I've put a proposed P89LPC932 In-System-Programming
(ISP) connector pinout at
http://www.airborn.com.au/8051/proghdr.html

> WHY?
...As a suggested pinout, actually...

>The serial will be there anyhow and the unit
>would not work without a power supply.
...Ok, point taken. But RST and VDD need to be
connected for programming, and avoiding two
connectors speeds up manufacturing...

>The whole idea of ISP is that no circuitry is required.
...true, but this doesn't add circuitry, just
6 pins and a resistor...

Besides that, what do you think :-)