4 Feb
2000
4 Feb
'00
7:33 a.m.
"In the case of the 1771 and 179x series it's possible to build a really neat
circuit I've seen but never tried to match, which uses the /TEST pin on the
FDC to cause the device to put out its pulses much faster, allowing them to
be accumulated externally in a counter, which, drives a DAC which drives a
VCO, which drives the counter as it downcounts the number of steps, thereby
slewing the head assembly. This could lead to an interesting but lengthy
discussion.
"
Sounds like an ideal candidate for reimplementation in a single chip
microcontroller.