Harvard Presentation Graphics A.00 (1.00)
Released February 27, 1986 by Software Publishing Corp
For DOS

Image Quality: Used/One of five hard drive installs has been used.

This is the very first release of Harvard Graphics, an extremely
popular late 1980s graphing/plotting/presentation creation
application for DOS. "A.00" or just "A" indicates first release with
no revisions.  "Harvard Presentation Graphics" was shortened and the
letter-based version numbering was dropped for "Harvard Graphics
2.00"

IMPORTANT!: This software is copy protected, and no unprotect is
provided.

The copy protection requires that the Program Disk be in the A:
drive. (A problem if one had a 3.5" for A: and 5.25 as B:) The copy
protection seems to fail on later AT class computers. But it was
tested to work on several XT class computers.

The software permits application installation to a hard drive only 
five times. It also insists that you "de-install" before it permits
reinstallation, although the de-installation tool seems satisfied
when pointing it to the root of a hard drive where no installation
exists.

The protection method is quite unusual. It stores the text "SPC1986" 
in the gap area immediately after the sector data of some sectors on
cylinder 5. It can read this data by doing a special non-standard
track read, but a normal FDC can not create this data. It also keeps
track of the number of times you installed the product by writing to
some of these sectors, which partially overwrites the data in the gap
area.

On top of all of that, it "protects" the hard drive installation by
recording the application's location so the installed files can not
be copied to a different drive. Running a defragmenter will cause the
protection to fail.

This software is designed for IBM PC/XT PC/AT and compatibles.  
Requires MS-DOS 2.0 or higher, 256K ram or 386K for VDI devices, and
a hard disk or two floppy drives. Supports Hercules, EGA, and CGA
graphics.

A few months later, version A.00 was followed up by version A.01.  
This was a minor update but removes the copy protection. (SPC used an
odd A:00, A:01, B:00 style version numbering on many of their early
products)

Use the following commands to make a PSI image that works in the PCE
emulator:

pfi disk01.scp -r 500000 -c 0-39 -p decode pri disk01-scp-mfm.pri
pfi disk01.scp -r 250000 -c 40-41 -p decode pri disk01-scp-fm.pri
pri disk01-scp-mfm.pri -m disk01-scp-fm.pri disk01-scp.pri
pri disk01-scp.pri -p decode auto disk01-1.psi
psi disk01-1.psi -e position -1 -c 5 -h 0-1 -s 1-5 -p delete disk01-1.psi
pri disk01-scp.pri -c 5 -h 0-1 -s mfm-min-size 1024 -p decode auto disk01-2.psi
psi disk01-2.psi -e crc-data 0 -e position -1 -c 5 -h 0-1 -s 6-9 -p delete disk01-2.psi
psi disk01-2.psi -m disk01-1.psi disk01.psi

This enables you to run HPG from the floppy disk, however it will not
install. This may be due to the "perfect" emulation of the floppy 
drive, which makes it impossible to randomly clobber the gap data 
like a real floppy would.

This archive contains two 5.25" 360K floppy disk images.