Category : Display Utilities
Archive   : SIMCGA41.ZIP
Filename : PATCHES.DOC

PATCHES FOR CERTAIN
POPULAR GAMES

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All lines to be entered by the user are marked with an asterisk (*) on the
far right side of this listing. Further, all entered lines end with the
RETURN or ENTER key. BE SURE TO MAKE BACKUP COPIES OF YOUR PROGRAMS BE-
FORE PATCHING THEM - A BAD PATCH IS FOREVER!

1. Patch to ZAXXON by Sega for DOS 3.0 or later

This will not affect normal operation with a CGA.

DEBUG ZAXXON.COM *
-F100 L13 8C C8 05 20 00 8E C0 50 31 DB 05 60 05 26 A3 01 00 53 CB *
-W *
Writing 5100 Bytes
-Q *

2. DIGGER will run with no changes to the program itself, but needs the
following statements to set the display up -

SIMCGA 5 I *
MEDRES *
DIGGER *

3. SPACEWAR will run with the following patch - it does not affect operation
with a normal CGA card -

RENAME SPACEWAR.EXE SPACEWAR.DAT *
DEBUG SPACEWAR.DAT *
-F2DC7 L1 90 *
-W *
Writing 5800 Bytes
-Q *
RENAME SPACEWAR.DAT SPACEWAR.EXE *

To run SPACEWAR, use -

SIMCGA I *
SPACEWAR *


4. BATTLEZONE will run on DOS 2 without changes - DOS 3.1 or later needs
patches to work in either SIMCGA or normal CGA mode. The problem is
with DOS 3.X interrupt support for networks.

If you want to run BATTLEZONE under DOS 3.1, try the following patch -

DEBUG BZONE.COM *
-F106 LE BF 20 00 E8 18 00 BF 24 00 E8 12 00 EB 3C *
-F124 L10 50 1E 06 31 C0 8E C0 FA 26 C5 1D 81 7F f8 00 F0 *
-F134 L11 75 0A C5 5F F6 26 89 1D 26 8C 5D 02 FB 07 1F 58 C3 *
-W *
Writing 300 Bytes
-Q *

To run, do this -

SIMCGA I 3 S *
...press Return to reboot DOS... *
BZONE *

This approach may be used with any game that loads itself over DOS.
The "S" parameter allows SIMCGA to relocate itself at the top of
your machine's memory - out of the way of DOS and your game.