wim at hackbox.be
Wed Nov 17 19:33:26 CST 2010
I'm in the process of restoring a Motorola MEK-6800-D2 evaluation kit.
The kit was adapted and has its RAM on a separate board through an
After putting everything together and verifying that all looks good,
I've applied +5V from an ATX power supply. The '-' prompt appeared, the
JBUG monitor program is working and I even dumped the ROM and some
EPROMs over the cassette port and decoded them on a PC :)
So far so good, but to do anything cool I need the RAM board going. The
problem is that this (custom wire-wrapped board) is using 16 MCM4116
chips. They need also -5V and +12V. Ok, these are available on the ATX
power supply but I'm affraid of doing anything stupid that might blow up
What would you check before applying these additional power levels ?
I've been verifying a bit with an ohm meter that the -5V and +12V leads
are not by accident connected to anything they shouldn't but not sure if
that's a good way.
I also read in the datasheet that you need to apply -5V before the
others and removing it after the others. How would you do that ? I was
thinking on having the -5V and GND permanently connected. So after
switching on the power supply it will have -5V right away. Then manually
connect a additional cable having GND, +5V and +12V. On power off do
the reverse. Is that a good idea ? Not very handy but if it works I'll
live with it.
Thanks for any advice,
hackbox dot be slash museum
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