ingoldsby@calgary.UUCP (Terry Ingoldsby) (12/17/86)
Regarding the current discussion on adapting old
CoCo Disk Controllers to work with the newer (CoCo2 and 3)
machines that lack the +12v supply (needed by old
controllers), I came across an interesting advertisement
in an electronics supply catalog. As you know, the
old disk controllers use the WD1793 controller chip.
It is the device that requires the +12 volts. The
following is an extract from a `Standard Microsystems Corp'
advertisement:
Our FDC 1791, FDC 1793, FDC 1795 and FDC 1797
are the current industry-standard floppy disk
controllers. Our FDC 9791, FDC9793, FDC9795
and FDC9797 provide the same popular parts,
but eliminate the need for a 12-volt power
supply.
Does anyone know anything about these devices? If they
are pin compatible with the WD1793, and the price is
not exorbitant, it might be possible to upgrade the old
controllers my substituting the FDC9793 for the WD1793
chip. Could life be this simple?
Terry Ingoldsby
....ihnp4!alberta!calgary!ingoldsby