Strange problem with Apple IIc Please Help

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MaxTek's picture
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I have an Apple IIc and I can't get the floppy to spin up "unless" I unplug the floppy cable from the floppy drive slightly. When only 2-3 pins are making contact the floppy spins the disk very nicely and the red disk use light comes on. When I have the floppy cable plugged in all the way I can't get the IIc to make the drive do anything.

Any ideas? Thanks.

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speedyG's picture
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Re: Strange problem with Apple IIc Please Help

I'm just speechless what ideas can be performed to destroy CMOS chips.....
speedyG

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gsmcten's picture
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Re: Strange problem with Apple IIc Please Help

Max,

Do you have a spare cable?

Steven Smile

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MaxTek's picture
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Re: Strange problem with Apple IIc Please Help

speedyG wrote:

I'm just speechless what ideas can be performed to destroy CMOS chips.....
speedyG

? Are you saying I destroyed it by removing the cable powered up?

MaxTek's picture
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Re: Strange problem with Apple IIc Please Help

gsmcten wrote:

Max,

Do you have a spare cable?

Steven Smile

No I don't unfortunately.

speedyG's picture
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Re: Strange problem with Apple IIc Please Help

Yep,
by disconnecting that cable you interuppted the groundline....
that is the safest method to destroy a bunch of the CMOS chips....
I'll bet that at least 3 or 4 chips at controller and drive have been destroyed....
spin up of the motor only indicates the connection to the powerlines without control....
speedyG

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In early days I had a lot of money but no time - now I have no money but a lot of time....
the second part includes less friends but a lot more joy on life....

MaxTek's picture
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Re: Strange problem with Apple IIc Please Help

speedyG wrote:

Yep,
by disconnecting that cable you interuppted the groundline....
that is the safest method to destroy a bunch of the CMOS chips....
I'll bet that at least 3 or 4 chips at controller and drive have been destroyed....
spin up of the motor only indicates the connection to the powerlines without control....
speedyG

CMOS chips on the motherboard or floppy drive board?

speedyG's picture
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Re: Strange problem with Apple IIc Please Help

yes... BOTH...

TIP:
it would be usefull to provide better detailed info's
which model of the IIC ? There are beside 3 Versions IIC,IIC+, etc. also 4 Rveisions....
Picture of the Mainboard ? The reason is also to detect mods....

At the simple IIC the drive has a souple of similarities with the Disk II drive....(MC3470 )
And at the different Models and revisions there are different chips used on the mainboard....

Do you also have alternate a AppleII+ Rev. RFI with Disk II Contoller ?

speedyG

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In early days I had a lot of money but no time - now I have no money but a lot of time....
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MaxTek's picture
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Re: Strange problem with Apple IIc Please Help

I will get some pics uploaded. I do not have any extra parts. My basement is filled with Apple stuff but it starts with the 128k and above.

MaxTek's picture
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Re: Strange problem with Apple IIc Please Help

Decided to toss it in the garbage. Not worth my trouble. I prefer Mac OS. Thanks everyone for your help.

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Re: Strange problem with Apple IIc Please Help

Hi MaxTek - The keyboard, case, and chips in that IIC have value. You could easily get $40 just for the keyboard and probably $30 for the case

gsmcten's picture
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Re: Strange problem with Apple IIc Please Help

Hunter,

$40.00 for a IIc Case?

What planet are you on?

Steven Smile

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