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+==== MouSetScaleFact ====
+**Bindings**: C, MASM
+This call assigns to the current mouse device driver a new pair of 1-word scaling factors.
+//MouSetScaleFact// (ScaleStruct, DeviceHandle)
+//ScaleStruct// (**PSCALEFACT**) - input
+Address of the control block structure that contains the current row and column coordinate scaling factors. The scaling factors must be greater than or equal to 1 and less than or equal to (32K - 1).
+//rowscale// (**USHORT**)
+Row scaling factor.
+//colscale// (**USHORT**)
+Column scaling factor.
+**DeviceHandle** (**HMOU**) - input
+Handle of the mouse device from a previous MouOpen.
+//rc// (**USHORT**) - return
+Return code descriptions are:
+|0 |NO_ERROR |
+|385 |ERROR_MOUSE_NO_DEVICE |
+|387 |ERROR_MOUSE_INV_PARMS |
+|466 |ERROR_MOU_DETACHED |
+|501 |ERROR_MOUSE_NO_CONSOLE |
+|505 |ERROR_MOU_EXTENDED_SG |
+**Remarks**
+[[en:ibm:prcp:mou:setscalefact|MouSetScaleFact]] sets the mickey-to-pixel ratio for mouse motion. The row scale and column scale ratios specify a number of mickeys for each 8 pixels. The default value for the row scale is 16 mickeys for each 8 pixels. The default value for the column scale is 8 mickeys to 8 pixels.
+The number of pixels moved does not have to correspond 1-to-1 with the number of mickeys the mouse moves. The scaling factor defines a sensitivity for the mouse that is a ratio of the number of mickeys required to move the cursor 8 pixels on the screen. The sensitivity determines at what rate the cursor moves on the screen.