├OMMODORE COMPUTER SYSTEMS HAVE ALWAYS HAD BUGS AND QUIRKS OF VARYING SEVERITY. ╙OME OF THE QUIRKS MAY AFFECT THE OPERATION WHEN ╘╚┼ ╙┼╥╓┴╬╘ IS IN CHARGE OF OPERATIONS. ╙EVERAL KNOWN BUGS HAS BEEN CIRCUMVENTED IN THE DESIGN OF ╘╚┼ ╙┼╥╓┴╬╘, BUT THEN THERE ARE SOME THAT CAN'T BE PATCHED OVER. ┬ELOW YOU'LL FIND A LIST OF THE BUGS AND QUIRKS KNOWN BY THE AUTHOR THAT YOU MAY ENCOUNTER.
1571 ─╔╙╦ ─╥╔╓┼:
╘HE BUGS APPLY TO THE 128─ PORTABLE (128─ WITH COOLING FAN & CARRYING HANDLE), AND THE STAND-ALONE 1571. ╚OWEVER, UPGRADE ╥╧═'S HAS BEEN RELEASED BY ├OMMODORE TO FIX ALL PROBLEMS.
╞IX ╥╧═S CAN BE ORDERED FROM ╘HE ╟RAVEPINE ╟ROUP (PLEASE REFER TO APPENDIX ╞). ╘HE ├OMMODORE PART NUMBER OF THIS ╥╧═ IS 310654-05. ┘OU CAN ALSO GET YOURSELF THE FIX ╥╧═ BY SENDING AN 27256 ┼╨╥╧═ ALONG WITH THE SAME TURNAROUND FEE AND SHIPPING CHARGE THAT APPLIES FOR ╙┼╥╓┴╬╘ ┼╨╥╧═S. ┴N EVEN BETTER ALTERNATIVE IS ╩IFFY─OS, WHICH FURTHER ENHANCES THE PERFORMANCE OF YOUR SYSTEM (╨LEASE REFER TO APPENDIX ╞).
╨ROBLEMS THAT MAY OCCUR USING "OLD-╥╧═" 1571'S WITH ╘╚┼ ╙┼╥╓┴╬╘:
1) ╥ANDOM "DEVICE NOT PRESENT" ERRORS. ╘╚┼ ╙┼╥╓┴╬╘ MAY GIVE UP AND MAKE A BELL TONE ON THE ═AIN ═ENU OR ABORTING BY DISPLAYING "╔/╧ ERROR" IN THE ─ISK ╘OOLS SECTION.
2) ╙EQUENTIAL FILE CORRUPTION. ╫HEN A SEQUENTIAL FILE USE BLOCKS ON BOTH SIDES OF THE DISK, IT WILL SOMETIMES GET CORRUPTED. ┴FFECTS THE ╞ILE ├OPIER.
4) ╙EVERAL BUGS AFFECTS THE SPEED OF OPERATIONS. ╘HE DISK DRIVE GOES CLICK-CLICK-CLICK FOR A VERY LONG TIME TRYING TO RECOGNIZE SOME DISKS, AND THE DRIVE IS VERY SLOW AT WRITING DATA TO THE BACK SIDE OF THE DISK.
┴ PUBLIC DOMAIN PROGRAM EXIST NAMED "1571.DIAG" WHICH WILL CHECK YOUR DRIVE TO ESTABLISH WHICH TYPE OF ╥╧═ IT CONTAINS.
1581 ─╔╙╦ ─╥╔╓┼:
╘HREE FAULTS ARE KNOWN TO THE AUTHOR:
1) ┴T RARE OCCASIONS, A DISK MAY BECOME SEVERELY CORRUPTED. ╘HIS IS DUE TO THE ╫─1770-00 DISK CONTROLLER CHIP USED IN THE ORIGINAL 1581'S. ╘HIS CONTROLLER WAS LATER REPLACED BY A ╫─1772-00 CHIP WHICH SOLVED THAT PROBLEM. ╔T IS NOT EASY TO REPLACE THE CHIP IF YOU HAVE THE "WRONG" ONE, BECAUSE IT IS SOLDERED IN PLACE. ╔F YOU CHANGE CHIPS, YOU MAY ALSO SHORT JUMPER ╩1 WITH A 47 OHM RESISTOR. ┴LTHOUGH THIS IS NOT ESSENTIAL, IT WILL ALLOW THE DRIVE TO USE THE 6 MS STEP RATE.
2) ╫HEN CREATING A SUB-SUB DIRECTORY (ONE SUBDIRECTORY INSIDE ANOTHER SUBDIRECTORY), THE PARENT DIRECTORY WOULD BE ERASED WHEN THE SUB-SUB DIRECTORY WAS SUPPOSED TO BE FORMATTED. ╔N THE DESIGN OF ╘╚┼ ╙┼╥╓┴╬╘, AN ATTEMPT HAS BEEN MADE TO PATCH UP THE PROBLEM, BUT ╔ HAVEN'T BEEN ABLE TO VERIFY IF IT REALLY FIXES THE PROBLEM. ╨LEASE REPORT IF YOU RUN INTO TROUBLE USING ╘╚┼ ╙┼╥╓┴╬╘'S PARTITION CREATOR MAKING SUB-SUB DIRECTORIES.
3) ╙OME 1581S HAS A POOR SOLDER JOINT ON THE MOTHERBOARD. ╘HIS JOINT IS ON PIN 10 ON DEVICE ╒10. ╔T CAUSES OCCASIONAL "DEVICE NOT PRESENT" ERRORS. ╘╚┼ ╙┼╥╓┴╬╘ MAY GIVE UP AND MAKE A BELL TONE ON THE ═AIN ═ENU OR ABORTING BY DISPLAYING "╔/╧ ERROR" IN THE ─ISK ╘OOLS SECTION.
┴ PROGRAM EXISTS IN THE PUBLIC DOMAIN CALLED "1581.DIAG". ╔T WILL IDENTIFY THE CONTROLLER CHIP AND THE JUMPER ╩1, BUT NOT THE POOR SOLDER JOINT.
1541 ╞╧╥═┴╘╘┼─ ─╔╙╦╙:
╙OME DISKS FORMATTED BY OLD 1541 OR COMPATIBLE DISK DRIVES SEEM TO MALFUNCTION WHEN READ USING A 1571 IN 1571 MODE. ╘HE DISK SEEMS TO SPIN FOREVER. ╘HIS ALSO HAPPENS WITH SOME OLDER ├64 COMMERCIAL PROGRAMS. ╘HE DRIVE WILL RECOGNIZE THE DISK IF ITS LEFT ALONE FOR A WHILE THOUGH, AND THE DELAY MAY REPEAT EVERY TIME THE DISK IS READ. ╘HE DELAY CAN BE ELIMINATED BY SWITCHING YOUR 1571 TO 1541 MODE.
