8051 isp programming support

hi guyz......i have a trainer which uses philips microcontroller P89c51 series it has an in system programming capability in thr trainer. But im a little bit confused as i have seen only those isp which uses the MOSI, MISO, SCK pins of microcontroller but the trainer i have is using serial port connections TXD and RXD for isp programming, how can this be can the controllers be programmed with just serial port and no isp connecttion ?????

Is the device a RD2 or an RC2???

My bet is that the microcontroller has a bootloader in it.

Jon Wilder said:

My bet is that the microcontroller has a bootloader in it.

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Only the RD or RC series... That's why I asked the question...