PTM: If you have a project somewhat critical of pins, you could do like
this:

        pic PA0 |-----res--| counter
            PA1 |-----up---|
            PA2 |--R/W--   |_______________________
                |      |          |          ||||||
                |      |          A0         A1..A15
                |      |          |          ||||||
                |      -----------|--------  ||||||
                |                 |       |  ||||||
            PB0 |--D0/D4-----| 2x4bit    |--D0/D4--|
            PB1 |--D1/D5-----| tri-state |--D1/D5--| SRAM
            PB2 |--D2/D6-----| buffer    |--D2/D6--|
            PB3 |--D3/D7-----|           |--D3/D7--|

You write and read the data hinible + lonyble. Counter gives you A0 to
select HI, LO.
If you don't understand this picture, it is not for you, I'm not going to
explain it.
It works, I have used this kind of system before connected to LPT-port of
a PC.
If you find it usefull and use it, send me a emeil !


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PTM, pasi.mustalahti@utu.fi, ptmusta@utu.fi, http://www.utu.fi/~ptmusta
Lab.ins. (mikrotuki) ATK-keskus/Mat.Luon.Tdk                    OH1HEK
Lab.engineer (PC support) Computer Center                       OI7234
Mail: Turun Yliopisto / Fysla, Vesilinnantie 5, 20014
Pt 02-3336669, FAX 02-3335632 (Pk 02-2387010, NMT 049-555577)
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