[comp.sys.misc] When is S-100 NOT S-100

mknox@EMX.UTEXAS.EDU (Margaret H. Knox) (05/22/88)

My thanks to Mr. Peter Collins (whose reply to me bounced across half
the hosts in the US) for pointing out the reason for the *CAUTION*
on the S-100 cards in an Ithaca ENCORE system.

S-100 systems normally put out filtered (but unregulated) voltage
on the power lines (for instance, > 7 volts DC for VCC).  This is
then regulated on each S-100 card, distributing the heating and 
allowing the use of the small 1 - 3 amp 7805-type regulators.  The
ENCORE regulates the voltages AT THE POWER SUPPLY.  The boards are
standard S-100, but the place for the regulators are bypassed (shorted
across)

As Mr. Collins points out:  Put an ENCORE card in a normal S-100 chassis
and it will make fireworks!