File:Hartwig sir.png|SIR, a reasoning engine
File:Hartwig scrudu.png|SCRUDU, the computer poet
File:Hartwig mouse.png|The inevitable rat (well, mouse in this case) in a labyrinthmaze
File:Hartwig eliza vorgesetzter.png|''[http://en.wikipedia.org/wiki/ELIZA ELIZA] Vorgesetzter'', an ELIZA implementation with a pointy-haired boss personality
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ELIZA .BAS 9K (chat bot similar to Joseph Weizenbaum's 1960s ELIZA program)
MMC4 .BAS 4K (path-finding mouse in a labyrinthmaze)
SCRUDU5 .BAS 9K (computer-generated poetry)
SIR .BAS 3K (reasoning engine)