After standing for 34 years the old score finally beaten, made official at TwinGalaxies. Final frames show required machine settings for "Extreme" mode: 5 lives, no bonuses, Hard difficulty, start on level 9. This record score, of course, doesn't use any bugs or exploits that were discussed in the book. Note, however, that the score in book (189412) wouldn't actually work for the credit exploit. The score must start with 17. Here's the game code in question. ; Apparent anti-piracy provision. If either checksum of the video RAM that ; holds the copyright message is wrong, and the P1 score is 17xxxx, ; increment one.byte of page zero, based on the low two digits of the score. ; See also $b1df and $b27d. loca581: lda copyr_vid_cksum2 ora copyr_vid_cksum1 beq loca593 lda #$17 cmp p1_score_h bcs loca593 ldx p1_score_l inc gamestate,x ; End apparent anti-piracy code
