┴NDREW ═ILESKI'S DESIGN FOR THE EXPANDED ╥AM ┼XPANSION ╒NIT HAS ADDED ENORMOUSLY TO THE POWER OF THE ├OMMODORE 64 AND 128 COMPUTERS. ╫ITH A 17XX ╥┼╒ EXPANDED TO AS MUCH AS 2 ═EGABYTES, PROGRAMMERS WHO MAKE USE OF ─IRECT ═EMORY ┴CCESS OPERATIONS CAN TAKE COMMAND OF A VAST STORAGE AREA.
╒SERS OF THE ╟┼╧╙ OPERATING SYSTEM CAN ALSO TAKE ADVANTAGE OF THE EXPANDED ╥┼╒, WHICH BECOMES EVEN MORE USEFUL WHEN COMBINED WITH ╩IM ├OLLETTE'S ├ONFIGURE 2.1, A MODIFICATION OF THE ╟┼╧╙ ├ONFIGURE 2.0, ALLOWING FOR A ╥AM─ISK EMULATION OF THE ├OMMODORE 1581 DRIVE.
╚OWEVER, ├OMMODORE'S ╥┴═─╧╙ CANNOT ACCESS THE ADDED ╥┴═ IN THE EXPANDED ╥┼╒. ╥┴═┬╧╙╙ IS A MODEST ADDITION TO THE SOFTWARE LIBRARY, WHICH ENABLES USERS OF ├┬═ (├OMMODORE) ╥┴═─╧╙ AND ╟┼╧╙ TO USE THE EXPANDED ╥┼╒ IN A NEW WAY.
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╥┴═┬╧╙╙ ALLOWS AN EXPANDED ╥┼╒ TO CONTAIN MORE THAN ONE ╥AM─ISK AT A TIME. ╧NLY ONE ╥AM─ISK CAN BE ACTIVE. ╘HE OTHERS, ONE FOR EACH 512╦ OF EXPANDED ╥┴═, ARE STORED AND CAN BE QUICKLY RECALLED. ┴NY COMBINATION OF ├┬═ ╥┴═─╧╙ ╥AM─ISKS AND ╟┼╧╙ ╥AM CONFIGURATIONS CAN BE STORED. ╚OWEVER, ╥┴═┬╧╙╙ MAY NOT BE ABLE TO HANDLE ╟┼╧╙ ╥AM CONFIGURATIONS THAT EXCEED THE 512╦ OF AN UNEXPANDED 1750 ╥┼╒. ╙EE THE SECTION ON "├AUTIONS," BELOW.
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┴ ╥AM ┼XPANSION ╒NIT IS ORGANIZED IN BANKS OF 64╦. ╘HE 1750 CONTAINS EIGHT SUCH BANKS, NUMBERED 0-7. ┴N EXPANDED ╥┼╒ HAS EIGHT ADDITIONAL BANKS OF ╥┴═ FOR EACH HALF-═EG OF MEMORY ADDED, SO A 2-═EG ╥┼╒ CONTAINS BANKS 0-31.
┼VEN AN EXPANDED ╥┼╒ SEES ONLY EIGHT BANKS OR 512╦ AT A TIME. ╫HEN USING ─═┴ OR ╟┼╧╙, THE ╥┼╒ SWITCHES QUICKLY FROM ONE GROUP OF EIGHT BANKS TO ANOTHER, SO THE ENTIRE EXPANDED ╥┼╒ CAN BE ACCESSED.
╥┴═┬╧╙╙áCOPIES DATA FROM BANKS 0-7 AND STORES IT IN ONE OF THE OTHER 512╦ AREAS IN THE ╥┼╒, FROM WHICH IT CAN BE QUICKLY RETRIEVED OR SWAPPED WITH THE CURRENT CONTENTS OF BANKS 0-7. ─ATA IS READ FROM THE ╥┼╒ INTO ├64 MEMORY AND THEN WRITTEN TO THE NEW ╥┼╒ LOCATION IN BLOCKS OF 32╦. ╘HE COMPLETE OPERATION, INVOLVING 16 PASSES, TAKES ABOUT THREE SECONDS.
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╠ET'S ASSUME YOU'VE BEEN USING A ├┬═ ╥AM─ISK. ╬OW YOU WANT TO USE YOUR ╥┼╒ FOR SOME OTHER PURPOSE: MAYBE A DIFFERENT ├┬═ ╥AM─ISK, MAYBE A ╟┼╧╙ ╥AM─ISK, OR PERHAPS YOU'RE USING A DISK OR FILE COPIER, SUCH AS ═AVERICK OR ╙UPER ╙NAPSHOT, WHICH USES THE ╥┼╒ AS A BUFFER. ┬UT YOU WILL WANT TO RETURN TO THE CURRENT ╥AM─ISK LATER, AND WOULD RATHER NOT HAVE TO GO THE PROCESS OF COPYING ALL FILES TO THE ╥AM─ISK AGAIN. ╥┴═┬╧╙╙ IS JUST WHAT YOU NEED!
╞IRST OF ALL, ┬┴├╦ ╒╨ ┴╠╠ ╔═╨╧╥╘┴╬╘ ╞╔╠┼╙ ╘╧ ┴ ╨╚┘╙╔├┴╠ ─╔╙╦! ┘OU CAN USUALLY DEPEND ON ╥┴═┬╧╙╙, PROVIDED YOU DON'T HAVE A POWER FAILURE. ┬UT FOR SAFETY'S SAKE, VIEW ╥┴═┬╧╙╙ AS A CONVENIENCE, NOT A SECURE BACKUP!
╙INCE YOUR ╥┼╒ IS PROBABLY IN 1750 EMULATION MODE, FLIP THE SWITCH TO TOGGLE IT TO EXPANDED MODE. ╥ESET THE COMPUTER, IF YOU HAVE A RESET BUTTON.
╬OW LOAD AND RUN ╥┴═┬╧╙╙. ┴NSWER THE PROMPT ASKING FOR THE SIZE OF YOUR EXPANDED ╥┼╒.
╥┴═┬╧╙╙ WILL TAKE A FEW SECONDS TO EXAMINE EACH OF THE 512╦ AREAS IN YOUR ╥┼╒. ╔T WILL THEN DISPLAY THE CURRENT CONFIGURATION. ╥┴═┬╧╙╙ CAN RECOGNIZE ├┬═ ╥AM─ISKS AND ╟┼╧╙ CONFIGURATIONS, AND IT WILL REPORT WHAT IT FINDS CURRENTLY ACTIVE IN BANKS 0-7 AS WELL AS IN THE STORAGE AREAS OF EXPANDED ╥┴═. ╫HEN IT FINDS A ╟┼╧╙ CONFIGURATION, IT WILL ALSO REPORT ANY DRIVES THAT ARE CONFIGURED IN ╥┴═. ┴ SHADOWED 1541 WILL APPEARS AS "╙1541", WHILE A ╥┴═ 1571 WILL BE "╥1571". ╔F ╥┴═┬╧╙╙ FINDS NO EVIDENCE OF ╟┼╧╙ OR ├┬═ ╥AM─OS, IT WILL REPORT THE AREA AS "UNKNOWN." ╔F, AS SOMETIMES HAPPENS, IT FINDS BOTH ╟┼╧╙ AND ├┬═ MARKERS, IT WILL REPORT "CONFUSED" AND WILL NOT ANALYZE THE ╟┼╧╙ ╥┴═ DRIVES.
┘OU THEN HAVE THREE OPTIONS: STORE, RETRIEVE, OR SWAP. ╘HE USE OF THE THREE COMMANDS SHOULD BE FAIRLY OBVIOUS. "╙TORE" CREATES A COPY OF BANKS 0-7 IN A HIGHER 512╦ AREA, BUT DOES NOT DISTURB BANKS 0-7. "╥ETRIEVE" COPIES A HIGHER AREA TO BANKS 0-7, WITHOUT MODIFYING THE HIGHER AREA. "╙WAP" MOVES THE CONTENTS OF BANK 0-7 TO A HIGHER AREA, AND PUTS WHATEVER WAS IN THE HIGHER AREA INTO BANKS 0-7.
┴FTER YOU SELECT THE OPERATION TO BE PERFORMED, IF YOU HAVE A 1.5 OR 2 ═EG ╥┼╒, YOU WILL BE ASKED WHICH STORAGE AREA SHOULD BE USED. ┴NSWER THAT PROMPT, AND THE OPERATION IS PERFORMED. ┘OU CAN THEN QUIT, OR GO BACK AND VIEW THE NEW CONFIGURATION.
╫HEN FINISHED USING ╥┴═┬╧╙╙, YOU PROBABLY NEED TO SWITCH THE ╥┼╒ BACK TO 1750 MODE AND RESET THE COMPUTER IF YOU CAN. ┘OU CAN NOW PROCEED AS THOUGH THE NEWLY-RESTORED CONTENTS OF THE ╥┼╒ HAD BEEN THERE ALL ALONG: REBOOT ╥┴═─╧╙, LOAD THE ╟┼╧╙ ╥BOOT, OR WHATEVER.
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╥┴═┬╧╙╙ SEEMS TO BE VERY RELIABLE WHEN DEALING WITH CONFIGURATIONS THAT USE THE ╥┼╒ AS A STANDARD 1750. ╘HIS INCLUDES ├┬═ ╥AM─OS. ╟┼╧╙ IS ANOTHER MATTER.
╫HEN USING ╟┼╧╙ WITH AN ╥┼╒, WE ARE NOT JUST DEALING WITH A ╥AM─ISK, WE ARE CONCERNED WITH THE ENTIRE SYSTEM CONFIGURATION, WHICH MAY INCLUDE ALMOST ANY COMBINATION OF ╥AM─ISKS AND SHADOWED DISKS. ╫E CAN USE ╥┴═┬╧╙╙ WITH CONFIDENCE ONLY IF WE KEEP THE ╥┼╒ IN 1750 MODE WHILE USING ╟┼╧╙.
┬UT WHERE'S THE FUN IN THAT? ╫HY LIMIT OURSELVES TO A ╥┴═/SHADOWED 1571 (OR TWO ╥┴═/SHADOWED 1541'S) AND A SHADOWED 1581 DIRECTORY, WHEN WE COULD ENJOY THE POWER OF A ╥┴═ 1581?
╔N FACT, IF YOU HAVE A 1.5 OR 2 ═EG ╥┼╒, YOU MAY BE ABLE TO USE A ╥┴═ 1581 DRIVE AND OTHER ╟┼╧╙ ENHANCEMENTS THAT MAKE USE OF THE EXPANDED ╥┼╒, AND STILL USE ╥┴═┬╧╙╙. ┬UT YOU HAVE NO ASSURANCE THAT IT WILL WORK EVERY TIME.
╔ HAVE BEEN USING ╟┼╧╙ WITH A ╥┴═ 1581 DRIVE, ALTERNATING WITH A ├┬═ ╥AM─ISK CONTAINING THE SPELLCHECKING DICTIONARY FOR ╘HE ╫RITE ╙TUFF. ╘HE ├┬═ ╥AM─ISK IS STORED IN THE HIGH STORAGE AREA IN MY 2 ═EG ╥┼╒ (BANKS 24-31). ╔ STORE THE ╟EOS CONFIGURATION IN THE MIDDLE STORAGE AREA (BANKS 16-23). ╘HE LOW STORAGE AREA MUST BE LEFT UNTOUCHED; IT HOLDS THE REST OF THE ╥┴═ 1581.
╘HIS CONFIGURATION WORKS MOST OF THE TIME. ╔ HAVE HAD A FEW CRASHES, AND FREQUENTLY WHEN ╔ REBOOT ╟EOS ╔ HAVE TO RESELECT THE MOUSE INPUT DRIVER. ╔ ALWAYS VALIDATE THE ╥AM─ISK AS SOON AS ╔ REBOOT; THIS WILL REVEAL MANY OF THE POSSIBLE PROBLEMS.
╘HE FACT IS THAT ╟┼╧╙ DOES NOT NECESSARILY USE THE ╥┼╒ AS YOU WOULD EXPECT IT TO. ╔F IT KNOWS THAT EXPANDED ╥┴═ IS PRESENT, IT USES IT. ╔T MAY WRITE DATA TO HIGH EXPANDED ╥┴═, WHERE IT MAY CONFLICT WITH A STORED ╥AM─ISK.
╘HE COMBINATION OF ╥┴═┬╧╙╙ WITH A ╟┼╧╙ CONFIGURATION THAT USES EXPANDED ╥┴═ IS RISKY. ╒SE IT WITH CAUTION AND A SENSE OF EXPERIMENTATION. ╔F IT WORKS, ENJOY IT! ┬UT AS ALWAYS, ┬┴├╦ ╒╨ ┴╬┘ ╔═╨╧╥╘┴╬╘ ╞╔╠┼╙ ╘╧ ┴ ╨╚┘╙╔├┴╠ ─╔╙╦!
╦EEP IN MIND THAT ╟┼╧╙ RESERVES BANK 0 FOR THE ├ONFIGURE FILE AND ╦ERNAL. ┴ ╥┴═ 1581 DRIVE OCCUPIES 13 BANKS, A ╥┴═/SHADOWED 1571 TAKES 6 BANKS, A ╥┴═/SHADOWED 1541 NEEDS 3 BANKS, AND A 1581 SHADOWED DIRECTORY USES 1 BANK. ┴VOID ANY CONFIGURATION THAT OBVIOUSLY WOULD EXTEND INTO THE ╥┼╒ AREAS HOLDING NON-╟┼╧╙ DATA. ╫HILE ╟┼╧╙ IS ACTIVE, YOU CAN OVERWRITE THE AREA YOU USE TO STORE THE BOTTOM 512╦ OF YOUR ╟┼╧╙ CONFIGURATION, BUT BEFORE EXITING TO ┬┴╙╔├, YOU SHOULD RECONFIGURE SO THAT THIS AREA IS NOT USED. ╘HEN HOPE FOR THE BEST!
├╧╬╞╒╙┼─ ┴╥┼┴╙: ╔F ╥┴═┬╧╙╙ REPORTS THAT AN AREA IS "CONFUSED," THAT MEANS IT FOUND BOTH A ├┬═ ╥AM─ISK AND A ╟┼╧╙ CONFIGURATION IN THE SAME AREA! ╘HIS MAY HAPPEN WHEN YOU INITIALIZE A ├┬═ ╥AM─ISK WHERE THERE WAS PREVIOUSLY A ╟┼╧╙ CONFIGURATION. ┘OU CAN USUALLY REBOOT ├OMMODORE ╥┴═─╧╙ WITH NO PROBLEM.
╔F YOU HAVE NOT COPIED MANY FILES TO THE ├┬═ ╥AM─ISK, YOU MAY ALSO BE ABLE TO REBOOT ╟┼╧╙! ┘OU CAN EXPECT SOME PROBLEMS, BUT IF YOU FOOLISHLY FORGOT TO BACKUP IMPORTANT FILES, YOU MAY BE ABLE TO RECOVER SOME OF THEM BY REBOOTING ╟┼╧╙ IN A "CONFUSED" AREA.
├╧═╨┴╘╔┬╔╠╔╘┘
╥┴═┬╧╙╙ IS A ┬┴╙╔├ 2.0 PROGRAM FOR THE ├OMMODORE 64. ├128 USERS MUST SWITCH TO ├64 MODE IN ORDER TO USE IT. ╔T HAS BEEN TESTED WITH A ├64 AND A 1764 ╥┼╒ EXPANDED TO 2 ═EGABYTES. ╔T SHOULD BE FULLY COMPATIBLE WITH ALL 17XX ╥┼╒S EXPANDED TO 1, 1.5 OR 2 ═EG.
╥┴═┬╧╙╙ WILL RECOGNIZE ├┬═ ╥AM─ISKS CONFIGURED WITH VERSIONS 3.2, 3.3, AND 4.2 OF ╥┴═─╧╙ FOR THE ├64. ╔T HAS NOT BEEN TESTED WITH OTHER VERSIONS, OR WITH THE ├128 VERSIONS.
╥┴═┬╧╙╙ WILL ALSO RECOGNIZE ╟┼╧╙ CONFIGURATIONS GENERATED BY ╟┼╧╙ ├64 2.0 (├ONFIGURE 2.0 OR 2.1). ╔T HAS NOT BEEN TESTED WITH ╟┼╧╙ ├128, BUT SHOULD BE COMPLETELY COMPATIBLE.
╒SERS WHO ENCOUNTER COMPATIBILITY PROBLEMS (OR ANY OTHER PROBLEMS) ARE INVITED TO POST COMMENTS OR SEND ┼-MAIL TO THE ╤-╠INK UPLOADER, ═UMBLES.
╘╚┴╬╦╙ ╘╧: ┴NDREW ═ILESKI (╥ECURSION) FOR INVENTING THE EXPANDED ╥┼╒, ╩IM ├OLLETTE (╟EO╥EP ╩IM) FOR HIS NUMEROUS SOFTWARE ENHANCEMENTS AND HIS ADVICE ON THIS PROJECT, TO ═ICHAEL╙30 FOR HIS ADVICE, AND TO ╥AYMOND ─AY (╥AYMOND─2) FOR HIS EXCELLENT AND AFFORDABLE ╥┼╒ EXPANSION, AND TO MY WIFE FOR NOT ASKING TOO MANY QUESTIONS ABOUT WHAT ╔'M REALLY DOING WITH THE COMPUTER UNTIL 3:00 MOST MORNINGS.
├╧══╧─╧╥┼, ├┬═, ╟┼╧╙, ═┴╓┼╥╔├╦, AND ╙╒╨┼╥ ╙╬┴╨╙╚╧╘ ARE ALL REGISTERED TRADEMARKS, AND ARE USED IN THIS ARTICLE TO REFER TO SPECIFIC PRODUCTS MADE BY THE MANUFACTURERS WHO HOLD THESE TRADEMARKS.
╘HIS TEXT AND THE PROGRAM IT DESCRIBES ARE ENTIRELY IN THE PUBLIC DOMAIN, AND MAY BE FREELY COPIED, DISTRIBUTED, MODIFIED, AND SOLD. ╘HE AUTHOR RESERVES THE RIGHT TO PUBLICLY DENOUNCE ANY PERSON WHO MAKES MINOR MODIFICATIONS AND CLAIMS THE WORK AS ENTIRELY HIS OWN.
