34778Re: [midatlanticretro] S100 Floppy Controller
- Mar 17, 2014A number of posts, suggest that using a UART as a floppy controller in
early microcomputers was various flavors of unnecessary. The facts are,
that early microprocessors came before single-chip floppy controllers,
and floppy drives were around before say the Intel 8080 processor.
Many of the earliest floppy disk controllers - including for and by
IMSAI and MITS Altair - were made from either TTL chips with or without
UARTS, or very early fast microcoded TTL designs, or themselves used the
earliest microprocessors or microcontrollers. And a whole generation of
floppy controllers were hard-sectored, because that was simpler to
manage with such technology.
This is ground I covered a few years ago:
There were a generation of floppy controllers before single-chip FDC's
were available. That was simply the available technology. No shame or
shortchange in that.
Herbert R. Johnson
http://www.retrotechnology.com OR .net
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