[Coladam] Floppy Drive Controller Chip

Geoff Oltmans oltmansg at bellsouth.net
Wed Nov 16 05:15:04 CET 2011

I've got the old archive of Orphanware firmware from CompuServe still on my machine here. It includes some instructions for adapting drive to work with it. It does require a couple wire mods to the controller board to work (side select), and as Bob points out, a replacement double sided mech with a disk in sensor. I modded one of my old drives with it a while back and it worked fine so far as I could tell.

On Nov 15, 2011, at 9:39 PM, Jim Notini wrote:

> Homefully Bob S. or Rich C. can help with replacement parts, but these 
> drives are getting so scarce that people are holding onto their own 
> defective drives in case they need to raid it for parts.
> I had the same problem with one of my drives back in 1985... reads but does 
> not write (acts like the write-protect tab is on). Fortunately a friend of 
> mine was an electronics wiz and knew that the problem was the 
> photo-electronic cell (looks like an LED light) that is mounted on the left 
> track and lines up (obviously) with the notch in the  5 1/4" disk. Since 
> there were no repair avenues back them and and I had no clue where to get a 
> replacement... he removed the cell from the hole in the track and anytime I 
> needed to write to a disk I simply shinned a flashlight in the hole that the 
> sensor at the bottom of the track would pickup. Fortunately, a couple years 
> later Disk Drive Upgrades/Repairs became available.
> There were a number of upgrades (5 1/4" 320K, 5 1/4" 360K and 3 1/2" 720K), 
> but no one seems to have the upgrade chip available anymore. There were also 
> some other modifications that needed to be done and maybe Bob S. has the 
> info.
> Jim
> ----- Original Message ----- 
> From: "Matthew Hudson" <hexsane at gmail.com>
> To: <coladam at adamcon.org>
> Sent: Tuesday, November 15, 2011 5:38 PM
> Subject: [Coladam] Floppy Drive Controller Chip
>> I'm looking for a replacement drive controller chip. Drive reads but
>> doesn't write and I've traced it back to the 6801 controller chip in the
>> drive. Anyone have one of these anywhere?
>> Were there not upgrade chips available that allowed these drives to be
>> upgraded to a 3.5" floppy drives at one time?
>> -Matt
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