This is a cheat program for the 1987 classic "Ports of Call". It is mainly a little reverse engineering exercise I did to keep my real mode debugging skills up to date. It only works to cheat on single player savegames currently and does not perform any sophisticated sanity checks.
$ ./poccheat -m 123456000 SAVEGAME.TRP
Current money : 8224000 (8.2 million)
Current checksum : 2bca2d26
Calculated checksum: 2bca2d26 (OK)
New money : 123456000 (123.5 million)
New checksum : d1b3e586
The output file is called cheat.trp.
GNU GPL-3.