On Fri, 29 Jan 2010 10:21:55 -0500, JW wrote:


Usually shorting TTL outputs to GND won't hurt anything. Since the HALT
pin can also be an output from the 68K there's probably one or more open
collector devices driving this pin. As long as it's not tied to +5, I
doubt shorting to GND would hurt anything. To be even safer, you could try
a 100 ohm resistor if the 1K doesn't work, then try shorting to GND if the
pin is not tied to +5.

Thanks, worked a treat. :-)