Currently, I'm using shift registers to output address lines A2 to
A16 on a 64Kbit SRAM.  I've connected A0 and A1 directly to the PIC so
I can get at any of the four bytes with very little overhead.  Writing
two bytes to the external memory with this technique still takes lots
of cycles - around 280 all in all, with handshaking the shift register
and the SRAM chip and putting out the address bits.  I have the data
lines connected directly to the PIC as well.

BTW, I've been off net for a month and a half, anyone waiting for
e-mail responses should get them soon (8 megs of mail to read...).

-- vinsci