Matrix user forums

When AT89S52 uses the serial port (with USB to serial cable) to download the program, which download software is used?
STC MCU has download programs corresponding to each MCU on its official website, such as STC_ISP_V488. What is the use of AT89S52? My laptop does not have a parallel port.
Introduction of AT89S52: https://www.utmel.com/components/at89s5 ... eet?id=600

We use Atmel Flip 2.4.4 to load software into AT89C series MCU's. Might still be available somewhere in the Microchip site still. Program is ancient and has its quirks.
2.4.6 was not working correctly for us for some reason.

The AT89 series has bootloader that is inside the chip from factory.