As per my knowledge there is no mainstream LGA775 board available with DDR1 support. LGA775 was launched to switch from DDR1 to DDR2. There were couple of intermediate motherboards based on 865 and 920 (a modified version of 915) to accept LGA775 based P4 processors, but the official availability was just couple of months. Currently there is no such product available from mainstream brands like Asus, MSI, Gigabyte, Asrock etc.
Try the local market for some Mercury or Zebronics motherboards which may satisfy your requirement. Check for 865GV5 chipset based motherboard as it has support for LGA775 based P4 and DDR1 ram