are there modern motherboards with ISA slots for *AMD*processors?

On Aug 25, 2:51*pm, daytripper wrote:
On Tue, 25 Aug 2009 04:26:41 -0400, Paul wrote:

[...]I notice arstech also mentions powering, and I notice in the pinout
for the ISA connector, there is a pin available for -5V. On modern ATX
power supplies, -5V has been removed, and you'd find one pin on
the ATX connector that is not being used. That would be where the
-5V used to be. Now, there isn't a strong reason to be using
that rail. It might be convenient for something like wiring up ECL
chips. Or perhaps some of the really old DRAM technologies. So that might
be an item to check as well.

[...]

Back in the day, the -5V was often used in UARTs. If the OP's custom card is
*that* old and relies on serial communication devices that are not single,
positive input voltage, that could be a problem requiring resolution...


.... not too hard to provide the -5v from a regulated wallwart though,
if necessary


NT

On Wed, 26 Aug 2009 13:02:11 -0700 (PDT), NT wrote:

On Aug 25, 2:51*pm, daytripper wrote:
On Tue, 25 Aug 2009 04:26:41 -0400, Paul wrote:

[...]I notice arstech also mentions powering, and I notice in the pinout
for the ISA connector, there is a pin available for -5V. On modern ATX
power supplies, -5V has been removed, and you'd find one pin on
the ATX connector that is not being used. That would be where the
-5V used to be. Now, there isn't a strong reason to be using
that rail. It might be convenient for something like wiring up ECL
chips. Or perhaps some of the really old DRAM technologies. So that might
be an item to check as well.

[...]

Back in the day, the -5V was often used in UARTs. If the OP's custom card is
*that* old and relies on serial communication devices that are not single,
positive input voltage, that could be a problem requiring resolution...


... not too hard to provide the -5v from a regulated wallwart though,
if necessary

Well, other than cobbling up some way to connect that wall-wart to the
internally located card, there's also the potential problem of power rail
sequencing during power-up/power-off cycles, if any of the multi-voltage parts
are sequence-sensitive...

Cheers

On Aug 27, 2:12*pm, daytripper wrote:
On Wed, 26 Aug 2009 13:02:11 -0700 (PDT), NT wrote:
On Aug 25, 2:51*pm, daytripper wrote:
On Tue, 25 Aug 2009 04:26:41 -0400, Paul wrote:

[...]I notice arstech also mentions powering, and I notice in the pinout
for the ISA connector, there is a pin available for -5V. On modern ATX
power supplies, -5V has been removed, and you'd find one pin on
the ATX connector that is not being used. That would be where the
-5V used to be. Now, there isn't a strong reason to be using
that rail. It might be convenient for something like wiring up ECL
chips. Or perhaps some of the really old DRAM technologies. So that might
be an item to check as well.

[...]

Back in the day, the -5V was often used in UARTs. If the OP's custom card is
*that* old and relies on serial communication devices that are not single,
positive input voltage, that could be a problem requiring resolution....

... not too hard to provide the -5v from a regulated wallwart though,
if necessary

Well, other than cobbling up some way to connect that wall-wart to the
internally located card, there's also the potential problem of power rail
sequencing during power-up/power-off cycles, if any of the multi-voltage parts
are sequence-sensitive...

Cheers

You could use the built in pc psu to control the -5v reg.


NT