anyone seen this 1541c mod, external potentiometer

[discgolfer72]

guy came in the shop today with a bunch of stuff and this 1541c was one

 

 

ive seen the mod to switch drive numbers

but why would this have a potentiometer on it

? drive speed adjustment

 

must have been doing some crazy stuff since they added that huge cooling unit on top lol

 

 

have not had a chance to pop it open yet (still sorting the lot ) but once I'm caught up ill get some internal pics

[+OLD CS1]

Yeah, my guess is to adjust drive speed. Any idea to what that potentiometer is connected?

[discgolfer72]

Yeah, my guess is to adjust drive speed. Any idea to what that potentiometer is connected?

hmmm interesting

 

any info on that RAMBOard by chip level designs 1988

 

didn't probe any further but the wire goes under the drive and looks like it does go to the drive motor

 

 

hmmm even more interesting

http://d81.de/CLD-RAMBOard/History.shtml

EDIT

 

also looks like the cooling unit is actually the sidecar cooler from a apple //e

Edited January 24, 2018 by discgolfer72

[Zippy Zapp]

Several of the disk copiers then relied on a certain drive speed to copy specific titles. SuperCard needed a specific speed as did others that supported RAMBoard. Maverick came with a flyer that you could order a drive speed controller that looked exactly like that. Quite handy if you were duplicating some hard to copy disks.