The XPARAM IOP module writes PARAM values to 0xFFFE01a0 and 0xFFFE01a4.
In the PPC store handler for these addresses copy the PARAM value to a
struct in memory @ 0xbe09e0 - 0xbe0a24. From there the values are used by their respective functions. The XPARAM struct can be written to directly

  • 0xFFFE01a0 = index
  • 0xFFFE01a4 = value

bypassing the need to use the rom0:XPARAM IOP module wich was operated by rom0:PS2LOGO on Sony’s plans.

original design included a database of games that needed of XPARAMs to work.
aditionally, game’s SYSTEM.CNF could provide their own XPARAM settings by adding an PARAM2 entry. and the value passed had to be the XPARAM argumments followed by an MD5 hash. Disc params had higher priority than rom database params.

SYSTEM.CNF example taken from Critical Velocity (SLPS_255.32):

BOOT2 = cdrom0:\SLPS_255.32;1
VER = 1.01
VMODE = NTSC
PARAM2 = 0X10_0:812E98BD247B5EB74CD7A1F9EEDBF355

You can find copies of the two versions of the XPARAM database as well as some information about them here

you can find a list of the IDs for the games that added their own XPARAM modules in this piece of code

XPARAM Struct Address

range: 0xbe09e0 - 0xbe0a24

Offset Name Default Value
0x0 PARAM_MDEC_DELAY_CYCLE 0x01F4
0x4 PARAM_SPU_INT_DELAY_LIMIT 0x07D0
0x8 PARAM_SPU_INT_DELAY_PPC_COEFF 0x0023
0xC PARAM_SPU2_INT_DELAY_LIMIT 0x07D0
0x10 PARAM_SPU2_INT_DELAY_PPC_COEFF 0x0014
0x14 PARAM_DMAC_CH10_INT_DELAY 0x0000
0x18 PARAM_CPU_DELAY 0x0001
0x1C PARAM_SPU_DMA_WAIT_LIMIT 0x0020
0x20 PARAM_GPU_DMA_WAIT_LIMIT 0x0000
0x24 PARAM_DMAC_CH10_INT_DELAY_DPC 0x0000
0x28 PARAM_CPU_DELAY_DPC 0x0000
0x2c PARAM_USB_DELAYED_INT_ENABLE 0x0000
0x30 PARAM_TIMER_LOAD_DELAY 0x0000
0x34 PARAM_SIO0_DTR_SCK_DELAY 0x229C
0x38 PARAM_SIO0_DSR_SCK_DELAY_C 0x06EC
0x3c PARAM_SIO0_DSR_SCK_DELAY_M 0x06EC
0x40 PARAM_MIPS_DCACHE_ON 0x0001
0x44 PARAM_CACHE_FLASH_CHANNELS 0x0090

PARAM_CPU_DELAY

used to control timing:

(ppc_clk_delta * mips_clk_factor) / PARAM_CPU_DELAY or PARAM_CPU_DELAY_DPC

PARAM_TIMER_LOAD_DELAY

Controls load delay when reading from timer0 in ps1 mode

PARAM_SIO0_D*

appear to be multiples of the CPU clock period (2.27ns @ 440MHz).

PARAM_SIO0_DTR_SCK_DELAY 

0x229c == 8860 * 2.27ns = 20.1122 uS

PARAM_SIO0_DSR_SCK_DELAY_C 

0x6ec  == 1772 * 2.27ns = 4.02244 uS

PARAM_SIO0_DSR_SCK_DELAY_M 

0x6ec  == 1772 * 2.27ns = 4.02244 uS

PARAM_MIPS_DCACHE_ON

Controls which set of TLB entries are used for the lower 2MBs of IOP RAM.

  • 0: uncached entries for this region
  • 1: cached entries for this region

Sony official XPARAM databases

2.20 ROM database

2.20 ROM
GAME PARAM VALUE
PAPX_905.17 PARAM_MIPS_DCACHE_ON 0x0
SCAJ_200.04 PARAM_MIPS_DCACHE_ON 0x0
SCAJ_200.24 PARAM_MIPS_DCACHE_ON 0x0
SCAJ_201.25 PARAM_MIPS_DCACHE_ON 0x0
SCAJ_201.26 PARAM_MIPS_DCACHE_ON 0x0
SCES_500.00 PARAM_CPU_DELAY 0xbb8
SCKA_200.49 PARAM_MIPS_DCACHE_ON 0x0
SCPS_110.13 PARAM_MIPS_DCACHE_ON 0x0
SCPS_150.33 PARAM_MIPS_DCACHE_ON 0x0
SCPS_150.39 PARAM_MIPS_DCACHE_ON 0x0
SCPS_550.29 PARAM_MIPS_DCACHE_ON 0x0
SCPS_550.42 PARAM_MIPS_DCACHE_ON 0x0
SCPS_550.48 PARAM_MIPS_DCACHE_ON 0x0
SCUS_971.33 PARAM_MIPS_DCACHE_ON 0x0
SCUS_971.67 PARAM_CACHE_FLASH_CHANNELS 0x0
SCUS_971.67 PARAM_CPU_DELAY 0xe10
SCUS_972.64 PARAM_MIPS_DCACHE_ON 0x0
SCUS_972.75 PARAM_MIPS_DCACHE_ON 0x0
SCUS_974.01 PARAM_MIPS_DCACHE_ON 0x0
SCUS_974.02 PARAM_CPU_DELAY 0x780
SCUS_974.02 PARAM_MIPS_DCACHE_ON 0x0
SLES_500.30 PARAM_MIPS_DCACHE_ON 0x0
SLES_500.62 PARAM_CPU_DELAY 0xbb8
SLES_500.62 PARAM_MIPS_DCACHE_ON 0x0
SLES_500.73 PARAM_CPU_DELAY 0xa28
SLES_500.73 PARAM_MIPS_DCACHE_ON 0x0
SLES_504.35 PARAM_CACHE_FLASH_CHANNELS 0x0
SLES_504.43 PARAM_MIPS_DCACHE_ON 0x0
SLES_506.86 PARAM_MIPS_DCACHE_ON 0x0
SLES_510.56 PARAM_MIPS_DCACHE_ON 0x0
SLES_510.57 PARAM_MIPS_DCACHE_ON 0x0
SLES_512.98 PARAM_CPU_DELAY 0x1db0
SLES_512.98 PARAM_DMAC_CH10_INT_DELAY 0x3e8
SLES_512.98 PARAM_MIPS_DCACHE_ON 0x0
SLES_513.03 PARAM_MIPS_DCACHE_ON 0x0
SLES_513.55 PARAM_CPU_DELAY 0xbb8
SLES_513.55 PARAM_MIPS_DCACHE_ON 0x0
SLES_514.25 PARAM_MIPS_DCACHE_ON 0x0
SLES_515.53 PARAM_CACHE_FLASH_CHANNELS 0x0
SLES_515.53 PARAM_CPU_DELAY 0xfa0
SLES_515.53 PARAM_DMAC_CH10_INT_DELAY 0x708
SLES_517.72 PARAM_MIPS_DCACHE_ON 0x0
SLES_519.17 PARAM_CPU_DELAY 0x960
SLES_519.17 PARAM_MIPS_DCACHE_ON 0x0
SLES_519.32 PARAM_MIPS_DCACHE_ON 0x0
SLES_522.14 PARAM_CPU_DELAY 0xaf0
SLES_522.14 PARAM_MIPS_DCACHE_ON 0x0
SLES_522.37 PARAM_MIPS_DCACHE_ON 0x0
SLES_522.65 PARAM_MIPS_DCACHE_ON 0x0
SLES_524.67 PARAM_MIPS_DCACHE_ON 0x0
SLES_524.68 PARAM_MIPS_DCACHE_ON 0x0
SLES_524.69 PARAM_MIPS_DCACHE_ON 0x0
SLES_525.87 PARAM_DMAC_CH10_INT_DELAY 0x5dc
SLES_526.93 PARAM_MIPS_DCACHE_ON 0x0
SLES_527.09 PARAM_MIPS_DCACHE_ON 0x0
SLES_528.11 PARAM_CPU_DELAY 0x1388
SLES_528.45 PARAM_CPU_DELAY 0x2ee0
SLES_528.45 PARAM_DMAC_CH10_INT_DELAY 0x2ee0
SLES_528.45 PARAM_DMAC_CH10_INT_DELAY_DPC 0x2bf20
SLES_528.45 PARAM_MIPS_DCACHE_ON 0x0
SLES_528.61 PARAM_MIPS_DCACHE_ON 0x0
SLKA_250.26 PARAM_CACHE_FLASH_CHANNELS 0x0
SLKA_250.26 PARAM_CPU_DELAY 0xfa0
SLKA_250.26 PARAM_DMAC_CH10_INT_DELAY 0x708
SLKA_250.63 PARAM_MIPS_DCACHE_ON 0x0
SLKA_250.80 PARAM_MIPS_DCACHE_ON 0x0
SLKA_250.84 PARAM_MIPS_DCACHE_ON 0x0
SLKA_251.38 PARAM_MIPS_DCACHE_ON 0x0
SLKA_251.45 PARAM_MIPS_DCACHE_ON 0x0
SLKA_251.46 PARAM_MIPS_DCACHE_ON 0x0
SLKA_251.74 PARAM_MIPS_DCACHE_ON 0x0
SLKA_252.18 PARAM_CPU_DELAY 0xc80
SLKA_252.18 PARAM_DMAC_CH10_INT_DELAY 0x190
SLKA_252.18 PARAM_MIPS_DCACHE_ON 0x0
SLKA_252.34 PARAM_MIPS_DCACHE_ON 0x0
SLKA_252.57 PARAM_MIPS_DCACHE_ON 0x0
SLPM_601.95 PARAM_MIPS_DCACHE_ON 0x0
SLPM_602.04 PARAM_MIPS_DCACHE_ON 0x0
SLPM_602.05 PARAM_MIPS_DCACHE_ON 0x0
SLPM_602.22 PARAM_MIPS_DCACHE_ON 0x0
SLPM_602.23 PARAM_MIPS_DCACHE_ON 0x0
SLPM_610.48 PARAM_CPU_DELAY 0x960
SLPM_610.48 PARAM_MIPS_DCACHE_ON 0x0
SLPM_610.96 PARAM_MIPS_DCACHE_ON 0x0
SLPM_620.77 PARAM_MIPS_DCACHE_ON 0x0
SLPM_620.78 PARAM_MIPS_DCACHE_ON 0x0
SLPM_620.79 PARAM_CPU_DELAY 0x640
SLPM_620.79 PARAM_MIPS_DCACHE_ON 0x0
SLPM_621.19 PARAM_CPU_DELAY 0x622
SLPM_621.25 PARAM_CPU_DELAY 0xfa0
SLPM_621.25 PARAM_MIPS_DCACHE_ON 0x0
SLPM_621.55 PARAM_CPU_DELAY 0x668
SLPM_622.04 PARAM_MIPS_DCACHE_ON 0x0
SLPM_622.05 PARAM_MIPS_DCACHE_ON 0x0
SLPM_622.18 PARAM_MIPS_DCACHE_ON 0x0
SLPM_622.52 PARAM_MIPS_DCACHE_ON 0x0
SLPM_622.54 PARAM_MIPS_DCACHE_ON 0x0
SLPM_622.93 PARAM_MIPS_DCACHE_ON 0x0
SLPM_623.23 PARAM_MIPS_DCACHE_ON 0x0
SLPM_623.29 PARAM_MIPS_DCACHE_ON 0x0
SLPM_623.30 PARAM_MIPS_DCACHE_ON 0x0
SLPM_623.40 PARAM_MIPS_DCACHE_ON 0x0
SLPM_623.73 PARAM_MIPS_DCACHE_ON 0x0
SLPM_623.78 PARAM_CPU_DELAY 0xbb8
SLPM_623.78 PARAM_MIPS_DCACHE_ON 0x0
SLPM_624.08 PARAM_DMAC_CH10_INT_DELAY 0x600
SLPM_625.11 PARAM_MIPS_DCACHE_ON 0x0
SLPM_625.43 PARAM_MIPS_DCACHE_ON 0x0
SLPM_650.10 PARAM_CPU_DELAY 0x190
SLPM_650.10 PARAM_MIPS_DCACHE_ON 0x0
SLPM_650.11 PARAM_MIPS_DCACHE_ON 0x0
SLPM_650.20 PARAM_MIPS_DCACHE_ON 0x0
SLPM_650.21 PARAM_MIPS_DCACHE_ON 0x0
SLPM_650.30 PARAM_CPU_DELAY 0xdac
SLPM_650.30 PARAM_MIPS_DCACHE_ON 0x0
SLPM_650.52 PARAM_MIPS_DCACHE_ON 0x0
SLPM_650.86 PARAM_CPU_DELAY 0xb60
SLPM_650.86 PARAM_MIPS_DCACHE_ON 0x0
SLPM_650.87 PARAM_CPU_DELAY 0xb60
SLPM_650.87 PARAM_MIPS_DCACHE_ON 0x0
SLPM_651.21 PARAM_CPU_DELAY 0x9c4
SLPM_651.21 PARAM_MIPS_DCACHE_ON 0x0
SLPM_651.31 PARAM_MIPS_DCACHE_ON 0x0
SLPM_651.79 PARAM_CPU_DELAY 0xbb8
SLPM_651.79 PARAM_MIPS_DCACHE_ON 0x0
SLPM_652.09 PARAM_CPU_DELAY 0xaf0
SLPM_652.09 PARAM_MIPS_DCACHE_ON 0x0
SLPM_652.40 PARAM_CPU_DELAY 0x67c
SLPM_652.46 PARAM_MIPS_DCACHE_ON 0x0
SLPM_652.49 PARAM_CACHE_FLASH_CHANNELS 0x0
SLPM_652.49 PARAM_CPU_DELAY 0xfa0
SLPM_652.49 PARAM_DMAC_CH10_INT_DELAY 0x708
SLPM_652.75 PARAM_DMAC_CH10_INT_DELAY 0x600
SLPM_653.70 PARAM_CPU_DELAY 0xa28
SLPM_653.70 PARAM_DMAC_CH10_INT_DELAY 0x12c
SLPM_653.70 PARAM_MIPS_DCACHE_ON 0x0
SLPM_653.74 PARAM_MIPS_DCACHE_ON 0x0
SLPM_654.24 PARAM_CACHE_FLASH_CHANNELS 0x0
SLPM_654.24 PARAM_DMAC_CH10_INT_DELAY 0x8ca0
SLPM_654.25 PARAM_CACHE_FLASH_CHANNELS 0x0
SLPM_654.25 PARAM_DMAC_CH10_INT_DELAY 0x8ca0
SLPM_654.38 PARAM_CPU_DELAY 0xaf0
SLPM_654.38 PARAM_MIPS_DCACHE_ON 0x0
SLPM_654.49 PARAM_MIPS_DCACHE_ON 0x0
SLPM_654.59 PARAM_MIPS_DCACHE_ON 0x0
SLPM_655.14 PARAM_MIPS_DCACHE_ON 0x0
SLPM_656.89 PARAM_MIPS_DCACHE_ON 0x0
SLPM_657.97 PARAM_CPU_DELAY 0x60e
SLPM_658.13 PARAM_MIPS_DCACHE_ON 0x0
SLPM_658.68 PARAM_MIPS_DCACHE_ON 0x0
SLPM_660.57 PARAM_MIPS_DCACHE_ON 0x0
SLPM_660.92 PARAM_MIPS_DCACHE_ON 0x0
SLPM_665.01 PARAM_CPU_DELAY 0x190
SLPM_665.01 PARAM_MIPS_DCACHE_ON 0x0
SLPM_675.28 PARAM_MIPS_DCACHE_ON 0x0
SLPM_685.09 PARAM_MIPS_DCACHE_ON 0x0
SLPM_744.11 PARAM_CPU_DELAY 0xbb8
SLPM_744.11 PARAM_MIPS_DCACHE_ON 0x0
SLPS_200.07 PARAM_CPU_DELAY 0xa28
SLPS_200.07 PARAM_MIPS_DCACHE_ON 0x0
SLPS_200.08 PARAM_MIPS_DCACHE_ON 0x0
SLPS_200.35 PARAM_MIPS_DCACHE_ON 0x0
SLPS_200.36 PARAM_CPU_DELAY 0xbb8
SLPS_200.36 PARAM_MIPS_DCACHE_ON 0x0
SLPS_200.38 PARAM_MIPS_DCACHE_ON 0x0
SLPS_200.46 PARAM_MIPS_DCACHE_ON 0x0
SLPS_200.51 PARAM_MIPS_DCACHE_ON 0x0
SLPS_200.80 PARAM_CACHE_FLASH_CHANNELS 0x0
SLPS_200.80 PARAM_CPU_DELAY 0xfa0
SLPS_200.81 PARAM_CACHE_FLASH_CHANNELS 0x0
SLPS_200.81 PARAM_CPU_DELAY 0xfa0
SLPS_200.91 PARAM_MIPS_DCACHE_ON 0x0
SLPS_201.00 PARAM_CACHE_FLASH_CHANNELS 0x0
SLPS_201.00 PARAM_CPU_DELAY 0xa28
SLPS_201.12 PARAM_MIPS_DCACHE_ON 0x0
SLPS_201.20 PARAM_DMAC_CH10_INT_DELAY_DPC 0x64
SLPS_201.28 PARAM_MIPS_DCACHE_ON 0x0
SLPS_201.29 PARAM_MIPS_DCACHE_ON 0x0
SLPS_201.56 PARAM_MIPS_DCACHE_ON 0x0
SLPS_201.58 PARAM_MIPS_DCACHE_ON 0x0
SLPS_201.84 PARAM_CPU_DELAY 0x9c4
SLPS_201.84 PARAM_MIPS_DCACHE_ON 0x0
SLPS_201.87 PARAM_MIPS_DCACHE_ON 0x0
SLPS_201.92 PARAM_MIPS_DCACHE_ON 0x0
SLPS_202.11 PARAM_MIPS_DCACHE_ON 0x0
SLPS_202.13 PARAM_MIPS_DCACHE_ON 0x0
SLPS_202.29 PARAM_MIPS_DCACHE_ON 0x0
SLPS_202.33 PARAM_MIPS_DCACHE_ON 0x0
SLPS_202.79 PARAM_MIPS_DCACHE_ON 0x0
SLPS_202.96 PARAM_MIPS_DCACHE_ON 0x0
SLPS_202.98 PARAM_MIPS_DCACHE_ON 0x0
SLPS_203.16 PARAM_MIPS_DCACHE_ON 0x0
SLPS_203.61 PARAM_MIPS_DCACHE_ON 0x0
SLPS_203.79 PARAM_CPU_DELAY 0x9c4
SLPS_203.79 PARAM_MIPS_DCACHE_ON 0x0
SLPS_203.90 PARAM_MIPS_DCACHE_ON 0x0
SLPS_204.11 PARAM_MIPS_DCACHE_ON 0x0
SLPS_204.12 PARAM_MIPS_DCACHE_ON 0x0
SLPS_250.08 PARAM_CPU_DELAY 0xbb8
SLPS_250.08 PARAM_MIPS_DCACHE_ON 0x0
SLPS_250.12 PARAM_CPU_DELAY 0xbb8
SLPS_250.12 PARAM_MIPS_DCACHE_ON 0x0
SLPS_250.21 PARAM_MIPS_DCACHE_ON 0x0
SLPS_250.22 PARAM_MIPS_DCACHE_ON 0x0
SLPS_250.68 PARAM_MIPS_DCACHE_ON 0x0
SLPS_250.69 PARAM_CPU_DELAY 0x596
SLPS_250.71 PARAM_CPU_DELAY 0xb60
SLPS_250.71 PARAM_MIPS_DCACHE_ON 0x0
SLPS_250.72 PARAM_CPU_DELAY 0xb60
SLPS_250.72 PARAM_MIPS_DCACHE_ON 0x0
SLPS_250.79 PARAM_CACHE_FLASH_CHANNELS 0x10
SLPS_250.79 PARAM_CPU_DELAY 0xc80
SLPS_250.79 PARAM_DMAC_CH10_INT_DELAY 0x3e8
SLPS_251.21 PARAM_MIPS_DCACHE_ON 0x0
SLPS_251.25 PARAM_MIPS_DCACHE_ON 0x0
SLPS_251.28 PARAM_MIPS_DCACHE_ON 0x0
SLPS_251.29 PARAM_MIPS_DCACHE_ON 0x0
SLPS_251.43 PARAM_MIPS_DCACHE_ON 0x0
SLPS_251.58 PARAM_MIPS_DCACHE_ON 0x0
SLPS_252.02 PARAM_MIPS_DCACHE_ON 0x0
SLPS_252.05 PARAM_MIPS_DCACHE_ON 0x0
SLPS_252.06 PARAM_MIPS_DCACHE_ON 0x0
SLPS_252.40 PARAM_MIPS_DCACHE_ON 0x0
SLPS_252.41 PARAM_MIPS_DCACHE_ON 0x0
SLPS_252.42 PARAM_MIPS_DCACHE_ON 0x0
SLPS_252.43 PARAM_MIPS_DCACHE_ON 0x0
SLPS_252.56 PARAM_MIPS_DCACHE_ON 0x0
SLPS_252.58 PARAM_MIPS_DCACHE_ON 0x0
SLPS_252.59 PARAM_MIPS_DCACHE_ON 0x0
SLPS_252.60 PARAM_MIPS_DCACHE_ON 0x0
SLPS_252.71 PARAM_MIPS_DCACHE_ON 0x0
SLPS_253.12 PARAM_MIPS_DCACHE_ON 0x0
SLPS_253.27 PARAM_MIPS_DCACHE_ON 0x0
SLPS_254.06 PARAM_CPU_DELAY 0xc80
SLPS_254.06 PARAM_DMAC_CH10_INT_DELAY 0x190
SLPS_254.06 PARAM_MIPS_DCACHE_ON 0x0
SLPS_254.65 PARAM_MIPS_DCACHE_ON 0x0
SLPS_255.10 PARAM_MIPS_DCACHE_ON 0x0
SLUS_200.02 PARAM_CPU_DELAY 0xbb8
SLUS_200.11 PARAM_CPU_DELAY 0xbb8
SLUS_200.11 PARAM_MIPS_DCACHE_ON 0x0
SLUS_200.42 PARAM_MIPS_DCACHE_ON 0x0
SLUS_201.13 PARAM_CPU_DELAY 0xa28
SLUS_201.13 PARAM_MIPS_DCACHE_ON 0x0
SLUS_201.86 PARAM_CPU_DELAY 0xc80
SLUS_201.86 PARAM_MIPS_DCACHE_ON 0x0
SLUS_202.67 PARAM_MIPS_DCACHE_ON 0x0
SLUS_204.25 PARAM_CPU_DELAY 0x2134
SLUS_204.53 PARAM_CPU_DELAY 0x618
SLUS_205.37 PARAM_CPU_DELAY 0x1db0
SLUS_205.37 PARAM_DMAC_CH10_INT_DELAY 0x3e8
SLUS_205.37 PARAM_MIPS_DCACHE_ON 0x0
SLUS_205.62 PARAM_MIPS_DCACHE_ON 0x0
SLUS_205.63 PARAM_MIPS_DCACHE_ON 0x0
SLUS_205.64 PARAM_MIPS_DCACHE_ON 0x0
SLUS_205.77 PARAM_MIPS_DCACHE_ON 0x0
SLUS_206.05 PARAM_CPU_DELAY 0xbb8
SLUS_206.05 PARAM_MIPS_DCACHE_ON 0x0
SLUS_206.64 PARAM_CPU_DELAY 0x960
SLUS_206.64 PARAM_MIPS_DCACHE_ON 0x0
SLUS_206.95 PARAM_CACHE_FLASH_CHANNELS 0x0
SLUS_206.95 PARAM_CPU_DELAY 0xfa0
SLUS_206.95 PARAM_DMAC_CH10_INT_DELAY 0x708
SLUS_206.96 PARAM_MIPS_DCACHE_ON 0x0
SLUS_207.19 PARAM_CPU_DELAY 0x618
SLUS_207.63 PARAM_CPU_DELAY 0x960
SLUS_207.63 PARAM_MIPS_DCACHE_ON 0x0
SLUS_209.20 PARAM_MIPS_DCACHE_ON 0x0
SLUS_210.46 PARAM_MIPS_DCACHE_ON 0x0
SLUS_210.57 PARAM_MIPS_DCACHE_ON 0x0
SLUS_210.59 PARAM_MIPS_DCACHE_ON 0x0

2.50 ROM database

2.50 ROM
GAME PARAM VALUE
PAPX_905.17 PARAM_MIPS_DCACHE_ON 0x0
SCAJ_200.04 PARAM_MIPS_DCACHE_ON 0x0
SCAJ_200.24 PARAM_MIPS_DCACHE_ON 0x0
SCAJ_201.25 PARAM_CPU_DELAY 0x780
SCAJ_201.25 PARAM_MIPS_DCACHE_ON 0x0
SCAJ_201.26 PARAM_CPU_DELAY 0x780
SCAJ_201.26 PARAM_MIPS_DCACHE_ON 0x0
SCES_500.00 PARAM_CPU_DELAY 0xbb8
SCES_532.02 PARAM_CPU_DELAY 0x780
SCES_532.02 PARAM_MIPS_DCACHE_ON 0x0
SCKA_200.49 PARAM_CPU_DELAY 0x780
SCKA_200.49 PARAM_MIPS_DCACHE_ON 0x0
SCPS_110.13 PARAM_MIPS_DCACHE_ON 0x0
SCPS_150.33 PARAM_MIPS_DCACHE_ON 0x0
SCPS_150.39 PARAM_MIPS_DCACHE_ON 0x0
SCPS_550.29 PARAM_MIPS_DCACHE_ON 0x0
SCPS_550.42 PARAM_MIPS_DCACHE_ON 0x0
SCPS_550.48 PARAM_MIPS_DCACHE_ON 0x0
SCUS_971.33 PARAM_MIPS_DCACHE_ON 0x0
SCUS_971.67 PARAM_CACHE_FLASH_CHANNELS 0x0
SCUS_971.67 PARAM_CPU_DELAY 0xe10
SCUS_972.64 PARAM_MIPS_DCACHE_ON 0x0
SCUS_972.75 PARAM_MIPS_DCACHE_ON 0x0
SCUS_974.01 PARAM_MIPS_DCACHE_ON 0x0
SCUS_974.02 PARAM_CPU_DELAY 0x780
SCUS_974.02 PARAM_MIPS_DCACHE_ON 0x0
SLES_500.30 PARAM_MIPS_DCACHE_ON 0x0
SLES_500.62 PARAM_CPU_DELAY 0xbb8
SLES_500.62 PARAM_MIPS_DCACHE_ON 0x0
SLES_500.73 PARAM_CPU_DELAY 0xa28
SLES_500.73 PARAM_MIPS_DCACHE_ON 0x0
SLES_504.35 PARAM_CACHE_FLASH_CHANNELS 0x0
SLES_504.43 PARAM_MIPS_DCACHE_ON 0x0
SLES_506.86 PARAM_MIPS_DCACHE_ON 0x0
SLES_510.56 PARAM_MIPS_DCACHE_ON 0x0
SLES_510.57 PARAM_MIPS_DCACHE_ON 0x0
SLES_512.98 PARAM_CPU_DELAY 0x1db0
SLES_512.98 PARAM_DMAC_CH10_INT_DELAY 0x3e8
SLES_512.98 PARAM_MIPS_DCACHE_ON 0x0
SLES_513.03 PARAM_MIPS_DCACHE_ON 0x0
SLES_513.55 PARAM_CPU_DELAY 0xbb8
SLES_513.55 PARAM_MIPS_DCACHE_ON 0x0
SLES_514.25 PARAM_MIPS_DCACHE_ON 0x0
SLES_515.53 PARAM_CACHE_FLASH_CHANNELS 0x0
SLES_515.53 PARAM_CPU_DELAY 0xfa0
SLES_515.53 PARAM_DMAC_CH10_INT_DELAY 0x708
SLES_517.72 PARAM_MIPS_DCACHE_ON 0x0
SLES_519.17 PARAM_CPU_DELAY 0x960
SLES_519.17 PARAM_MIPS_DCACHE_ON 0x0
SLES_519.32 PARAM_MIPS_DCACHE_ON 0x0
SLES_522.14 PARAM_CPU_DELAY 0xaf0
SLES_522.14 PARAM_MIPS_DCACHE_ON 0x0
SLES_522.37 PARAM_MIPS_DCACHE_ON 0x0
SLES_522.65 PARAM_MIPS_DCACHE_ON 0x0
SLES_524.67 PARAM_MIPS_DCACHE_ON 0x0
SLES_524.68 PARAM_MIPS_DCACHE_ON 0x0
SLES_524.69 PARAM_MIPS_DCACHE_ON 0x0
SLES_525.87 PARAM_DMAC_CH10_INT_DELAY 0x5dc
SLES_526.93 PARAM_MIPS_DCACHE_ON 0x0
SLES_527.09 PARAM_MIPS_DCACHE_ON 0x0
SLES_528.11 PARAM_CPU_DELAY 0x1388
SLES_528.45 PARAM_CPU_DELAY 0x2ee0
SLES_528.45 PARAM_DMAC_CH10_INT_DELAY 0x2ee0
SLES_528.45 PARAM_DMAC_CH10_INT_DELAY_DPC 0x2bf20
SLES_528.45 PARAM_MIPS_DCACHE_ON 0x0
SLES_528.61 PARAM_MIPS_DCACHE_ON 0x0
SLKA_250.26 PARAM_CACHE_FLASH_CHANNELS 0x0
SLKA_250.26 PARAM_CPU_DELAY 0xfa0
SLKA_250.26 PARAM_DMAC_CH10_INT_DELAY 0x708
SLKA_250.63 PARAM_MIPS_DCACHE_ON 0x0
SLKA_250.80 PARAM_MIPS_DCACHE_ON 0x0
SLKA_250.84 PARAM_MIPS_DCACHE_ON 0x0
SLKA_251.38 PARAM_MIPS_DCACHE_ON 0x0
SLKA_251.45 PARAM_MIPS_DCACHE_ON 0x0
SLKA_251.46 PARAM_MIPS_DCACHE_ON 0x0
SLKA_251.74 PARAM_MIPS_DCACHE_ON 0x0
SLKA_252.18 PARAM_CPU_DELAY 0xc80
SLKA_252.18 PARAM_DMAC_CH10_INT_DELAY 0x190
SLKA_252.18 PARAM_MIPS_DCACHE_ON 0x0
SLKA_252.34 PARAM_MIPS_DCACHE_ON 0x0
SLKA_252.57 PARAM_MIPS_DCACHE_ON 0x0
SLPM_601.95 PARAM_MIPS_DCACHE_ON 0x0
SLPM_602.04 PARAM_MIPS_DCACHE_ON 0x0
SLPM_602.05 PARAM_MIPS_DCACHE_ON 0x0
SLPM_602.22 PARAM_MIPS_DCACHE_ON 0x0
SLPM_602.23 PARAM_MIPS_DCACHE_ON 0x0
SLPM_610.48 PARAM_CPU_DELAY 0x960
SLPM_610.48 PARAM_MIPS_DCACHE_ON 0x0
SLPM_610.96 PARAM_MIPS_DCACHE_ON 0x0
SLPM_620.77 PARAM_MIPS_DCACHE_ON 0x0
SLPM_620.78 PARAM_MIPS_DCACHE_ON 0x0
SLPM_620.79 PARAM_CPU_DELAY 0x640
SLPM_620.79 PARAM_MIPS_DCACHE_ON 0x0
SLPM_621.19 PARAM_CPU_DELAY 0x622
SLPM_621.25 PARAM_CPU_DELAY 0xfa0
SLPM_621.25 PARAM_MIPS_DCACHE_ON 0x0
SLPM_621.55 PARAM_CPU_DELAY 0x668
SLPM_622.04 PARAM_MIPS_DCACHE_ON 0x0
SLPM_622.05 PARAM_MIPS_DCACHE_ON 0x0
SLPM_622.18 PARAM_MIPS_DCACHE_ON 0x0
SLPM_622.52 PARAM_MIPS_DCACHE_ON 0x0
SLPM_622.54 PARAM_MIPS_DCACHE_ON 0x0
SLPM_622.93 PARAM_MIPS_DCACHE_ON 0x0
SLPM_623.23 PARAM_MIPS_DCACHE_ON 0x0
SLPM_623.29 PARAM_MIPS_DCACHE_ON 0x0
SLPM_623.30 PARAM_MIPS_DCACHE_ON 0x0
SLPM_623.40 PARAM_MIPS_DCACHE_ON 0x0
SLPM_623.73 PARAM_MIPS_DCACHE_ON 0x0
SLPM_623.78 PARAM_CPU_DELAY 0xbb8
SLPM_623.78 PARAM_MIPS_DCACHE_ON 0x0
SLPM_624.08 PARAM_DMAC_CH10_INT_DELAY 0x600
SLPM_625.11 PARAM_MIPS_DCACHE_ON 0x0
SLPM_625.43 PARAM_MIPS_DCACHE_ON 0x0
SLPM_650.10 PARAM_CPU_DELAY 0x190
SLPM_650.10 PARAM_MIPS_DCACHE_ON 0x0
SLPM_650.11 PARAM_MIPS_DCACHE_ON 0x0
SLPM_650.20 PARAM_MIPS_DCACHE_ON 0x0
SLPM_650.21 PARAM_MIPS_DCACHE_ON 0x0
SLPM_650.30 PARAM_CPU_DELAY 0xdac
SLPM_650.30 PARAM_MIPS_DCACHE_ON 0x0
SLPM_650.52 PARAM_MIPS_DCACHE_ON 0x0
SLPM_650.86 PARAM_CPU_DELAY 0xb60
SLPM_650.86 PARAM_MIPS_DCACHE_ON 0x0
SLPM_650.87 PARAM_CPU_DELAY 0xb60
SLPM_650.87 PARAM_MIPS_DCACHE_ON 0x0
SLPM_651.21 PARAM_CPU_DELAY 0x9c4
SLPM_651.21 PARAM_MIPS_DCACHE_ON 0x0
SLPM_651.31 PARAM_MIPS_DCACHE_ON 0x0
SLPM_651.79 PARAM_CPU_DELAY 0xbb8
SLPM_651.79 PARAM_MIPS_DCACHE_ON 0x0
SLPM_652.09 PARAM_CPU_DELAY 0xaf0
SLPM_652.09 PARAM_MIPS_DCACHE_ON 0x0
SLPM_652.34 PARAM_MIPS_DCACHE_ON 0x0
SLPM_652.40 PARAM_CPU_DELAY 0x67c
SLPM_652.46 PARAM_MIPS_DCACHE_ON 0x0
SLPM_652.49 PARAM_CACHE_FLASH_CHANNELS 0x0
SLPM_652.49 PARAM_CPU_DELAY 0xfa0
SLPM_652.49 PARAM_DMAC_CH10_INT_DELAY 0x708
SLPM_652.68 PARAM_MIPS_DCACHE_ON 0x0
SLPM_652.75 PARAM_DMAC_CH10_INT_DELAY 0x600
SLPM_653.08 PARAM_MIPS_DCACHE_ON 0x0
SLPM_653.70 PARAM_CPU_DELAY 0xa28
SLPM_653.70 PARAM_DMAC_CH10_INT_DELAY 0x12c
SLPM_653.70 PARAM_MIPS_DCACHE_ON 0x0
SLPM_653.74 PARAM_MIPS_DCACHE_ON 0x0
SLPM_654.24 PARAM_CACHE_FLASH_CHANNELS 0x0
SLPM_654.24 PARAM_DMAC_CH10_INT_DELAY 0x8ca0
SLPM_654.25 PARAM_CACHE_FLASH_CHANNELS 0x0
SLPM_654.25 PARAM_DMAC_CH10_INT_DELAY 0x8ca0
SLPM_654.38 PARAM_CPU_DELAY 0xaf0
SLPM_654.38 PARAM_MIPS_DCACHE_ON 0x0
SLPM_654.49 PARAM_MIPS_DCACHE_ON 0x0
SLPM_654.59 PARAM_MIPS_DCACHE_ON 0x0
SLPM_655.14 PARAM_MIPS_DCACHE_ON 0x0
SLPM_656.89 PARAM_MIPS_DCACHE_ON 0x0
SLPM_657.97 PARAM_CPU_DELAY 0x60e
SLPM_658.13 PARAM_MIPS_DCACHE_ON 0x0
SLPM_658.16 PARAM_MIPS_DCACHE_ON 0x0
SLPM_658.68 PARAM_MIPS_DCACHE_ON 0x0
SLPM_658.82 PARAM_MIPS_DCACHE_ON 0x0
SLPM_660.22 PARAM_MIPS_DCACHE_ON 0x0
SLPM_660.22 PARAM_MIPS_DCACHE_ON 0x0
SLPM_660.57 PARAM_MIPS_DCACHE_ON 0x0
SLPM_660.92 PARAM_MIPS_DCACHE_ON 0x0
SLPM_665.01 PARAM_CPU_DELAY 0x190
SLPM_665.01 PARAM_MIPS_DCACHE_ON 0x0
SLPM_675.28 PARAM_MIPS_DCACHE_ON 0x0
SLPM_685.09 PARAM_MIPS_DCACHE_ON 0x0
SLPM_744.11 PARAM_CPU_DELAY 0xbb8
SLPM_744.11 PARAM_MIPS_DCACHE_ON 0x0
SLPS_200.07 PARAM_CPU_DELAY 0xa28
SLPS_200.07 PARAM_MIPS_DCACHE_ON 0x0
SLPS_200.08 PARAM_MIPS_DCACHE_ON 0x0
SLPS_200.35 PARAM_MIPS_DCACHE_ON 0x0
SLPS_200.36 PARAM_CPU_DELAY 0xbb8
SLPS_200.36 PARAM_MIPS_DCACHE_ON 0x0
SLPS_200.38 PARAM_MIPS_DCACHE_ON 0x0
SLPS_200.46 PARAM_MIPS_DCACHE_ON 0x0
SLPS_200.51 PARAM_MIPS_DCACHE_ON 0x0
SLPS_200.80 PARAM_CACHE_FLASH_CHANNELS 0x0
SLPS_200.80 PARAM_CPU_DELAY 0xfa0
SLPS_200.81 PARAM_CACHE_FLASH_CHANNELS 0x0
SLPS_200.81 PARAM_CPU_DELAY 0xfa0
SLPS_200.91 PARAM_MIPS_DCACHE_ON 0x0
SLPS_201.00 PARAM_CACHE_FLASH_CHANNELS 0x0
SLPS_201.00 PARAM_CPU_DELAY 0xa28
SLPS_201.12 PARAM_MIPS_DCACHE_ON 0x0
SLPS_201.20 PARAM_DMAC_CH10_INT_DELAY_DPC 0x64
SLPS_201.28 PARAM_MIPS_DCACHE_ON 0x0
SLPS_201.29 PARAM_MIPS_DCACHE_ON 0x0
SLPS_201.56 PARAM_MIPS_DCACHE_ON 0x0
SLPS_201.58 PARAM_MIPS_DCACHE_ON 0x0
SLPS_201.84 PARAM_CPU_DELAY 0x9c4
SLPS_201.84 PARAM_MIPS_DCACHE_ON 0x0
SLPS_201.87 PARAM_MIPS_DCACHE_ON 0x0
SLPS_201.92 PARAM_MIPS_DCACHE_ON 0x0
SLPS_202.11 PARAM_MIPS_DCACHE_ON 0x0
SLPS_202.13 PARAM_MIPS_DCACHE_ON 0x0
SLPS_202.29 PARAM_MIPS_DCACHE_ON 0x0
SLPS_202.33 PARAM_MIPS_DCACHE_ON 0x0
SLPS_202.79 PARAM_MIPS_DCACHE_ON 0x0
SLPS_202.96 PARAM_MIPS_DCACHE_ON 0x0
SLPS_202.98 PARAM_MIPS_DCACHE_ON 0x0
SLPS_203.16 PARAM_MIPS_DCACHE_ON 0x0
SLPS_203.61 PARAM_MIPS_DCACHE_ON 0x0
SLPS_203.79 PARAM_CPU_DELAY 0x9c4
SLPS_203.79 PARAM_MIPS_DCACHE_ON 0x0
SLPS_203.90 PARAM_MIPS_DCACHE_ON 0x0
SLPS_204.11 PARAM_MIPS_DCACHE_ON 0x0
SLPS_204.12 PARAM_MIPS_DCACHE_ON 0x0
SLPS_250.08 PARAM_CPU_DELAY 0xbb8
SLPS_250.08 PARAM_MIPS_DCACHE_ON 0x0
SLPS_250.12 PARAM_CPU_DELAY 0xbb8
SLPS_250.12 PARAM_MIPS_DCACHE_ON 0x0
SLPS_250.21 PARAM_MIPS_DCACHE_ON 0x0
SLPS_250.22 PARAM_MIPS_DCACHE_ON 0x0
SLPS_250.68 PARAM_MIPS_DCACHE_ON 0x0
SLPS_250.69 PARAM_CPU_DELAY 0x596
SLPS_250.71 PARAM_CPU_DELAY 0xb60
SLPS_250.71 PARAM_MIPS_DCACHE_ON 0x0
SLPS_250.72 PARAM_CPU_DELAY 0xb60
SLPS_250.72 PARAM_MIPS_DCACHE_ON 0x0
SLPS_250.79 PARAM_CACHE_FLASH_CHANNELS 0x10
SLPS_250.79 PARAM_CPU_DELAY 0xc80
SLPS_250.79 PARAM_DMAC_CH10_INT_DELAY 0x3e8
SLPS_251.21 PARAM_MIPS_DCACHE_ON 0x0
SLPS_251.25 PARAM_MIPS_DCACHE_ON 0x0
SLPS_251.28 PARAM_MIPS_DCACHE_ON 0x0
SLPS_251.29 PARAM_MIPS_DCACHE_ON 0x0
SLPS_251.43 PARAM_MIPS_DCACHE_ON 0x0
SLPS_251.58 PARAM_MIPS_DCACHE_ON 0x0
SLPS_252.02 PARAM_MIPS_DCACHE_ON 0x0
SLPS_252.05 PARAM_MIPS_DCACHE_ON 0x0
SLPS_252.06 PARAM_MIPS_DCACHE_ON 0x0
SLPS_252.40 PARAM_MIPS_DCACHE_ON 0x0
SLPS_252.41 PARAM_MIPS_DCACHE_ON 0x0
SLPS_252.42 PARAM_MIPS_DCACHE_ON 0x0
SLPS_252.43 PARAM_MIPS_DCACHE_ON 0x0
SLPS_252.56 PARAM_MIPS_DCACHE_ON 0x0
SLPS_252.58 PARAM_MIPS_DCACHE_ON 0x0
SLPS_252.59 PARAM_MIPS_DCACHE_ON 0x0
SLPS_252.60 PARAM_MIPS_DCACHE_ON 0x0
SLPS_252.71 PARAM_MIPS_DCACHE_ON 0x0
SLPS_253.12 PARAM_MIPS_DCACHE_ON 0x0
SLPS_253.27 PARAM_MIPS_DCACHE_ON 0x0
SLPS_254.06 PARAM_CPU_DELAY 0xc80
SLPS_254.06 PARAM_DMAC_CH10_INT_DELAY 0x190
SLPS_254.06 PARAM_MIPS_DCACHE_ON 0x0
SLPS_254.65 PARAM_MIPS_DCACHE_ON 0x0
SLPS_255.10 PARAM_CPU_DELAY 0x780
SLPS_255.10 PARAM_MIPS_DCACHE_ON 0x0
SLUS_200.02 PARAM_CPU_DELAY 0xbb8
SLUS_200.11 PARAM_CPU_DELAY 0xbb8
SLUS_200.11 PARAM_MIPS_DCACHE_ON 0x0
SLUS_200.42 PARAM_MIPS_DCACHE_ON 0x0
SLUS_201.13 PARAM_CPU_DELAY 0xa28
SLUS_201.13 PARAM_MIPS_DCACHE_ON 0x0
SLUS_201.86 PARAM_CPU_DELAY 0xc80
SLUS_201.86 PARAM_MIPS_DCACHE_ON 0x0
SLUS_202.67 PARAM_MIPS_DCACHE_ON 0x0
SLUS_204.25 PARAM_CPU_DELAY 0x2134
SLUS_204.53 PARAM_CPU_DELAY 0x618
SLUS_205.37 PARAM_CPU_DELAY 0x1db0
SLUS_205.37 PARAM_DMAC_CH10_INT_DELAY 0x3e8
SLUS_205.37 PARAM_MIPS_DCACHE_ON 0x0
SLUS_205.62 PARAM_MIPS_DCACHE_ON 0x0
SLUS_205.63 PARAM_MIPS_DCACHE_ON 0x0
SLUS_205.64 PARAM_MIPS_DCACHE_ON 0x0
SLUS_205.77 PARAM_MIPS_DCACHE_ON 0x0
SLUS_206.05 PARAM_CPU_DELAY 0xbb8
SLUS_206.05 PARAM_MIPS_DCACHE_ON 0x0
SLUS_206.64 PARAM_CPU_DELAY 0x960
SLUS_206.64 PARAM_MIPS_DCACHE_ON 0x0
SLUS_206.95 PARAM_CACHE_FLASH_CHANNELS 0x0
SLUS_206.95 PARAM_CPU_DELAY 0xfa0
SLUS_206.95 PARAM_DMAC_CH10_INT_DELAY 0x708
SLUS_206.96 PARAM_MIPS_DCACHE_ON 0x0
SLUS_207.19 PARAM_CPU_DELAY 0x618
SLUS_207.63 PARAM_CPU_DELAY 0x960
SLUS_207.63 PARAM_MIPS_DCACHE_ON 0x0
SLUS_209.20 PARAM_MIPS_DCACHE_ON 0x0
SLUS_210.46 PARAM_MIPS_DCACHE_ON 0x0
SLUS_210.57 PARAM_MIPS_DCACHE_ON 0x0
SLUS_210.59 PARAM_CPU_DELAY 0x780
SLUS_210.59 PARAM_MIPS_DCACHE_ON 0x0

Games with custom XPARAMs on disc

all the following games specify 0x10 0x0 XPARAM (DCACHE_OFF)

ID Game Title
SLPS_256.23 Another Century’s Episode 2 (Japan)
SLPS_255.32 Critical Velocity (Japan)
SLPS_255.56 Hissatsu Pachinko Station V11 (Japan)
SLPM_661.41 Matantei Loki Ragnarok - Mayouga - Ushinawareta Bishou (Japan)
SLPM_627.09 Sega Ages 2500 Series Vol. 23 - Sega Memorial Selection (Japan)
SLPM_663.87 Shin Bakusou Dekotora Densetsu - Tenka Touitsu Choujou Kessen (Japan) (Spike the Best)