Atari 400 Technical Reference Manual page 113

Load Floating Point Number to FR1 (FLD1R and FLD1P)
Function: These routines load pseudo register FR1 with the
Iloating point number specilied by the calling sequence.
Calling sequences:
As in prior description, except the result goes to FRl
instead of FRO. FL01R [0098] and FLD1P COD9C].
store Floating Point Number From FRO (FSTOR and FSTOP)
Function: These routines store the contents of pseudo register
FRO to the address specified by the calling sequence:
Calling sequence:
As in prior descriptionsl except the floating point number
is stored from FRO rather than loaded to FRO. FSTOR [DDA71
and FSTOP CDDABJ.
Move Floating Point Number From FRO to FR1 (FMOVE)
Function: This routine moves the floating point number in FRO to
pseudo register FR1.
Calling sequence:
JSR FMOVE CDDB6J
FRl
=
FRO (FRO remains unchanged).
RESOURCE UTILIZATION
The floating point package uses the lollowing RAM locations in
the course of performing the functions described in this section:
0004 through OOFF
057E through 05FF
All of these locations are available for program coding
if your program does not call the floating point package.
OPERATING SYSTEM C016555 -- Section 8
128