Editing Undocumented SPU Channels

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Seems lv1ldr 3.60+ storing [[Keys#Root_scramble_keys| root scramble key]] with its version to this buffer:
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example for version 3.66:
version:  00 03 00 66 00 00 00 00 00 00 00 00
rootkey:  86    51    28 F7 45 84 59 47 A0 CE
finalbuf: 86 03 51 66 28 F7 45 84 59 47 A0 CE
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== Channels 69, 70, and 71 ==
Performance monitor related. Described in rpcs3 source code. [https://github.com/RPCS3/rpcs3/blob/cf86b6c1072da4491e7a1e9f3f325890a83f6721/rpcs3/Emu/Cell/SPUThread.h#L43 Link]
SPU_Set_Bkmk_Tag    = 69, // Causes an event that can be logged in the performance monitor logic if enabled in the SPU.
                          // ps2_netemu VU1 and PS2-SPU2 spe programs write something to that channel.
SPU_PM_Start_Ev    = 70, // Starts the performance monitor event if enabled
SPU_PM_Stop_Ev      = 71, // Stops the performance monitor event if enabled
spu_rdchcnt() returns 1 for all of them.


== Channel 74 ==
== Channel 74 ==
 
Isolated binaries messing with sb/sc use this channel to get some keygen (?) data from it.
Returns random data. Mostly used as a seed to feed a FIPS 186 PRNG with it.<br>
Official name is CH_RNG
 
Sample data (256 MB):
https://mega.co.nz/#!gNc0hQrR!4rC-Stz5yqi7yqvp6OWOQcxB_XhlrOadoE_fE5fyDxE
 
A bitmap generated from RNG samples:
[[File:Ch74_bitmap.png|200px|A bitmap generated from RNG samples|left|A bitmap generated from RNG samples.]]
 
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