Apple IIe and II Plus Disk II Issue

[Apple IIe and II Plus Disk II Issue]

So some good news. By replacing the four chips on each Disk II fixed the problem on both the drives. FYI the Apple II controllers were undamaged in this incident.

 

Thanks for everyone's help! It was worth the trouble just to learn that ADTPro existed, and I see that Dave is the author. Wow. Thanks again David!

 

This week I dusted off my Apple II's which have been dormant. The Apple II Plus was my first computer in 1983 and I had moved to the Mac by 1987. It is really fun to get back with my first love!

 

One final question is if there is a way to salvage a few disks that had sector zero overwritten? Thanks, Joe

[Apple IIe and II Plus Disk II Issue]

I have decided to replace the four chips on the Disk ll controllers. I found the Apple Disk ll tech document and that is what it oulines in the troubleshooting. I will report my results.

[Apple IIe and II Plus Disk II Issue]

So I could blow the good drive hooking it to one of the suspect controller cards, correct? Lovely!

[Apple IIe and II Plus Disk II Issue]

Hi, yes I am connecting ribbon cables correctly. And the init hello,d2 gave same error. I am guessing it is not the controller so i bought a disk 2 off ebay that is listed as tested and works. Will try that hopefully by end of the week and report back. Thanks again.

[Apple IIe and II Plus Disk II Issue]

ok, another update. Using ADTpro (thanks David, was not aware it existed) I got DOS on the //e and now get the message DISK ERROR I/O when I try a CATALOG or INIT HELLO command.

 

I tried this using both the controller cards and both drives. Does this error point at the drive or the interface card? No visible signs of damage (chips or capacitors) on the cards or the drives. I read that this could be the MC3470 chip on the drive?

 

Thoughts anyone? Thanks!

[Apple IIe and II Plus Disk II Issue]

Update. I was able to obtain the correct chip locally this morning and swapped it in both my Disk II drives. One of the chips showed damage, one did not. Now when i try to boot I am getting the same issue. Perhaps it is because I have a bad disk? Would the sector 0 issue demonstrate the same issue? Disk II drive makes a normal boot sound, it display the Apple II symbol and the disk spins but nothing happens.

 

Thanks again for everybody's help!

[Apple IIe and II Plus Disk II Issue]

I did clean the heads. I think it is the chip because the issue started when I swapped the drives. Anyone know of a source for a 74LS125 IC in Atlanta? I googled this issue more directly and that is the chip that blows if you misalign the ribbon cable.

[Apple IIe and II Plus Disk II Issue]

Thanks. I don't have a way to test further and would like to replace the chips. What chip is it and where could I obtain them?

 

Thanks again!

[Apple IIe and II Plus Disk II Issue]

Hi, I have an Apple IIe and a II Plus which were working and now are not booting software. I have been using both and to do that required sharing two Disk II drives between them. I am now afraid I fried something when I swapped the drives. FYI I always had the power off and the power cable disconnected when I moved the drives one one system to another. Perhaps static fried a chip?

 

Symptom on both systems is that when I turn them on to autoboot the Disk II drive makes a normal boot sound, it display the Apple II symbol and the disk spins, but nothing happens. Have tried this with multiple disks. If I do a reset the disk stops spinning. Also, if I manually do a IN#6 it will do the same thing. One weird symptom is if the Disk II card is in any of the slots it will attempt to boot, which i thought was only supposed to happen if the card was in slot #6. I have two Disk II cards and they are doing the same thing.

 

I am baffled.

 

Any help appreciated.

 

Joe