8 Nov
2006
8 Nov
'06
5:01 p.m.
On Wed, 8 Nov 2006, Chris M wrote:
I read something in an early BYTE stating that as
time went on, the dip switches on the pc's mobo had
little consequence on the systems ability to determine
the amount of ram installed. Am I in error to state
that the dip switches are read by code? Perhaps
someone can confirm, deny, elaborate, denounce...
The PC (5150) had TWO sets of switches, one for RAM, and one for other
configuration (drives, FPU, etc.)
The XT had ONE set of switches for configuration, and made its own
determination of how much RAM there was.
Int 11h returns (in AX) the configuration switches.
Int 12h returns the amount of RAM.