			PortaCalc
This area contains code for PortaCalc, a public domain
spreadsheet program under development by Glenn Everhart. All sources
are in Fortran 66 and initial work is for RSX11M+. To move to Vax,
it may be sufficient to change references to TI: into references
to TT: and add the assembly language GETMCR supplied, though some
work on the UVT100 routines may be needed. In a pinch, simple Fortran
writes of the characters may do.
	This program was developed from Decus #VAX-15, Calc, to which it
owes much of its expression parsing. Calc was extended by G. Everhart to
handle the larger symbol name space and made into a subroutine to permit
it to be called and to keep it from printing messages when called from
the main program. The original capabilities were however retained and
PortaCalc permits one to drop into the interactive calculator mode
and reenter the spreadsheet mode on command. Output formats are standard
Fortran format designators EXCEPT that the letters A or L alone indicate
that the formula buffer is to be displayed as text (up to the column's
width) rather than displaying the number. If the format nAw is used,
the numeric will be displayed in that format, so no capability is
lost. Internal representations are normally Real*8, but if the type
is set as integer, numbers are converted to/from Integer*4 when
moving to/from storage. This permits one to use O and Z formats in
output, so that if octal or hex are meaningful, they are available.
					Glenn C. Everhart
					12/22/82
	Documents are
	PORTACALC.RNO	HELP file and general manual for PortaCalc
	PORTACALC.DOC	Further info and customization instructions
	README.1ST	General installation starting instructions
	PCG.DOC		Document for PCGRAF, the graphics output program
				that goes with PortaCalc.
