convert hex string back to binary

[Mark S Pryor]

Hello,

Using MySQL 4.017 on Win2k sp3:

using MySQL built-ins: how can I convert a
value stored as a hexadecimal string back to
a binary string while logged into the shell?

set @t1=616263;
select 0x616263;

how can I turn @t1 back into 0x616263? What is
the syntax? I tried
select concat('0x', @t1);
this returns an unevaluated literal!

tia,
msp