PortaCalc Save File Format

	PortaCalc's P class commands use a sequential file
which encodes the values in active cells only. This file
may readily be handled in Fortran or other languages.
	Each cell is output in 2 lines with the following
formats:
	A1,I5,',',I5,',',109A1	(SYMBOLIC SAVE)
 OR	A1,I5,',',I5,',',E50.35 (NUMERIC SAVE)
 and then
	I3,',',9A1,',',I5

The numbers encoded in the first format are:
A1	-	Letter P or D indicating Physical or Display sheet save
		(usually ignored)
I5	-	Row relative to cursor at save time, starting at 1 for
		cursor location and increasing (saves only from cursor
		right and down)
I5	-	Column relative to cursor at save time, starting at 1
109A1
or	-	Formula in cell, or value in cell (depends on Symbolic
E50.35		or Numeric save which is present)

The numbers encoded in the second format are:
I3	-	FVLD - Valid byte. Its meaning is that negative values
		are text (-1 means alphas are present, -2 or -3 mean only
		numerics and/or punctuations), 0 is an inactive cell (should
		never appear in a save), and +1 means formula with alphas,
		+2 or +3 means formula with no alphas (2 or 3 switches whether
		it was computed or not).
9A1	-	Format string for formatting cell on output
I5	-	Type number. Normally 2 for reals, 4 for integers, negative
		values mean uninitialized. Negative numbers basically
		never will appear here.

	The fields are separated by commas so BASIC can handle them.

	These numbers may be read by FORTRAN formats as follows:

1000	FORMAT(A1,I5,X,I5,X,109A1) or
1000	FORMAT(A1,I5,X,I5,X,E50.35)

2000	FORMAT(I3,X,9A1,X,I5)


	Note this sort of encoding is needed to allow the format
encoding to be recorded in the file; the DIF format lacks room
to do this. On read-back, cells outside legal boundaries are not
used.
	To add pie charts or other graphics, a simple mod to PCGRAF
with addition of suitable graphics output routines for your favorite
graphics device would give such graphics output from PortaCalc
saved spread sheets (provided they were saved numerically).