the bigger archives are bigger because the rom files are encrypted therefore harder to compress...anyway here's the driver from the mame source (and yes, it has been officially added to mame since January) ROM_START( kof2002 ) /* Encrypted Set */
ROM_REGION( 0x500000, REGION_CPU1, 0 )
ROM_LOAD16_WORD_SWAP( "265-p1.bin", 0x000000, 0x100000, CRC(9ede7323) SHA1(ad9d45498777fda9fa58e75781f48e09aee705a6) )
ROM_LOAD16_WORD_SWAP( "265-p2.bin", 0x100000, 0x400000, CRC(327266b8) SHA1(98f445cc0a94f8744d74bca71cb420277622b034) )
/* The Encrypted Boards do _not_ have an s1 rom, data for it comes from the Cx ROMs */
ROM_REGION( 0x20000, REGION_GFX1, 0 )
ROM_FILL( 0x000000, 0x20000, 0 )
ROM_REGION( 0x20000, REGION_GFX2, 0 )
ROM_LOAD( "sfix.sfx", 0x000000, 0x20000, CRC(354029fc) SHA1(4ae4bf23b4c2acff875775d4cbff5583893ce2a1) )
ROM_REGION( 0x20000, REGION_USER4, 0 )
/* Encrypted, we load it here for reference and replace with decrypted ROM */
ROM_LOAD( "265-m1.bin", 0x00000, 0x20000, CRC(85aaa632) SHA1(744fba4ca3bc3a5873838af886efb97a8a316104) )
/* Decrypted */
NEO_BIOS_SOUND_128K( "265-m1_decrypted.bin", CRC(1c661a4b) SHA1(4e5aa862a0a182a806d538996ddc68d9f2dffaf7) )
ROM_REGION( 0x1000000, REGION_SOUND1, ROMREGION_SOUNDONLY )
/* Encrypted */
ROM_LOAD( "265-v1.bin", 0x000000, 0x800000, CRC(15e8f3f5) SHA1(7c9e6426b9fa6db0158baa17a6485ffce057d889) )
ROM_LOAD( "265-v2.bin", 0x800000, 0x800000, CRC(da41d6f9) SHA1(a43021f1e58947dcbe3c8ca5283b20b649f0409d) )
NO_DELTAT_REGION
ROM_REGION( 0x4000000, REGION_GFX3, 0 )
/* Encrypted */
ROM_LOAD16_BYTE( "265-c1.bin", 0x0000000, 0x800000, CRC(2b65a656) SHA1(9c46d8cf5b1ef322db442ac6a9b9406ab49206c5) ) /* Plane 0,1 */
ROM_LOAD16_BYTE( "265-c2.bin", 0x0000001, 0x800000, CRC(adf18983) SHA1(150cd4a5e51e9df88688469d2ea7675c2cf3658a) ) /* Plane 2,3 */
ROM_LOAD16_BYTE( "265-c3.bin", 0x1000000, 0x800000, CRC(875e9fd7) SHA1(28f52d56192d48bbc5dc3c97abf456bd34a58cbd) ) /* Plane 0,1 */
ROM_LOAD16_BYTE( "265-c4.bin", 0x1000001, 0x800000, CRC(2da13947) SHA1(f8d79ec2c236aa3d3648a4f715676899602122c1) ) /* Plane 2,3 */
ROM_LOAD16_BYTE( "265-c5.bin", 0x2000000, 0x800000, CRC(61bd165d) SHA1(b3424db84bc683d858fb635bc42728f9cdd89caf) ) /* Plane 0,1 */
ROM_LOAD16_BYTE( "265-c6.bin", 0x2000001, 0x800000, CRC(03fdd1eb) SHA1(6155c7e802062f4eafa27e414c4e73ee59b868bf) ) /* Plane 2,3 */
ROM_LOAD16_BYTE( "265-c7.bin", 0x3000000, 0x800000, CRC(1a2749d8) SHA1(af7d9ec1d576209826fa568f676bbff92f6d6ddd) ) /* Plane 0,1 */
ROM_LOAD16_BYTE( "265-c8.bin", 0x3000001, 0x800000, CRC(ab0bb549) SHA1(d23afb60b7f831f7d4a98ad3c4a00ee19877a1ce) ) /* Plane 2,3 */
ROM_END btw, no rom requests [edit]re-read; you need to update your BIOS!