X on the console: /dev/tty0, a palette, and startx that works

Xorg finds its VT through /dev/tty0, and without one ran on none: the
console went on drawing into the framebuffer over the X screen. tty0 is
the terminal on screen, as on Linux. FBIOPUTCMAP succeeds, as it does on
a true-colour Linux framebuffer, instead of 256 logged errors per start.

schos-base gives root a .xserverrc with -dumbSched, Xorg's switch for
input on the main loop: SchOS has no threads, and Xorg crashed in
pthread_join on its input thread when the first client left. It adds
the hostname to /etc/hosts, so xauth can resolve schos:0.

zsh loses PROMPT_SP: on a serial terminal narrower than the console its
padding wrapped and left a # above every prompt. bootcheck knows zsh's
prompt and matches without colour codes, so busybox's ls reads as text.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01S1giNvrHTrPMPw7V6x1kQ4

kernel/dev/fb.c

@@ -230,6 +230,13 @@ fb_ioctl(int request, addr_t arg)
   // blanking does too, as Linux's own drivers without the hook do.
   case FBIOBLANK:
     return 0;
+
+  // A palette, on a framebuffer that is always true-colour. Linux's drivers
+  // keep the values for the console's sixteen colours and succeed; refusing
+  // made Xorg's fbdev driver log an error for every entry it loads, 256 of
+  // them at each start.
+  case FBIOPUTCMAP:
+    return 0;
   }
 
   return -ENOTTY;