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HERCULES.DOC
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1990-03-16
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ASTROL96 program users with monochrome Hercules graphics adapter cards
(720x348) can access the program's graphics features by loading a color
graphics emulator utility such as SIMCGA.COM into memory prior to running
ASTROL96. This utility will cause the Hercules board to simulate the
IBM Color Graphics Adapter (CGA) board for which ASTROL96 is written.
(Note: the AstrolDeluxe chartwheel directly supports Hercules.)
You can obtain a printed hardcopy of the graphic chartwheel displayed on
a monitor using a Hercules monochrome graphics board simply by loading
GRAPHICS.COM beforehand and using Shift-PrtScr as normal, as discussed
in the file GRAPHICS.DOC.
The archive file HERCULES.ARC on the distribution diskette includes
a public domain utility program which will cause a Hercules
monographics card to emulate an IBM color graphics card. The
archive files are:
SIMCGA.COM - See archive file SIMCGA.DOC.
SETMONO.COM - Turn off emulation.
SETCGA.COM - Turn emulation back on.
SIMCGA.DOC - Documentation by the author of this emulation utility.
The above programs and document files are contained in an archive file
on the distribution diskette called HERCULES.ARC. You will also find a
program on the distribution diskette called ARCE.COM which may be used to
extract a file from the archive. As an example of the syntax involved,
if the distribution diskette is on drive A: and you want to extract
SIMCGA.DOC from HERCULES.ARC to a diskette on drive B:, then from the
A> prompt, enter:
ARCE HERCULES SIMCGA.DOC B:
Or, if you want to extract to the ASTROL directory on drive C:, then
from the A> prompt, enter:
ARCE HERCULES SIMCGA.DOC C:\ASTROL
Additional information on using ARCE.COM will display if you type
ARCE with no parameters.
IMPORTANT NOTE FOR HERCULES GRAPHICS USERS
------------------------------------------
Before running ASTROL96 with CGA simulation, run CUSTOM96 and use the
option at the Supplementary Menu to change the text screen colors from
yellow on black (14 and 0) to light gray on black (7 and 0). This is
a precaution to avoid blowing components in your monochrome monitor's
video board if the CGA simulation is incomplete. If you do this, the
U.S. map will be the only color screen remaining. If, during CGA
simulation, any part of the U.S. map appears in high intensity, turn off
your computer immediately. The one case of video board damage that I
know of involved a Hercules Plus card on an IBM PC with an early version
of the shareware color emulation utility HGCIBM.COM.
After extracting SIMCGA.COM, enter SIMCGA at the DOS prompt and your
screen should change from Hercules resolution to CGA resolution.
On a true-blue AT with an original Hercules monographics card I preferred
SIMCGA, but if you have a different set-up then SIMCGA may not work. If
it does not, order the latest version of HGCIBM.COM directly from its
author. HGCIBM.COM handles a wider variety of computers, including the
Leading Edge, model D computer. Obtain it by sending $9.95 plus $3.00
handling, together with the type of graphic card and monitor you have, to:
Athena Digital, 2351 College Station Rd., Ste. 567, Athens, GA 30605.