In System Programming Software
for Atmel’s AT89S51, AT89S52, AT89S53 and AT89S8252 Microcontrollers.
AEC Electronics In-System Programming (ISP) Software enables a PC to program Atmel’s AT89S microcontrollers while soldered in onto the PCB. A simple 5-way cable (that you can easily make yourself) is connected between the PC’s printer port and the target hardware. This DOS program is small (zipped to around 50KB) and fast. Programming algorithms have been optimised so that programing time is not machine dependent. These routines have been re-engineered to be even faster by only programming bytes that need programming. So, if a small program change is required during devepolment (and the device is not erased before re-programming), programming can be a fast as program verification!