An F21d board with 4 chips, 1 F21d 68pin CLCC, 1 32 pin 1Mx8 UVPROM,
3 32Kx8 or 128Kx8 FAST SRAM DIP chips. This board is about credit card
size and although double sided is not surface mount. A surface mount
two sided version with DRAM and SRAM could be smaller as in the
proposed Forth stamp or even about half that
size using a package smaller than CLCC for F21.