(SYSLIB) Programming Reference Manual - Public Support Login ...

9.1.2. ASCII to Fieldata Conversion
FDASC$–Fieldata/ASCII Data Conversion
FDASC$ converts ASCII character strings to Fieldata when the ASCFD$ entry point is
called.
The following table lists the calling sequences.
Auto Switch Common Bank or Relocatable Relocatable
L,U A0,input-buffer-word- count
L,U A1,input-buffer-address
L,U A2,output-buffer-address
LMJ X11,CBASCFD$-1
normal return
L,U A0,input-buffer-word- count
L,U A1,input-buffer-address
L,U A2,output-buffer-address
I$BJ X11,CBASCFD$
normal return
L,U A0,input-buffer-word- count
L,U A1,input-buffer-address
L,U A2,output-buffer-address
LMJ X11,ASCFD$
normal return
ASCFD$ converts the ASCII characters in the input buffer (four characters per word) to
Fieldata and places them in the output buffer (six characters per word, with trailing
space-fill if necessary). The length of the output buffer in words must be at least twothirds
the length of the input buffer. The input buffer and the output buffer may specify
the same buffer, since the string is converted head to tail to prevent overwriting.
ASCFD$ returns the word length of the converted Fieldata image in register A0.
9.2. TABLE$–Fieldata/ASCII Conversion Table
TABLE$ contains the conversion codes for each ASCII and Fieldata character. Each
word of TABLE$ has the ASCII to Fieldata code in H1 and the Fieldata to ASCII code in
H2. The H2 portion of TABLE$ is used when the FDASC$ entry point is called; the H1
portion is used when the ASCFD$ entry point is called.
TABLE$ is 256 words long and has an entry point of ASCFDASC$. The H2 portion of the
last 192 words (Fieldata to ASCII codes) is unused.
TABLE$ is a relocatable element in the file SYS$LIB$*SYSLIB and is also collected in the
SYSLIB common bank SYSLIB$3.
7833 1733–004 9–3