hi,

Currently what I have in mind is an AT89S8252 40-pin DIP, external RAM, memory-mapped LCD and keypad, RS232, and probably an I2C (DS1337 RTC?) and some SPI device (to be determined).

Some contra:

- AT89S8252 has no PCA built-in. So it will not be possible for a user to play with it;
- the derivative has no I²C module so it will be "software emulated" interface only;
- it has no ADC built-in which may be useful for some projects.

For me, I preffer AT89C51ED2 or AT89C51ID2. Or, as fantastic idea, the AT89C5132 - it has most of anybody may need (ADC, SPI, I²C, PCM/I²S, USB, IDE/ATAPI, MMC etc) for about 15USD.

From other side, AT89S8252 chip is widespread. As SPI slaves I may suggest some devices:
- ADC,
- RTC,
- DataFlash

Regards,
Oleg