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.TH "ALFSUM" 1 "2025-11-14" "0.1.0" "Urchlay's Atari 8-bit Tools"
.SH NAME
alfsum \- calculate ALF checksums
.\" RST source for alfsum(1) man page. Convert with:
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.\" rst2man.py alfsum.rst > alfsum.1
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.SH SYNOPSIS
.sp
alfsum \fBfile\fP [\fBfile\fP ...]
.SH DESCRIPTION
.sp
\fBalfsum\fP calculates the checksums used by the \fBALF\fP compression
utility on the Atari 8\-bit platform.
.sp
There are no options. Use \fB\-\fP to read from standard input. Use
\fB\&./\-file\fP to read a file whose name begins with \fB\-\fP\&.
.SH NOTES
.sp
The checksum algorithm is very simple: all the bytes in the file are
added together, and the low 16 bits of the result are the checksum.
.SH EXIT STATUS
.INDENT 0.0
.TP
.B 0
Success.
.TP
.B 1 to 254
File I/O error count. If there are more than 254 I/O errors, 254 is returned.
.TP
.B 255
Error in command\-line arguments.
.UNINDENT
.SH COPYRIGHT
.sp
\fBunalf\fP is released under the WTPFL: Do WTF you want with this.
.SH AUTHORS
.INDENT 0.0
.IP B. 3
Watson <\fI\%urchlay@slackware.uk\fP>
.UNINDENT
.SH SEE ALSO
.sp
TODO
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