Re: Interesting Disk controller variant

["Ernst" <news2010@online.de>]

Wayne Stewart wrote:

> Was looking through some Apple II stuff I picked up a couple of weeks
> ago and found an interesting disk controller card variant. Just used a
> couple of 2716 EPROMs instead of the usual PROMS.
> http://picasaweb.google.com/waynejstewart/AppleIIPics#5506539564093358258

A long time ago, I saw a similar controller card. I didn't work
reliably, especially at higher temperatures. It turned out that
the EPROM used to implement the state machine wasn't fast enough.
But, at that time, an EPROM fast enough to work in this application
was too expensive to fix the problem, so I considered this type
of controller card broken by design.