kdav11 Posted June 13, 2016 Share Posted June 13, 2016 I just got out my IIc that has been stored for about 20 years. It was working when I put it away, and spent all that time on a closet shelf, covered. I inserted the "An Introduction" disk into the internal drive and turned the computer on. A sparse array of characters (mostly 0's) appears on the screen, and some of them flicker while the drive runs and sounds normal. After a few seconds the message "CHECK DISK DRIVE" appears. I typed CONT-RESET for the cursor and typed PR#7 to activate my external drive. Put the disk in that drive and started up with exactly the same result as for the internal drive. I have a lot of program disks and tried several others with same result on either drive. I disassembled the external drive and cleaned the head with Q-tip and isopropyl alcohol. Also the head mechanism glides smoothly on its rail, and I wiped the rail with the Q-tip. Reassembled and tried again with same result. How can I fix my IIc? Help please. Quote Link to comment Share on other sites More sharing options...
iKarith Posted June 14, 2016 Share Posted June 14, 2016 Sounds like you may have a couple of bad RAM chips. Or perhaps things need to be resocketed? Anyway, this sounds like a bad RAM, and possibly just one bad RAM. That's a cheap repair, but you need to diagnose the problem. Quote Link to comment Share on other sites More sharing options...
Osgeld Posted June 14, 2016 Share Posted June 14, 2016 a box full of disks sitting in an attic or shed doesnt mean the hardware is bad, do you KNOW the disks are good? try making an ADT pro disk from fresh and report back Quote Link to comment Share on other sites More sharing options...
iKarith Posted June 14, 2016 Share Posted June 14, 2016 But crap on the screen when you turn on the machine with any disk in the drive, before the disk loads, suggests bad hardware. Like I said, sounds clearly like a RAM chip is bad, especially if the inverse characters are the same character, and often if that character is @. Quote Link to comment Share on other sites More sharing options...
Tbullet Posted June 20, 2016 Share Posted June 20, 2016 have you tried the self test on the system? http://apple2.wikia.com/wiki/Built-in_Diagnostics. this may help. Quote Link to comment Share on other sites More sharing options...
idr Posted March 17, 2017 Share Posted March 17, 2017 I have a similar issue with my IIc. On boot the drive makes a rapid tapping sound, then displays "CHECK DISK DRIVE". I ran the system check, and it says "System OK". I don't have an external drive to test. Quote Link to comment Share on other sites More sharing options...
Osgeld Posted March 17, 2017 Share Posted March 17, 2017 the rapid tapping is normal Quote Link to comment Share on other sites More sharing options...
thorr Posted March 17, 2017 Share Posted March 17, 2017 I don't think PR#7 works unless you have the one ROM that supports it on the IIc. Quote Link to comment Share on other sites More sharing options...
Nebulon Posted March 17, 2017 Share Posted March 17, 2017 What does the prompt look like? Is it an asterisk? * Quote Link to comment Share on other sites More sharing options...
thorr Posted March 17, 2017 Share Posted March 17, 2017 idr: what you described is normal startup behavior when there is no bootable disk in the drive. Do you have a bootable disk in there, and does it even attempt to start reading it past the initial tapping? Quote Link to comment Share on other sites More sharing options...
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