It is not a typo. The book is called "Asembler 6502" because it is a Polish book. It is a complete remake of the same book from 1987, with two additional chapters about WUDSN IDE and illegal opcodes. Marcin Sochacki wrote an extra chapter about WUDSN IDE from the ABBUC. Thanks, Marcin; this is awesome for me. Mainly because in the 90ies, being a "Poland Game" was a true sign of quality - and now the Polish coders use my IDE. What more can you achieve in life?
