> On Jan 16, 2021, at 5:32 PM, Paul Koning <paulkon...@comcast.net> wrote:
>
> I just completed a set of tests of David's MFM emulator on my Pro 380.
>
> Summary: everything works right. Very impressive device. My compliments to
> David for an amazing piece of engineering.
>
> Details: ...
Some more details.
1. I forgot to mention that the Pro disk controller always uses only drive
select 1, so that has to be set as the primary drive select on P7, and nothing
on the secondary (P8).
2. RD50s are odd; they use pin 32, which is normally drive select 4, as an
output to indicate "I am an RD50". The software looks for that signal. So to
emulate an RD50, install the jumper for drive select 4 (alongside the one for
drive select 1) on P7.
3. Since on the RD50 drive select 4 is an output, you can't plug one of those
drives into the emulator either for reading or writing, since the emulator
(also) drives that pin. You'd have to open up that wire or something along
those lines to avoid having a battle between two drivers.
paul
