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Page References

Incoming links Outgoing links
FAST FLOATING POINT source code for the ATARI
FAST FLOATING POINT source code for the ATARI

Version management

Difference between version and

At line 19 changed one line
* [Fast Chip source code file for AMAC|FASTCHIP.ASM]
* [Fast Chip source code file for AMAC|FASTFP.ASM]
At line 1,308 added 58 lines
!!FLOATING POINT ROM ENTRY POINTS
{{{
FLOATING POINT ROM ENTRY POINTS
Entry Address Function
Point
AFP D800 Extract a floating point number from an ASCII
string (FR0<--[INBUFF+CIX])
FASC D8E6 Convert a floating point number to an ASCII
string (returns pointer in INBUFF)
IFP D9AA Convert a 2-byte integer (FR0) to a floating
point number (in FR0)
FPI D9D2 Convert a floating point number to an integer
ZFR0 DA44 Zero the floating point register (FR0)
ZF1 DA46 Zero 6 zero page bytes pointed to by "X"
ZPG0 DA48 Zero "Y" bytes pointed to by "X"
INITBF DA51 Store the address of LBUFF in INBUFF
DBLZ2 DA5A Shift Z2 left one bit (16-bit High/Low format)
FSUB DA60 Subtract FR1 from FR0
FADD DA66 Add FR1 to FR0 (result in FR0)
FMUL DADB Multiply FR0 by FR1 (result in FR0)
FDIV DB28 Divide FR0 by FR1 (result in FR0)
SKBLK DBA1 Skip 0 or more blanks pointed to by [INBUFF,CIX],
result modifies CIX
GCHAR DBAF Read a byte, convert it as an ASCII decimal
number, set CY if it is not
SH0L4 DBE4 Shift the contents of FR0 left 4 bits
NORMAL DC00 Normalize the contents of FR0
PLYEVL DD40 Evaluate the polynomial [Y.X](FR0), with A terms
FLD0R DD89 Load FR0 from [Y.X]
FLD0P DD8D Load FR0 from [FLPTR]
FLD1R DD98 Load FR1 from [Y.X]
FLD1P DD9C Load FR1 from [FLPTR]
FST0R DDA7 Store FR0 into 6 bytes pointed to by [Y.X]
FST0P DDAB Store FR0 into [FLPTR]
FMOVE DDB6 Copy FR0 over into FR1
EXP DDC0 FR0 <-- exponential function of FR0
EXP10 DDCC FR0 <-- 10 ^ FR0 (exponent of 10)
REDARG DE95 FR0 <-- (FR0-[Y.X])/(FR0+[Y.X])
LOG DECD FR0 <-- natural log of FR0
LOG10 DED1 FR0 <-- base 10 log of FR0
HALF DF6C Constant = 0.5000000000
PLYSIN DFAE 11 Constant table for SIN polynomial
NONE DFEA Constant = 0.9999999999
SIN45 DFF0 Constant = sin(45 deg.)
Entry points not in the ATARI "D" ROM
RSTARG DD22 Copy PLYARG over into FR1
LDARG DD2D Copy PLYARG over into FR0
PLYONE DD38 Same as PLYEVL except implicit 1.0 coefficient
LDPLY DD62 Copy [FPTR2] into FR1, add 6 to FPTR2
SAVARG DD78 Store X into FPTR2, Y into FPTR2+1, copy FR0
over into PLYARG
}}}
This page (revision-18) was last changed on 03-Feb-2023 15:21 by Roland B. Wassenberg  Top