '₧', 'ƒ',
+	'á', 'í', 'ó', 'ú', 'ñ', 'Ñ', 'ª', 'º',
+	'¿', '⌐', '¬', '½', '¼', '¡', '«', '»',
+	'░', '▒', '▓' - 1, -1, -1, -1, -1,
+	-1, -1, -1, -1, -1, -1, -1, -1,
+	-1, -1, -1, -1, -1, -1, -1, -1,
+	-1, -1, -1, -1, -1, -1, -1, -1,
+	-1, -1, -1, -1, -1, -1, -1, -1,
+	-1, -1, -1, '█', '▄', '▌', '▐', '▀',
+	'α', 'ß', 'Γ', 'π', 'Σ', 'σ', 'µ', 'τ',
+	'Φ', 'Θ', 'Ω', 'δ', '∞', 'φ', 'ε', '∩',
+	'≡', '±', '≥', '≤', '⌠', '⌡', '÷', '≈',
+	'°', '∙', '·', '√', 'ⁿ', '²', '■', ' ',
+}
+
+var runesInternationalVariants = []string{
+	"#$@[\\]^`{|}~", // USA
+	"#$à·ç§^`éùè╍",  // France
+	"#$§ÄÖÜ^`äöüß",  // Germany
+	"£$@[\\]^`{|}~", // UK
+	"#$@ÆØÅ^`æøå~",  // Denmark 1
+	"#¤ÉÄÖÅÜéäöåü",  // Sweden
+	"#$@·\\é^ùàòèì", // Italy
+	"₧$@¡Ñ¿^`╍ñ}~",  // Spain
+	"#$@[¥]^`{|}~",  // Japan
+	"#¤ÉÆØÅÜéæøåü",  // Norway
+	"#$ÉÆØÅÜéæøåü",  // Denmark 2
+	"#$á¡Ñ¿é`íñóú",  // Spain 2
+	"#$á¡Ñ¿éüíñóú",  // Latin America
+}
+
+var internationalVariantsChars = []byte{
+	0x23, 0x24, 0x40, 0x5B, 0x5C, 0x5D, 0x5E, 0x60, 0x7B, 0x7C, 0x7D, 0x7E}
+
+// ResolveCharToRune tries to decode a character into a Unicode rune.
+// It may return rune(-1) if the character is deemed to have no representation.
+func ResolveCharToRune(char, charset uint8) rune {
+	if charset == 0x63 {
+		return runesJapan2[char]
+	}
+	if int(charset) >= len(runesInternationalVariants) {
+		return -1
+	}
+
+	for i, b := range internationalVariantsChars {
+		if char == b {
+			return []rune(runesInternationalVariants[charset])[i]
+		}
+	}
+	return runesInternational[char]
+}
+
+// ResolveRune tries to find a corresponding character for a Unicode rune.
+func ResolveRune(r rune, charset uint8) (uint8, bool) {
+	if charset == 0x63 {
+		for i, ch := range runesJapan2 {
+			if ch == r {
+				return uint8(i), true
+			}
+		}
+		return 0, false
+	}
+	if int(charset) >= len(runesInternationalVariants) {
+		return 0, false
+	}
+
+	variantRunes := []rune(runesInternationalVariants[charset])
+	for i, ch := range variantRunes {
+		if ch == r {
+			return internationalVariantsChars[i], true
+		}
+	}
+	for i, ch := range runesInternational {
+		if ch == r {
+			return uint8(i), true
+		}
+	}
+	return 0, false
+}
+
+//go:embed japan.png
+var pngJapan2 []byte
+var imageJapan2 image.Image
+
+//go:embed germany.png
+var pngGermany []byte
+var imageGermany image.Image
+
+//go:embed international.png
+var pngInternational []byte
+var imageInternational image.Image
+
+func init() {
+	var err error
+	imageJapan2, _, err = image.Decode(bytes.NewReader(pngJapan2))
+	if err != nil {
+		log.Fatalln(err)
+	}
+
+	imageGermany, _, err = image.Decode(bytes.NewReader(pngGermany))
+	if err != nil {
+		log.Fatalln(err)
+	}
+
+	imageInternational, _, err = image.Decode(bytes.NewReader(pngInternational))
+	if err != nil {
+		log.Fatalln(err)
+	}
+}
+
+// ResolveCharToImage tries to decode a character into a 5x7 bitmap image
+// (white on black).
+func ResolveCharToImage(char, charset uint8) image.Image {
+	const (
+		gridWidth  = 6
+		gridHeight = 8
+	)
+
+	var src image.Image
+	var col, row int
+	if charset == 0x63 {
+		src, col, row = imageJapan2, int(char)/16, int(char)%16
+	} else if int(charset) < len(runesInternationalVariants) {
+		src, col, row = imageGermany, int(char)/16, int(char)%16
+		for i, b := range internationalVariantsChars {
+			if char == b {
+				src, col, row = imageInternational, i, int(charset)
+			}
+		}
+	} else {
+		return nil
+	}
+
+	x0 := col * gridWidth
+	y0 := row * gridHeight
+	return src.(interface {
+		SubImage(r image.Rectangle) image.Image
+	}).SubImage(image.Rect(
+		x0,
+		y0,
+		x0+gridWidth-1,
+		y0+gridHeight-1,
+	))
+}
diff --git a/liust-50/charset/germany.png b/liust-50/charset/germany.png
new file mode 100644
index 0000000..851f065
--- /dev/null
+++ b/liust-50/charset/germany.png
diff --git a/liust-50/charset/international.png b/liust-50/charset/international.png
new file mode 100644
index 0000000..b230a94
--- /dev/null
+++ b/liust-50/charset/international.png
diff --git a/liust-50/charset/japan.png b/liust-50/charset/japan.png
new file mode 100644
index 0000000..48260d8
--- /dev/null
+++ b/liust-50/charset/japan.png
diff --git a/liust-50/cmd/liustatus/status.go b/liust-50/cmd/liustatus/status.go
new file mode 100644
index 0000000..2c41e71
--- /dev/null
+++ b/liust-50/cmd/liustatus/status.go
@@ -0,0 +1,208 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strings"
+	"time"
+
+	"janouch.name/desktop-tools/liust-50/charset"
+)
+
+// TODO(p): Make more elaberate animations with these.
+var kaomoji = []struct {
+	kao, message string
+}{
+	{"(o_o)", ""},
+	{"(ﾟﾛﾟ)", ""},
+	{"(ﾟ∩ﾟ)", ""},
+	{"(^_^)", ""},
+	{"  (^_^)", ""},
+	{"(^_^)  ", ""},
+	{"(x_x)", "ｽﾞｷｽﾞｷ"},
+	{"(T_T)", "ｽﾞｰﾝ"},
+	{"=^.^=", "ﾆｬｰ"},
+	{"(>_<)", "ｹﾞｯﾌﾟ"},
+	{"(O_O)", "ｼﾞｰ"},
+	{"(-_-)", ""},
+	{"(-_-)", "ｸﾞｰｸﾞｰ"},
+	{"(o_-)", ""},
+	{"(-_o)", ""},
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+const (
+	displayWidth  = 20
+	displayHeight = 2
+	targetCharset = 0x63
+)
+
+type DisplayState struct {
+	Display [displayHeight][displayWidth]uint8
+}
+
+type Display struct {
+	Current, Last DisplayState
+}
+
+func NewDisplay() *Display {
+	t := &Display{}
+	for y := 0; y < displayHeight; y++ {
+		for x := 0; x < displayWidth; x++ {
+			t.Current.Display[y][x] = ' '
+			t.Last.Display[y][x] = ' '
+		}
+	}
+	return t
+}
+
+func (t *Display) SetLine(row int, content string) {
+	if row < 0 || row >= displayHeight {
+		return
+	}
+
+	runes := []rune(content)
+	for x := 0; x < displayWidth; x++ {
+		if x < len(runes) {
+			b, ok := charset.ResolveRune(runes[x], targetCharset)
+			if ok {
+				t.Current.Display[row][x] = b
+			} else {
+				t.Current.Display[row][x] = '?'
+			}
+		} else {
+			t.Current.Display[row][x] = ' '
+		}
+	}
+}
+
+func (t *Display) HasChanges() bool {
+	for y := 0; y < displayHeight; y++ {
+		for x := 0; x < displayWidth; x++ {
+			if t.Current.Display[y][x] != t.Last.Display[y][x] {
+				return true
+			}
+		}
+	}
+	return false
+}
+
+func (t *Display) Update() {
+	for y := 0; y < displayHeight; y++ {
+		x := 0
+		for x < displayWidth {
+			if t.Current.Display[y][x] == t.Last.Display[y][x] {
+				x++
+				continue
+			}
+
+			startX := x
+			var changes strings.Builder
+			for x < displayWidth &&
+				t.Current.Display[y][x] != t.Last.Display[y][x] {
+				changes.WriteByte(t.Current.Display[y][x])
+				t.Last.Display[y][x] = t.Current.Display[y][x]
+				x++
+			}
+
+			fmt.Printf("\x1b[%d;%dH%s", y+1, startX+1, changes.String())
+		}
+	}
+
+	os.Stdout.Sync()
+}
+
+func centerText(text string, width int) string {
+	textLen := len([]rune(text))
+	if textLen >= width {
+		return text[:width]
+	}
+	leftPad := (width - textLen + 1) / 2
+	rightPad := width - textLen - leftPad
+	return strings.Repeat(" ", leftPad) + text + strings.Repeat(" ", rightPad)
+}
+
+func kaomojiProducer(lines chan<- string) {
+	ticker := time.NewTicker(30_000 * time.Millisecond)
+	defer ticker.Stop()
+
+	idx := 0
+	for {
+		km := kaomoji[idx]
+
+		line := centerText(km.kao, displayWidth)
+		if km.message != "" {
+			line = line[:14] + km.message
+			line += strings.Repeat(" ", displayWidth-len([]rune(line)))
+		}
+
+		lines <- line
+
+		idx = (idx + 1) % len(kaomoji)
+		<-ticker.C
+	}
+}
+
+func statusProducer(lines chan<- string) {
+	ticker := time.NewTicker(1 * time.Second)
+	defer ticker.Stop()
+
+	temperature, fetcher := "", NewWeatherFetcher()
+	temperatureChan := make(chan string)
+	go fetcher.Run(5*time.Minute, temperatureChan)
+
+	for {
+		select {
+		case newTemperature := <-temperatureChan:
+			temperature = newTemperature
+		default:
+		}
+
+		now := time.Now()
+		status := fmt.Sprintf("%s %3s %s",
+			now.Format("Mon  2 Jan"), temperature, now.Format("15:04"))
+
+		// Ensure exactly 20 characters.
+		runes := []rune(status)
+		if len(runes) > displayWidth {
+			status = string(runes[:displayWidth])
+		} else if len(runes) < displayWidth {
+			status = status + strings.Repeat(" ", displayWidth-len(runes))
+		}
+
+		lines <- status
+		<-ticker.C
+	}
+}
+
+func main() {
+	terminal := NewDisplay()
+
+	kaomojiChan := make(chan string, 1)
+	statusChan := make(chan string, 1)
+
+	go kaomojiProducer(kaomojiChan)
+	go statusProducer(statusChan)
+
+	// TODO(p): And we might want to disable cursor visibility as well.
+	fmt.Printf("\x1bR%c", targetCharset)
+	fmt.Print("\x1b[2J") // Clear display
+
+	go func() {
+		kaomojiChan <- centerText(kaomoji[0].kao, displayWidth)
+		statusChan <- strings.Repeat(" ", displayWidth)
+	}()
+
+	for {
+		select {
+		case line := <-kaomojiChan:
+			terminal.SetLine(0, line)
+		case line := <-statusChan:
+			terminal.SetLine(1, line)
+		}
+		if terminal.HasChanges() {
+			terminal.Update()
+		}
+	}
+}
diff --git a/liust-50/cmd/liustatus/weather.go b/liust-50/cmd/liustatus/weather.go
new file mode 100644
index 0000000..c744f2f
--- /dev/null
+++ b/liust-50/cmd/liustatus/weather.go
@@ -0,0 +1,132 @@
+package main
+
+import (
+	"encoding/xml"
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+	"strconv"
+	"time"
+)
+
+const (
+	baseURL   = "https://api.met.no/weatherapi"
+	userAgent = "liustatus/1.0"
+
+	// Prague coordinates.
+	lat      = 50.08804
+	lon      = 14.42076
+	altitude = 202
+)
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+type Weatherdata struct {
+	XMLName xml.Name `xml:"weatherdata"`
+	Product Product  `xml:"product"`
+}
+
+type Product struct {
+	Times []Time `xml:"time"`
+}
+
+type Time struct {
+	From     string   `xml:"from,attr"`
+	To       string   `xml:"to,attr"`
+	Location Location `xml:"location"`
+}
+
+type Location struct {
+	Temperature *Temperature `xml:"temperature"`
+}
+
+type Temperature struct {
+	Unit  string `xml:"unit,attr"`
+	Value string `xml:"value,attr"`
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+// WeatherFetcher handles weather data retrieval.
+type WeatherFetcher struct {
+	client *http.Client
+}
+
+// NewWeatherFetcher creates a new weather fetcher instance.
+func NewWeatherFetcher() *WeatherFetcher {
+	return &WeatherFetcher{
+		client: &http.Client{Timeout: 30 * time.Second},
+	}
+}
+
+// fetchWeather retrieves the current temperature from the API.
+func (w *WeatherFetcher) fetchWeather() (string, error) {
+	url := fmt.Sprintf(
+		"%s/locationforecast/2.0/classic?lat=%.5f&lon=%.5f&altitude=%d",
+		baseURL, lat, lon, altitude)
+
+	req, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		return "", err
+	}
+
+	req.Header.Set("User-Agent", userAgent)
+
+	resp, err := w.client.Do(req)
+	if err != nil {
+		return "", err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return "", fmt.Errorf("API returned status %d", resp.StatusCode)
+	}
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", err
+	}
+
+	var weatherData Weatherdata
+	if err := xml.Unmarshal(body, &weatherData); err != nil {
+		return "", err
+	}
+
+	now := time.Now().UTC()
+	for _, t := range weatherData.Product.Times {
+		toTime, err := time.Parse("2006-01-02T15:04:05Z", t.To)
+		if err != nil || toTime.Before(now) {
+			continue
+		}
+		if t.Location.Temperature != nil {
+			temp, err := strconv.ParseFloat(t.Location.Temperature.Value, 64)
+			if err != nil {
+				continue
+			}
+			return fmt.Sprintf("%dﾟ", int(temp)), nil
+		}
+	}
+
+	return "", fmt.Errorf("no usable temperature data found")
+}
+
+// update fetches new weather data and returns it.
+func (w *WeatherFetcher) update() string {
+	temp, err := w.fetchWeather()
+	if err != nil {
+		log.Printf("Error fetching weather: %v", err)
+	}
+	return temp
+}
+
+// Run runs as a goroutine to periodically fetch weather data.
+func (w *WeatherFetcher) Run(interval time.Duration, output chan<- string) {
+	ticker := time.NewTicker(interval)
+	defer ticker.Stop()
+
+	output <- w.update()
+	for range ticker.C {
+		output <- w.update()
+	}
+}
diff --git a/liust-50/cmd/liustsim/simulator.go b/liust-50/cmd/liustsim/simulator.go
new file mode 100644
index 0000000..43e06d9
--- /dev/null
+++ b/liust-50/cmd/liustsim/simulator.go
@@ -0,0 +1,325 @@
+package main
+
+import (
+	"bufio"
+	"image"
+	"image/color"
+	"os"
+	"strconv"
+	"strings"
+
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/app"
+	"fyne.io/fyne/v2/canvas"
+
+	"janouch.name/desktop-tools/liust-50/charset"
+)
+
+const (
+	displayWidth  = 20
+	displayHeight = 2
+	charWidth     = 5 + 1
+	charHeight    = 7 + 1
+	magnification = 5
+)
+
+// TODO(p): See how this works exactly, and implement it.
+const (
+	cursorModeOff = iota
+	cursorModeBlink
+	cursorModeLightUp
+)
+
+type Display struct {
+	image      *canvas.Image
+	chars      [displayHeight][displayWidth]uint8
+	charset    uint8
+	cursorX    int
+	cursorY    int
+	cursorMode int
+}
+
+func NewDisplay() *Display {
+	return &Display{charset: 2}
+}
+
+func (d *Display) Clear() {
+	for y := 0; y < displayHeight; y++ {
+		for x := 0; x < displayWidth; x++ {
+			d.chars[y][x] = 0x20 // space
+		}
+	}
+}
+
+func (d *Display) ClearToEnd() {
+	for x := d.cursorX; x < displayWidth; x++ {
+		d.chars[d.cursorY][x] = 0x20 // space
+	}
+}
+
+func (d *Display) drawCharacter(
+	img *image.RGBA, charImg image.Image, cx, cy int) {
+	if charImg == nil {
+		return
+	}
+
+	bounds := charImg.Bounds()
+	width, height := bounds.Dx(), bounds.Dy()
+	for dy := 0; dy < height; dy++ {
+		for dx := 0; dx < width; dx++ {
+			c := charImg.At(bounds.Min.X+dx, bounds.Min.Y+dy)
+			if r, _, _, _ := c.RGBA(); r >= 0x8000 {
+				c = color.RGBA{0x00, 0xFF, 0xA0, 0xFF}
+			} else {
+				c = color.RGBA{0x20, 0x20, 0x20, 0xFF}
+			}
+			img.Set(1+cx*charWidth+dx, 1+cy*charHeight+dy, c)
+		}
+	}
+}
+
+func (d *Display) Render() image.Image {
+	width := 1 + displayWidth*charWidth
+	height := 1 + displayHeight*charHeight
+
+	img := image.NewRGBA(image.Rect(0, 0, width, height))
+	for y := 0; y < height; y++ {
+		for x := 0; x < width; x++ {
+			img.Set(x, y, color.Black)
+		}
+	}
+
+	for cy := 0; cy < displayHeight; cy++ {
+		for cx := 0; cx < displayWidth; cx++ {
+			charImg := charset.ResolveCharToImage(d.chars[cy][cx], d.charset)
+			d.drawCharacter(img, charImg, cx, cy)
+		}
+	}
+
+	return img
+}
+
+func (d *Display) PutChar(ch uint8) {
+	if d.cursorX >= displayWidth || d.cursorY >= displayHeight {
+		return
+	}
+
+	d.chars[d.cursorY][d.cursorX] = ch
+	d.cursorX++
+	if d.cursorX >= displayWidth {
+		d.cursorX = displayWidth - 1
+	}
+}
+
+func (d *Display) LineFeed() {
+	d.cursorY++
+	if d.cursorY >= displayHeight {
+		d.cursorY = displayHeight - 1
+
+		// XXX: This relies on displayHeight being exactly 2.
+		d.chars[0] = d.chars[1]
+		for x := 0; x < displayWidth; x++ {
+			d.chars[1][x] = 0x20
+		}
+	}
+}
+
+func (d *Display) CarriageReturn() {
+	d.cursorX = 0
+}
+
+func (d *Display) Backspace() {
+	if d.cursorX > 0 {
+		d.cursorX--
+	}
+}
+
+func (d *Display) SetCursor(x, y int) {
+	if x >= 0 && x < displayWidth {
+		d.cursorX = x
+	}
+	if y >= 0 && y < displayHeight {
+		d.cursorY = y
+	}
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+func parseANSI(input string) (command string, params []int) {
+	if !strings.HasPrefix(input, "\x1b[") {
+		return "", nil
+	}
+
+	input = input[2:]
+	if len(input) == 0 {
+		return "", nil
+	}
+
+	cmdIdx := len(input) - 1
+	command = string(input[cmdIdx])
+
+	paramStr := input[:cmdIdx]
+	if paramStr == "" {
+		return command, []int{}
+	}
+
+	parts := strings.Split(paramStr, ";")
+	for _, p := range parts {
+		p = strings.TrimSpace(p)
+		if val, err := strconv.Atoi(p); err == nil {
+			params = append(params, val)
+		}
+	}
+	return command, params
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+type escapeParser struct {
+	seq     strings.Builder
+	inEsc   bool
+	inCSI   bool
+	display *Display
+}
+
+func newEscapeParser(d *Display) *escapeParser {
+	return &escapeParser{display: d}
+}
+
+func (ep *escapeParser) reset() {
+	ep.inEsc = false
+	ep.inCSI = false
+	ep.seq.Reset()
+}
+
+func (ep *escapeParser) handleCSICommand() bool {
+	cmd, params := parseANSI(ep.seq.String())
+
+	switch cmd {
+	case "J": // Clear display
+		// XXX: No params case is unverified.
+		if len(params) == 0 || params[0] == 2 {
+			ep.display.Clear()
+		}
+	case "K": // Delete to end of line
+		// XXX: No params case is unverified (but it should work).
+		if len(params) == 0 || params[0] == 0 {
+			ep.display.ClearToEnd()
+		}
+	case "H": // Cursor position
+		y, x := 0, 0
+		if len(params) >= 1 {
+			y = params[0] - 1 // 1-indexed to 0-indexed
+		}
+		if len(params) >= 2 {
+			x = params[1] - 1
+		}
+		ep.display.SetCursor(x, y)
+	}
+	return true
+}
+
+func (ep *escapeParser) handleEscapeSequence(b byte) bool {
+	ep.seq.WriteByte(b)
+
+	if ep.seq.Len() == 2 && b == '[' {
+		ep.inCSI = true
+		return false
+	}
+
+	if ep.seq.Len() == 3 && ep.seq.String()[1] == 'R' {
+		ep.display.charset = b
+		ep.reset()
+		return true
+	}
+
+	if ep.inCSI && (b >= 'A' && b <= 'Z' || b >= 'a' && b <= 'z') {
+		refresh := ep.handleCSICommand()
+		ep.reset()
+		return refresh
+	}
+
+	if ep.seq.Len() == 6 && ep.seq.String()[1:5] == "\\?LC" {
+		ep.display.cursorMode = int(ep.seq.String()[5])
+		return true
+	}
+
+	return false
+}
+
+func (ep *escapeParser) handleControlChar(b byte) bool {
+	switch b {
+	case 0x0A: // LF
+		ep.display.LineFeed()
+		return true
+	case 0x0D: // CR
+		ep.display.CarriageReturn()
+		return true
+	case 0x08: // BS
+		ep.display.Backspace()
+		return true
+	default:
+		if b >= 0x20 {
+			ep.display.PutChar(b)
+			return true
+		}
+	}
+	return false
+}
+
+func (ep *escapeParser) handleByte(b byte) (needsRefresh bool) {
+	if b == 0x1b { // ESC
+		ep.reset()
+		ep.inEsc = true
+		ep.seq.WriteByte(b)
+		return false
+	}
+
+	if ep.inEsc {
+		return ep.handleEscapeSequence(b)
+	}
+
+	return ep.handleControlChar(b)
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+func main() {
+	myApp := app.New()
+	window := myApp.NewWindow("Toshiba Tec LIUST-50 Simulator")
+
+	display := NewDisplay()
+	display.Clear()
+
+	img := canvas.NewImageFromImage(display.Render())
+	img.FillMode = canvas.ImageFillOriginal
+	img.ScaleMode = canvas.ImageScalePixels
+
+	window.SetContent(img)
+
+	window.Resize(fyne.NewSize(600, 100))
+
+	go func() {
+		reader := bufio.NewReader(os.Stdin)
+		parser := newEscapeParser(display)
+
+		for {
+			b, err := reader.ReadByte()
+			if err != nil {
+				fyne.DoAndWait(func() {
+					window.SetTitle(err.Error())
+				})
+				return
+			}
+
+			if parser.handleByte(b) {
+				fyne.DoAndWait(func() {
+					img.Image = display.Render()
+					img.Refresh()
+				})
+			}
+		}
+	}()
+
+	window.ShowAndRun()
+}
diff --git a/liust-50/go.mod b/liust-50/go.mod
new file mode 100644
index 0000000..d2b87a2
--- /dev/null
+++ b/liust-50/go.mod
@@ -0,0 +1,42 @@
+module janouch.name/desktop-tools/liust-50
+
+go 1.25.1
+
+require (
+	fyne.io/fyne v1.4.3
+	fyne.io/fyne/v2 v2.6.3
+)
+
+require (
+	fyne.io/systray v1.11.0 // indirect
+	github.com/BurntSushi/toml v1.4.0 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/fredbi/uri v1.1.0 // indirect
+	github.com/fsnotify/fsnotify v1.9.0 // indirect
+	github.com/fyne-io/gl-js v0.2.0 // indirect
+	github.com/fyne-io/glfw-js v0.3.0 // indirect
+	github.com/fyne-io/image v0.1.1 // indirect
+	github.com/fyne-io/oksvg v0.1.0 // indirect
+	github.com/go-gl/gl v0.0.0-20231021071112-07e5d0ea2e71 // indirect
+	github.com/go-gl/glfw/v3.3/glfw v0.0.0-20240506104042-037f3cc74f2a // indirect
+	github.com/go-text/render v0.2.0 // indirect
+	github.com/go-text/typesetting v0.2.1 // indirect
+	github.com/godbus/dbus/v5 v5.1.0 // indirect
+	github.com/hack-pad/go-indexeddb v0.3.2 // indirect
+	github.com/hack-pad/safejs v0.1.0 // indirect
+	github.com/jeandeaual/go-locale v0.0.0-20250612000132-0ef82f21eade // indirect
+	github.com/jsummers/gobmp v0.0.0-20230614200233-a9de23ed2e25 // indirect
+	github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646 // indirect
+	github.com/nicksnyder/go-i18n/v2 v2.5.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/rymdport/portal v0.4.1 // indirect
+	github.com/srwiley/oksvg v0.0.0-20221011165216-be6e8873101c // indirect
+	github.com/srwiley/rasterx v0.0.0-20220730225603-2ab79fcdd4ef // indirect
+	github.com/stretchr/testify v1.10.0 // indirect
+	github.com/yuin/goldmark v1.7.8 // indirect
+	golang.org/x/image v0.24.0 // indirect
+	golang.org/x/net v0.35.0 // indirect
+	golang.org/x/sys v0.30.0 // indirect
+	golang.org/x/text v0.22.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
diff --git a/liust-50/go.sum b/liust-50/go.sum
new file mode 100644
index 0000000..4de0a8e
--- /dev/null
+++ b/liust-50/go.sum
@@ -0,0 +1,67 @@
+fyne.io/fyne v1.4.3 h1:356CnXCiYrrfaLGsB7qLK3c6ktzyh8WR05v/2RBu51I=
+fyne.io/fyne v1.4.3/go.mod h1:8kiPBNSDmuplxs9WnKCkaWYqbcXFy0DeAzwa6PBO9Z8=
+fyne.io/fyne/v2 v2.6.3 h1:cvtM2KHeRuH+WhtHiA63z5wJVBkQ9+Ay0UMl9PxFHyA=
+fyne.io/fyne/v2 v2.6.3/go.mod h1:NGSurpRElVoI1G3h+ab2df3O5KLGh1CGbsMMcX0bPIs=
+fyne.io/systray v1.11.0 h1:D9HISlxSkx+jHSniMBR6fCFOUjk1x/OOOJLa9lJYAKg=
+fyne.io/systray v1.11.0/go.mod h1:RVwqP9nYMo7h5zViCBHri2FgjXF7H2cub7MAq4NSoLs=
+github.com/BurntSushi/toml v1.4.0 h1:kuoIxZQy2WRRk1pttg9asf+WVv6tWQuBNVmK8+nqPr0=
+github.com/BurntSushi/toml v1.4.0/go.mod h1:ukJfTF/6rtPPRCnwkur4qwRxa8vTRFBF0uk2lLoLwho=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/fredbi/uri v1.1.0 h1:OqLpTXtyRg9ABReqvDGdJPqZUxs8cyBDOMXBbskCaB8=
+github.com/fredbi/uri v1.1.0/go.mod h1:aYTUoAXBOq7BLfVJ8GnKmfcuURosB1xyHDIfWeC/iW4=
+github.com/fsnotify/fsnotify v1.9.0 h1:2Ml+OJNzbYCTzsxtv8vKSFD9PbJjmhYF14k/jKC7S9k=
+github.com/fsnotify/fsnotify v1.9.0/go.mod h1:8jBTzvmWwFyi3Pb8djgCCO5IBqzKJ/Jwo8TRcHyHii0=
+github.com/fyne-io/gl-js v0.2.0 h1:+EXMLVEa18EfkXBVKhifYB6OGs3HwKO3lUElA0LlAjs=
+github.com/fyne-io/gl-js v0.2.0/go.mod h1:ZcepK8vmOYLu96JoxbCKJy2ybr+g1pTnaBDdl7c3ajI=
+github.com/fyne-io/glfw-js v0.3.0 h1:d8k2+Y7l+zy2pc7wlGRyPfTgZoqDf3AI4G+2zOWhWUk=
+github.com/fyne-io/glfw-js v0.3.0/go.mod h1:Ri6te7rdZtBgBpxLW19uBpp3Dl6K9K/bRaYdJ22G8Jk=
+github.com/fyne-io/image v0.1.1 h1:WH0z4H7qfvNUw5l4p3bC1q70sa5+YWVt6HCj7y4VNyA=
+github.com/fyne-io/image v0.1.1/go.mod h1:xrfYBh6yspc+KjkgdZU/ifUC9sPA5Iv7WYUBzQKK7JM=
+github.com/fyne-io/oksvg v0.1.0 h1:7EUKk3HV3Y2E+qypp3nWqMXD7mum0hCw2KEGhI1fnBw=
+github.com/fyne-io/oksvg v0.1.0/go.mod h1:dJ9oEkPiWhnTFNCmRgEze+YNprJF7YRbpjgpWS4kzoI=
+github.com/go-gl/gl v0.0.0-20231021071112-07e5d0ea2e71 h1:5BVwOaUSBTlVZowGO6VZGw2H/zl9nrd3eCZfYV+NfQA=
+github.com/go-gl/gl v0.0.0-20231021071112-07e5d0ea2e71/go.mod h1:9YTyiznxEY1fVinfM7RvRcjRHbw2xLBJ3AAGIT0I4Nw=
+github.com/go-gl/glfw/v3.3/glfw v0.0.0-20240506104042-037f3cc74f2a h1:vxnBhFDDT+xzxf1jTJKMKZw3H0swfWk9RpWbBbDK5+0=
+github.com/go-gl/glfw/v3.3/glfw v0.0.0-20240506104042-037f3cc74f2a/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
+github.com/go-text/render v0.2.0 h1:LBYoTmp5jYiJ4NPqDc2pz17MLmA3wHw1dZSVGcOdeAc=
+github.com/go-text/render v0.2.0/go.mod h1:CkiqfukRGKJA5vZZISkjSYrcdtgKQWRa2HIzvwNN5SU=
+github.com/go-text/typesetting v0.2.1 h1:x0jMOGyO3d1qFAPI0j4GSsh7M0Q3Ypjzr4+CEVg82V8=
+github.com/go-text/typesetting v0.2.1/go.mod h1:mTOxEwasOFpAMBjEQDhdWRckoLLeI/+qrQeBCTGEt6M=
+github.com/godbus/dbus/v5 v5.1.0 h1:4KLkAxT3aOY8Li4FRJe/KvhoNFFxo0m6fNuFUO8QJUk=
+github.com/godbus/dbus/v5 v5.1.0/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
+github.com/hack-pad/go-indexeddb v0.3.2 h1:DTqeJJYc1usa45Q5r52t01KhvlSN02+Oq+tQbSBI91A=
+github.com/hack-pad/go-indexeddb v0.3.2/go.mod h1:QvfTevpDVlkfomY498LhstjwbPW6QC4VC/lxYb0Kom0=
+github.com/hack-pad/safejs v0.1.0 h1:qPS6vjreAqh2amUqj4WNG1zIw7qlRQJ9K10eDKMCnE8=
+github.com/hack-pad/safejs v0.1.0/go.mod h1:HdS+bKF1NrE72VoXZeWzxFOVQVUSqZJAG0xNCnb+Tio=
+github.com/jeandeaual/go-locale v0.0.0-20250612000132-0ef82f21eade h1:FmusiCI1wHw+XQbvL9M+1r/C3SPqKrmBaIOYwVfQoDE=
+github.com/jeandeaual/go-locale v0.0.0-20250612000132-0ef82f21eade/go.mod h1:ZDXo8KHryOWSIqnsb/CiDq7hQUYryCgdVnxbj8tDG7o=
+github.com/jsummers/gobmp v0.0.0-20230614200233-a9de23ed2e25 h1:YLvr1eE6cdCqjOe972w/cYF+FjW34v27+9Vo5106B4M=
+github.com/jsummers/gobmp v0.0.0-20230614200233-a9de23ed2e25/go.mod h1:kLgvv7o6UM+0QSf0QjAse3wReFDsb9qbZJdfexWlrQw=
+github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646 h1:zYyBkD/k9seD2A7fsi6Oo2LfFZAehjjQMERAvZLEDnQ=
+github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646/go.mod h1:jpp1/29i3P1S/RLdc7JQKbRpFeM1dOBd8T9ki5s+AY8=
+github.com/nicksnyder/go-i18n/v2 v2.5.1 h1:IxtPxYsR9Gp60cGXjfuR/llTqV8aYMsC472zD0D1vHk=
+github.com/nicksnyder/go-i18n/v2 v2.5.1/go.mod h1:DrhgsSDZxoAfvVrBVLXoxZn/pN5TXqaDbq7ju94viiQ=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/rymdport/portal v0.4.1 h1:2dnZhjf5uEaeDjeF/yBIeeRo6pNI2QAKm7kq1w/kbnA=
+github.com/rymdport/portal v0.4.1/go.mod h1:kFF4jslnJ8pD5uCi17brj/ODlfIidOxlgUDTO5ncnC4=
+github.com/srwiley/oksvg v0.0.0-20221011165216-be6e8873101c h1:km8GpoQut05eY3GiYWEedbTT0qnSxrCjsVbb7yKY1KE=
+github.com/srwiley/oksvg v0.0.0-20221011165216-be6e8873101c/go.mod h1:cNQ3dwVJtS5Hmnjxy6AgTPd0Inb3pW05ftPSX7NZO7Q=
+github.com/srwiley/rasterx v0.0.0-20220730225603-2ab79fcdd4ef h1:Ch6Q+AZUxDBCVqdkI8FSpFyZDtCVBc2VmejdNrm5rRQ=
+github.com/srwiley/rasterx v0.0.0-20220730225603-2ab79fcdd4ef/go.mod h1:nXTWP6+gD5+LUJ8krVhhoeHjvHTutPxMYl5SvkcnJNE=
+github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
+github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
+github.com/yuin/goldmark v1.7.8 h1:iERMLn0/QJeHFhxSt3p6PeN9mGnvIKSpG9YYorDMnic=
+github.com/yuin/goldmark v1.7.8/go.mod h1:uzxRWxtg69N339t3louHJ7+O03ezfj6PlliRlaOzY1E=
+golang.org/x/image v0.24.0 h1:AN7zRgVsbvmTfNyqIbbOraYL8mSwcKncEj8ofjgzcMQ=
+golang.org/x/image v0.24.0/go.mod h1:4b/ITuLfqYq1hqZcjofwctIhi7sZh2WaCjvsBNjjya8=
+golang.org/x/net v0.35.0 h1:T5GQRQb2y08kTAByq9L4/bz8cipCdA8FbRTXewonqY8=
+golang.org/x/net v0.35.0/go.mod h1:EglIi67kWsHKlRzzVMUD93VMSWGFOMSZgxFjparz1Qk=
+golang.org/x/sys v0.30.0 h1:QjkSwP/36a20jFYWkSue1YwXzLmsV5Gfq7Eiy72C1uc=
+golang.org/x/sys v0.30.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/text v0.22.0 h1:bofq7m3/HAFvbF51jz3Q9wLg3jkvSPuiZu/pD1XwgtM=
+golang.org/x/text v0.22.0/go.mod h1:YRoo4H8PVmsu+E3Ou7cqLVH8oXWIHVoX0jqUWALQhfY=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=