>> Yes! The good news is that newer FreeDOS kernels even have a simple
>> version built into the kernel itself. [..]
> Good news! Well, I should have googling for "FreeDOS idle CPU",
> instead of "DOS idle CPU". ;)


>> However, the normal way to let the CPU idle while DOS is idle is to
>> load a suitable driver or TSR. In MS DOS you would use POWER but in
>> FreeDOS you use the similar FDAPM tool. To load and activate it, run

That will work on any DOS hardware,  but of course
it makes more difference on more energy-hungry CPU.

>> PS: You can also use FDAPM to ACPI throttle your CPU if your board
>> supports that. [..]

Probably only with Pentium II / AMD K6 and newer.
But then 386s had a turbo button for the same ;-)

> I want  to replace a DOS installation on quite old computer - it is
> 386SX25 - which I'm keeping around just because it's s.c. "booksize

Still nice to save some energy with little work :-)

> PC". It has no ACPI, not even APM. I understand, that the FDAPM is
> most recommended method, but - from the other side - using this very
> old computer only the kernel built-in method will work? Am I right?

FDAPM automatically detects whether you have APM or
ACPI support. On your computer, it will only set the
CPU to "halt" (like the kernel idlehalt feature) but
will do so more often than the kernel feature, as it
turns more cases of "busy wait" into "halt wait" :-)

Because you have no ACPI, the FDAPM SPEEDn (n = 1-9)
function will have no effect so you cannot throttle.

Also, because you have no PCI, the PCISLEEP tool is
not available on your PC to do standby and suspend
related things or show a list of extension cards.

If you have ISA PnP extension cards - there is an
Intel ISA PnP manager that you could download but
it is a bit bloated in size and ISA does not have
standby or suspend features anyway, just a config.


PS: Please mail if you find apps that need a 486+.
Of course PCISLEEP / UIDE / UMBPCI would need PCI.

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