┴S ITS NAME IMPLIES, THIS WILL SWITCH THE COMPUTER TO 64 MODE, SIMILAR TO ╟╧64 IN ┬┴╙╔├. ┘OU WILL BE ASKED TO CONFIRM BEFORE THE ACTION IS ACTUALLY PERFORMED. ╚OWEVER, ╘╚┼ ╙┼╥╓┴╬╘ USES A SLIGHTLY DIFFERENT APPROACH WHEN SWITCHING THE COMPUTER TO 64 MODE. ╔F YOU'RE NOT TECHNICAL MINDED, YOU CAN JUST SKIP THE REST OF THIS EXPLANATION. ┘OU WILL PROBABLY NOT BE ABLE TO DETECT THE DIFFERENCE.
╔F YOU'RE A PROGRAMMER, THIS FEATURE MAY OPEN SOME INTERESTING POSSIBILITIES. ┴S YOU KNOW, THE 128 HAS TWO DISTINCT SEGMENTS OF ╥┴═ MEMORY OF 64╦ EACH CALLED ┬┴╬╦S. ┬┴╙╔├ USES ONE BANK (BANK 0) TO STORE SYSTEM VARIABLES, VECTORS, PROGRAMS AND HIGH RESOLUTION SCREENS AMONG OTHER THINGS, AND THE OTHER (BANK 1) TO STORE ┬┴╙╔├ VARIABLES. ╬ORMALLY, WHEN YOU ENTER ╟╧64 IN ┬┴╙╔├ OR RESET THE COMPUTER WHILE HOLDING DOWN THE ├= KEY, THE COMPUTER WILL SET UP 64 MODE TO WORK IN BANK 0, AND BANK 1 WILL BE UNACCESSIBLE ENTIRELY AS LONG AS YOU STAY IN 64 MODE. ╘╚┼ ╙┼╥╓┴╬╘ HOWEVER, SETS UP 64 MODE IN BANK 1. ╘HIS IS ALSO TRUE WITH ALL OTHER FEATURES IN ╘╚┼ ╙┼╥╓┴╬╘ THAT SWITCHES THE COMPUTER TO 64 MODE.
╙O WHAT? ╫ELL, USING BANK 1 DOES HAVE A QUITE SIGNIFICANT ADVANTAGE: ┘OU CAN RUN 64 MODE ═╠ OR ┬┴╙╔├ PROGRAMS AS USUAL. ╘HEN, YOU CAN RESET THE COMPUTER, AND EXAMINE THE ENTIRE MEMORY FROM $0400 TO $FEFF WITH THE MONITOR WITHOUT CORRUPTION. ╙CREEN MEMORY, ╥┴═ UNDER ╥╧═ & ╔/╧ WILL BE INTACT. ╘HEN YOU CAN USE ╟╧ 64 FROM THE MENU TO RETURN TO 64 MODE, AGAIN WITHOUT CORRUPTION (SCREEN MEMORY WILL BE CORRUPTED OF COURSE, BECAUSE THE SCREEN IS CLEARED IN THE PROCESS).
╔ HAVE EVEN MORE IN MY SLEEVE. ╚OLD DOWN ╙╚╔╞╘ WHEN YOU SELECT ╟╧ 64, AND A ┬┴╙╔├ PROGRAM WON'T EVEN BE ╬┼╫-ED, EVEN VARIABLES WILL BE INTACT! ┼VEN UTILITIES WILL STILL BE WORKING! ┘EP, SEE FOR YOURSELF. ╘HE ONLY EXCEPTIONS ARE SOME UTILITIES WHICH DEPEND ON PRE-SET CONDITIONS IN THE ╔/╧ AREA (SPRITES FOR EXAMPLE). ┘OU CAN RUN PROGRAMS IN 128 MODE WHILE PRESERVING 64 MODE MEMORY, PROVIDED THEY DON'T CORRUPT BANK 1 MEMORY. ╥UNNING 128 ┬┴╙╔├ PROGRAMS IS ALSO POSSIBLE IF YOU CHANGE THE VARIABLE AREA. ╨╧╦┼48,160:├╠╥ WILL PROTECT THE 64 MODE ┬┴╙╔├ AREA, LEAVING 24╦ FOR VARIABLES IN 128 MODE. ╔F YOU WISH TO PROTECT THE 49152 ($├000) AREA AS WELL, USE ╨╧╦┼ 48,224:├╠╥, LEAVING NEARLY 8╦ OF VARIABLE SPACE. ╘HE SECRET BEHIND THIS SPECTACULAR FEATURE IS THAT THE LOWEST 1╦ OF THE 64 MEMORY WHICH CONTAINS ALL IMPORTANT POINTERS AND VECTORS IS SAFE UNDER THE 1╦ COMMON AREA WHICH IS COMPLETELY INACCESSIBLE IN 128 MODE WITHOUT THE USE OF SOME ═╠ TRICKERY. ╨LEASE NOTE THAT THE COMPUTER WILL CRASH (IF USING ╙╚╔╞╘/9) UNLESS YOU HAVE ALREADY BEEN IN 64 MODE AT LEAST ONCE SINCE THE COMPUTER WAS POWERED UP.
╘O BE ABLE TO EXPLOIT THIS FEATURE YOU MUST BE CAREFUL ON HOW YOU ENTER 64 MODE: ┘OU SHOULD ALWAYS ENTER 64 MODE BY USING ONE OF ╘╚┼ ╙┼╥╓┴╬╘'S FEATURES. ╘╚┼ ╙┼╥╓┴╬╘ WILL ALWAYS DROP YOU INTO BANK 1. ╧N THE OTHER HAND, USING ╟╧64 FROM ┬┴╙╔├, RESETTING THE COMPUTER WHILE HOLDING DOWN THE ├= KEY OR BOOT SOFTWARE WHICH AUTOBOOTS INTO 64 MODE (AS MANY GAMES DO), THE COMPUTER WILL USE BANK 0 AS PER NORMAL PRACTICE.
