Using the Game Genie code GEOYNTEI, you can skip tests for the special device presense and jump straight to the integrity tests. Or the static red screen if the PRG data is bad, or the flashing red to green screen if CHR data isn't good. Normally, you'll see the red to green flash just before the game's boot. It means, one of these tests will be performed infinitely, but until the special device is unplugged, or until the test has passed. If any of these tests have failed, the program will jump directly to the reset routine. It was then ported to every console and computer under the sun. Although it is very primitive and simple by today's standards, it laid the ground work and invented many of the common elements we see in shmups to this day. The program calculates 24-bit partial checksums for the PRG (excluding the last 8K) and the CHR data, summing only every 15th byte, and comparing it against the etalon.īefore testing of the PRG data, the background color turns red, before testing the CHR data, it turns green. Introduction: Xevious is an early and highly influential vertical shmup developed and released by Namco to arcades in 1982. But if all data (usually 32, rarely 64 bytes) matches, self-tests will be performed. If the data output doesn't match the data input inverted, then the game continues the normal operation. The input bits are shifted to the output after 4 cycles.Īt the game's boot, it tries to send some special data to the device. The device consists of a 4-bit shift register, working as some sort of FIFO buffer. It should accept the data bit from the data input port and return it back inverted to the output data port. The operation of that device is very simple. To enable any of these tests you need a special device that should be plugged into the expansion port.
XEVIOUS NES SECRETS PRO
There are a series of Namco games, made by the programmers Haruhisa Udagawa and Kumi Hanaoka, that contain the same self-test for data integrity and they are ( Babel no Tou, Dragon Buster, Family Jockey, Lupin Sansei: Pandora no Isan, Mappy-Land, Pro Yakyuu: Family Stadium, Sanma no Meitantei, Sky Kid, and Valkyrie no Bouken: Toki no Kagi Densetsu, respectively). The last sentence in the first string means "I love Kumi-chan so much!". *program checker Haruhisa.udagawa & Kumi.Hanaoka The game contains a hidden copyright text encoded with the regular ASCII charset, but shifted down by 128 characters, at 0x19F90:
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