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There's a bug lurking in the VAL() function of most early implementations of Microsoft BASIC that has the power to corrupt your program. We demonstrate it on the Commodore 64 and VIC-20, but it's present on many other 6502-based machines, as well as Z80 and even 6809 computers as discovered by many helpful people on the internets. We then attempt to explain why the bug happens: it's the result of a kind of nasty hack using Microsoft BASIC's evaluation routine combined with the particular edge case when an overflow error occurs. The VIC-20 Quick Reference Handbook by Jeff Daniels: https://jeffdaniels.itch.io/vic-20-qu... Tool Kit: BASIC https://archive.org/details/Compute_s... Allen Huffman's blog: https://subethasoftware.com/2023/08/1... All the X-Tweets: / 1692238191720600008 / 1692313328209559923 / 1693074790855102861 / 1692300818815283262 / 1692368840569851958 Closing song lyrics "Call An Awesome Superhero" by Robin's son, aged 5. To support 8-Bit Show And Tell: Become a patron: / 8bitshowandtell One-time donation: https://paypal.me/8BitShowAndTell 2nd channel: / @8-bitshowandtell247 Index: 0:00 A bit about VAL() 2:31 + Addition or Concatenation? 4:42 10 A=VAL("1E39"):REM SHOW BUG 7:53 The VIC-20: VAL(TI$) 11:45 Tool Kit: BASIC Explanation 13:40 About the Overflow Error? 39 digits 15:14 VAL() needs a null-terminated string 18:30 Machine Language Monitor time 22:22 Thanks to my patrons and X-Twitter pals!