first version of morning edition in python

fixwidth2.py

@@ -0,0 +1,70 @@
+#!/usr/bin/env python3
+"""
+TM-T88V paper width NV fix — attempt 2.
+Tries multiple memory switch group/value combinations.
+Writes directly to /dev/usb/lp0.
+"""
+import sys, time
+
+ESC = b'\x1b'
+GS  = b'\x1d'
+
+INIT   = ESC + b'\x40'
+FONT_A = ESC + b'\x4d\x00'
+CUT    = GS  + b'\x56\x00'
+DEV    = "/dev/usb/lp0"
+
+RULER = "123456789|123456789|123456789|123456789|12"
+
+def write_dev(data: bytes):
+    with open(DEV, "wb") as f:
+        f.write(data)
+
+def gs_e(fn: int, data: bytes) -> bytes:
+    """Build GS ( E pL pH fn [data]"""
+    payload = bytes([fn]) + data
+    pL = len(payload) & 0xFF
+    pH = (len(payload) >> 8) & 0xFF
+    return GS + b'\x28\x45' + bytes([pL, pH]) + payload
+
+def strip(label: str, nv_cmd: bytes):
+    body = (
+        f"\n[{label}]\n"
+        f"{RULER}\n"
+    ).encode("ascii")
+    write_dev(INIT + nv_cmd + INIT + FONT_A + body + b"\n\n" + CUT)
+    time.sleep(4)
+
+# ── Memory switch (fn=3): GS ( E 03 00 03 <group> <value> ──────────────────
+# group 1-8 control different settings; one of them holds paper width.
+# Trying both 0x00 (all bits clear = 80mm) and 0x80 (bit7 = 80mm candidate).
+MSW_TESTS = [
+    # (label, group, value)
+    ("fn3 grp1 val=0x00", 3, 1, 0x00),
+    ("fn3 grp2 val=0x00", 3, 2, 0x00),
+    ("fn3 grp3 val=0x00", 3, 3, 0x00),
+    ("fn3 grp4 val=0x00", 3, 4, 0x00),
+    ("fn3 grp5 val=0x00", 3, 5, 0x00),
+    ("fn3 grp6 val=0x00", 3, 6, 0x00),
+    ("fn3 grp7 val=0x00", 3, 7, 0x00),
+    ("fn3 grp8 val=0x00", 3, 8, 0x00),
+    # Same groups, value=0x80 in case the width bit is bit 7
+    ("fn3 grp6 val=0x80", 3, 6, 0x80),
+    ("fn3 grp7 val=0x80", 3, 7, 0x80),
+    # Customized values (fn=5): GS ( E 03 00 05 <id> <value>
+    ("fn5 id=0x01 val=0",  5, 0x01, 0x00),
+    ("fn5 id=0x02 val=0",  5, 0x02, 0x00),
+    ("fn5 id=0x03 val=0",  5, 0x03, 0x00),
+    ("fn5 id=0x04 val=0",  5, 0x04, 0x00),
+]
+
+if __name__ == "__main__":
+    print("Sending NV test strips. Watch for the first one that prints 42 chars wide.")
+    print("Each strip has its label printed on it. Power-cycle after the winning one.\n")
+    for entry in MSW_TESTS:
+        label, fn, param, val = entry
+        nv = gs_e(fn, bytes([param, val]))
+        print(f"  Trying: {label}")
+        strip(label, nv)
+    print("\nDone. Tell me which label was the first to print 42 chars wide.")
+    print("If none worked, all strips will be 30 chars and we need a different approach.")