The original enlarger was a simple BASIC program that demonstrated how to enlarge an object, but was horribly slow. This is the assembler version that drastically improves the speed and adds a couple more pictures.
JSZeddy, by Erik Olofsen based on JSSpeccy and Z81 emus.
For programs that don’t auto-run, press R then ENTER.
Also you may need to click on the applet to enable keyboard entry.