18 May
2006
18 May
'06
1:32 p.m.
On 5/18/2006 at 6:55 PM Pete Turnbull wrote:
Not quite, what Chuck means is that most MFM drives
after the ST506
have a slightly different interface, and should buffer the step pulses,
and internally it will ramp up the step rate and ramp down again -- it
can step faster once it gets going, than it can if it comes to a stop
between pulses.
Just a tidbit somewhat OT--I own a 5.25" floppy drive with buffered seek.
It's a Micropolis that still uses a leadscrew positioner long after most
other manufacturers had gone to alternatives like taut-band. When a seek
is initiated, it de-asserts READY until the seek is complete.
It uses a house-numbered MCU in a 40 pin DIP made by MOS Technology. The
clamping arrangement is somewhat unique--when the drive door is opened, the
positioner and drive motor are attached to a die-cast subassembly that
pivots to open.
Cheers,
Chuck