diff --git a/NTSC-J 1.0/QFST.txt b/NTSC-J 1.0/QFST.txt
new file mode 100644
index 0000000..85e4610
--- /dev/null
+++ b/NTSC-J 1.0/QFST.txt	
@@ -0,0 +1,34 @@
+$ QF Segment Timer (v0.1.0, 2022/10/22) [sup39]
+040F9DD0 496FDE78
+042069D0 495F128C
+077F7C48 000000F0
+3BA00000 3C60817F
+93A37C40 93A37C44
+4A90217C 38610E90
+4A83D5C9 3821FFE0
+BF81000C 3C60817F
+3BE37C00 83C37C40
+3BA00096 80C300BC
+2C060000 41A2002C
+808300B8 80A37C44
+7C042800 40A1001C
+7C052050 57CC16BA
+7C1F612E 90837C44
+3BDE0001 93C37C40
+3B9EFFF0 2C1E0010
+40800008 3B800000
+7C1CF000 41A00014
+BB81000C 38210020
+3C60803B 4AA0ED00
+578316BA 7C1F182E
+1C0003E9 39600078
+7D405B96 396003E8
+7D2A5B96 1D6903E8
+7D4B5050 38600214
+7FA4EB78 38A0000D
+38C0FFFF 7CC73378
+48000011 2532642E
+25303364 00000000
+7D0802A6 4CC63182
+4BFF8511 3B9C0001
+3BBD000D 4BFFFF8C
diff --git a/src/QFST.ld b/src/QFST.ld
new file mode 100644
index 0000000..f01fc11
--- /dev/null
+++ b/src/QFST.ld
@@ -0,0 +1,12 @@
+/* @ha MUST be 0x817f */
+$QFST.ts = 0x817f7c00;
+$QFST.cnt = 0x817f7c40;
+$QFST.t0 = 0x817f7c44;
+$$ = 0x817f7c48;
+
+$QFT.tFreeze = 0x817f00b8;
+$QFT.freezeDur = 0x817f00bc;
+
+$b$.QFST.reset = 0x800f9dd0;
+$b$.QFST.render = 0x802069d0;
+drawText = 0x817f0238;
diff --git a/src/QFST.s b/src/QFST.s
new file mode 100644
index 0000000..0135af9
--- /dev/null
+++ b/src/QFST.s
@@ -0,0 +1,116 @@
+.set x, 532
+.set y, 150
+.set fontSize, 13
+.set colorTop, 0xffffffff
+.set colorBot, 0xffffffff
+.set logN, 4
+
+.set aBase, 0x817f<<16
+.QFST.reset:
+  li r29, 0 # orig
+  lis r3, aBase@h
+  stw r29, $QFST.cnt-aBase(r3)
+  stw r29, $QFST.t0-aBase(r3)
+  b 4+$b$.QFST.reset
+
+.set rmw, r28
+.set rmwOff, 0xC
+.set rmwAdd, 0x20
+.set rTArr, r31
+.set rCnt, r30
+.set rY, r29
+.set rIdx, r28
+.QFST.render:
+.QFST.render.setup:
+  addi r3, r1, 0xE90
+  bl J2DGrafContext.setup2D
+## prepare
+  addi r1, r1, -rmwAdd
+  stmw rmw, rmwOff(r1)
+  lis r3, aBase@h
+  la rTArr, $QFST.ts-aBase(r3)
+  lwz rCnt, $QFST.cnt-aBase(r3)
+  li rY, y
+.QFST.render.update:
+### check is QFT frozen
+### r6 = freeze duration
+  lwz r6, $QFT.freezeDur-aBase(r3)
+  cmpwi r6, 0
+  beq+ .QFST.render.update.done
+### check is new frozen time
+### r4 = tFreeze = QFT display time when freezed
+### r5 = t0
+  lwz r4, $QFT.tFreeze-aBase(r3)
+  lwz r5, $QFST.t0-aBase(r3)
+  cmpw r4, r5
+  ble+ .QFST.render.update.done
+### store diff
+  sub r0, r4, r5 # diff
+  rlwinm r12, rCnt, 2, 30-logN, 29
+  stwx r0, rTArr, r12
+### update t0 = tFreeze
+  stw r4, $QFST.t0-aBase(r3)
+### update cnt
+  addi rCnt, rCnt, 1
+  stw rCnt, $QFST.cnt-aBase(r3)
+.QFST.render.update.done:
+.QFST.render.preDraw:
+### idx = max(0, cnt-N)
+  subi rIdx, rCnt, 1<<logN
+  cmpwi rCnt, 1<<logN
+  bge .QFST.render.preDraw.L1
+  li rIdx, 0
+.QFST.render.preDraw.L1:
+.QFST.render.loop:
+  cmpw rIdx, rCnt
+  blt+ .QFST.render.loop.body
+.QFST.render.done:
+  lmw rmw, rmwOff(r1)
+  addi r1, r1, rmwAdd
+## orig
+  lis r3, 0x803b
+  b 4+$b$.QFST.render
+.QFST.render.loop.body:
+### QF -> s
+  rlwinm r3, rIdx, 2, 30-logN, 29 # offset
+  lwzx r0, rTArr, r3
+#### r0 = dQF*1001
+  mulli r0, r0, 1001
+#### r10 = dQF*1001/120 = ms
+  li r11, 120
+  divwu r10, r0, r11
+#### r9 = ms/1000 = s
+  li r11, 1000
+  divwu r9, r10, r11
+#### r10 = ms-s*1000 = ms%1000
+  mulli r11, r9, 1000
+  sub r10, r10, r11
+### params
+  li r3, x
+  mr r4, rY
+  li r5, fontSize
+.if colorTop < 0x8000 || colorTop >= 0xffff8000
+  li r6, colorTop@l
+.else
+  lis r6, colorTop@h
+  ori r6, r6, colorTop@l
+.endif
+.if colorTop == colorBot
+  mr r7, r6
+.elseif colorBot < 0x8000 || colorBot >= 0xffff8000
+  li r7, colorBot@l
+.else
+  lis r7, colorBot@h
+  ori r7, r7, colorBot@l
+.endif
+  bl .draw2D.fmt
+  .string "%2d.%03d"
+  .align 2
+.draw2D.fmt:
+  mflr r8
+  crclr 6
+  bl drawText
+## next
+  addi rIdx, rIdx, 1
+  addi rY, rY, fontSize
+  b .QFST.render.loop