root@rdpclient:~# tvservice -c "NTSC 4:3"
Powering on SDTV with explicit settings (mode:0 aspect:1)
root@rdpclient:~# gcc devmem3.c -o devmem3 && ./devmem3
           C 0x00177009
          VC 0x00000033
 VSYNCD_EVEN 0x000001ae
       HORZA 0x003c0040 (60 64)
       HORZB 0x000e02d0 (14 720)
       VERTA 0x00100003 (16 3)
       VERTB 0x000300f0 (3 240)
  VERTA_EVEN 0x00100003 (16 3)
  VERTB_EVEN 0x000400f0 (4 240)
       INTEN 0x00000000
     INTSTAT 0x00000000
        STAT 0x00000644
DSI_HACT_ACT 0x000002d0