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BASIC program by James Lowry testing all RAM (0-65535) by POKEing 0 and 255 to each address and PEEKing for defects. Prints defective addresses to LPRINT. Instructions: first PRINT PEEK 23653+256*PEEK 23654 to find the program’s own start address, then substitute it in line 20 to exclude the program from testing. Takes approximately 23 minutes 50 seconds.