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do anyone know which CPU Hitachi-HTS543225L9A300 uses?

August 7th, 2019, 2:12

do anyone know which CPU HTS543225L9A300/HTS545025B9A300 or any IBM/Hitachi(M24) uses?

I have the ability to RE FW code.
Once I know the cpu/instruction set of these drives, I will start my research, and post results here.
Many people will benifit from that.

Re: do anyone know which CPU Hitachi-HTS543225L9A300 uses?

August 7th, 2019, 10:26

It's modified Mitsubishi core, no available disassembler for it, no documents either

Re: do anyone know which CPU Hitachi-HTS543225L9A300 uses?

August 7th, 2019, 11:22

hello Doomer, thanks for this valuable info.
can you tell which Mitsubishi core is close to it, part no. etc.
and where you got this info from?

disassembler is not a problem, I can create one.

Re: do anyone know which CPU Hitachi-HTS543225L9A300 uses?

August 7th, 2019, 11:46

genius wrote:hello Doomer, thanks for this valuable info.
can you tell which Mitsubishi core is close to it, part no. etc.
and where you got this info from?

disassembler is not a problem, I can create one.

I don't know which one, I know it's a 24bit core with proprietary opcodes

Re: do anyone know which CPU Hitachi-HTS543225L9A300 uses?

August 7th, 2019, 12:04

Dear Doomer, thanks for your quick reply.
your info is vital and it will point me in right direction.
if you have more info, please keep me updated.

Re: do anyone know which CPU Hitachi-HTS543225L9A300 uses?

August 8th, 2019, 2:02

Well, in the lack of documentation, I have to go the hardest way, figer out opcodes myself.
if anyone have more information about these Mitsubishi cores,
Please share
In return, I will share the results of my research here, and all of you will benifit.
thanks

Re: do anyone know which CPU Hitachi-HTS543225L9A300 uses?

August 8th, 2019, 19:21

Why not devote your effort to current helium models? ISTM that's where the commercial payback will be.

Otherwise, if you're just having fun, see the posts by @eaxi at hddoracle.com. He has done a lot of disassembly for the old Quantum drives, but his techniques, both software and hardware, should prove to be instructive.

Re: do anyone know which CPU Hitachi-HTS543225L9A300 uses?

August 9th, 2019, 8:30

Dear fzabkar,
thanks for your kind suggestion
I will definitely consider that.

Re: do anyone know which CPU Hitachi-HTS543225L9A300 uses?

August 9th, 2019, 8:45

OK, so I started on my own, and got some success.
like 0x2e is an opcode to read memory into a register
much like ldr r0,[r1]
its a 2 byte instruction.
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