PC hardware and software since early IBMPC days and still at it.
Early RT hardware and software continuing with AIX through 1992.
NT4 server and workstation install/upgrade since 1996.
Linux Mandrake 5.1 through 8.2, install and administer with multi-boot
since fall of 1998.
Programming languages include APL, Awk, Basic, C, C++, Labview(serial interface and courseware development), MySQL, Pascal, Python, Perl and shell work in dos, borne, bash, and c.