graphics: fixed pixels not plotting on non crt_color

assets/bios/tandemport.js

@@ -1,37 +1,26 @@
 con.curs_set(0)
 con.clear()
 let t=`${system.maxmem()>>>10} Kbytes System`
-// 0b_HL where H is top pixel
-// H-bits
-let imgh = [
-[252,0,3,0,0],
-[48,0,3,0,0],
-[51,239,191,102,255],
-[51,237,191,66,219],
-[52,45,161,126,219],
-[54,109,179,124,219]];
-// L-bits
-let imgl = [
-[252,0,3,0,0],
-[51,207,31,60,254],
-[48,109,191,66,219],
-[54,109,179,102,219],
-[52,45,161,96,219],
-[51,237,159,60,219]];
-let imgc = [32,220,223,219]
-for (let y=0;y<imgh.length;y++) {
-for (let x=0;x<imgh[0].length;x++) {
-for (let b=7;b>=0;b--) {
-con.mvaddch(y+1,1+x*8+7-b,imgc[(imgh[y][x]>>b&1)<<1|imgl[y][x]>>b&1])
-}}}
+let imageBits = gzip.decomp(base64.atob(
+"H4sICC62h2ACA3RhbmRlbV9sb2dvXzI0MC5iaW4AhdQ/bsMgGAXwh4hEhyisHSq5R+iYISpX6REydqhkjsZRfASPDJbJ449jQuxUspDsn2XD+z6wAMSIPjiECQOgAwcoIMwQNuoAQ+2TilZlrehbdeioJqspypeTqgfttrXLqhvVljO9qypq/IPqrLLRblcZQQi8oyqqClZwiI+6cdHPVYcdlUnHVmdc5aooypVV+iaS+lYnXMUr9dQjkk6LMsEt/YkRcKL8WlQPj+BO+NtW/vFZpc06Ununcan1S9r3rHL+X+3HgwpkHaim1bPglVSFqFzTpsZeWzWncUZRd+DLTg+HOskL8Jv1+ErtiZk7PaKu4I6W6n8jph+1S+pRd85dOX/Wq6h9UmOjTqg71kAsykD2dI4qnZ5R75RVexbirmWXGSuTTlGF0wH1Dt1R02pg81BtfTIYp5L6qFh0OVWe1NUnUtIb4Dr/QbAEAAA="
+))
+for (let y = 0; y < 40; y++) {
+    for (let x = 0; x < 30; x++) {
+        let octet = imageBits[y * 30 + x]
+        for (let i = 0; i < 8; i++) {
+            graphics.plotPixel(8*x + i, y+8, ((octet >>> (7 - i)) & 1 != 0) ? 255 : 239)
+        }
+    }
+}
 con.move(8,1+(40-t.length>>1))
 print(t)
 // wait arbitrary time
-for (let b=0;b<333333;b++) {
+for (let b=0;b<system.maxmem()*10;b++) {
     sys.poke(0,(Math.random()*255)|0)
     sys.poke(0,0)
 }
-con.clear();
+con.clear()
+graphics.clearPixels(255)
 
 ///////////////////////////////////////////////////////////////////////////////