Naomi dimm upgrade GDs

PCB problems and fixes
p1pkin
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Re: Naomi dimm upgrade GDs

Post by p1pkin » March 18th, 2018, 2:11 pm

nem wrote:
p1pkin wrote:you can't software update 1.02, there is only hard way -
https://forum.arcadeotaku.com/viewtopic ... 26&t=29505
Are you 100% sure? I thought it could be done with a bunch of update discs, one incremental update at a time.
I'm 200% sure. 1.x firmwares is totally different system, not VxWorks-based, so its somewhat like lets say trying "update" Linux to Windows ;)
that bunch of update disks exist for updating VxWorks (2.x and later) to some newer version. also there is no need to do it in incremental way, its enough to install latest one.

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nem
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Re: Naomi dimm upgrade GDs

Post by nem » March 18th, 2018, 3:02 pm

Consider me schooled!

Thanks for the info.

aykiri1
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Re: Naomi dimm upgrade GDs

Post by aykiri1 » December 11th, 2018, 2:59 pm

hi

i have naomi 1 with dimm (non netdimm 4.02) .
and i have gd-rom with one GD game with original key chip. (capcom vs snk2 MF 2001)

when after upgraded to 4.02 gd-rom not working.

i made some tests

when i remove cover (error 23 its OK)
when i close cover without disk (error 24 its OK)
when i remove scsi cable (error 25 its OK)
remove key chip also error 26
so gdrom and communicate is normal but black screen
i tested same dimm board with Netdimm doughter board (success)

so i think it cannot be fixable but can be downgrade to 3.XX

my question : can be easy downgrade 3.xx anyway. i tried extract GDS-0023E.chd from mame CHD
how can i use that file for downgrade (force update gd-rom method with hold service button) ?


edit: gds-0023e.chd is corrupted headers and meta's not correct (the file converted chd4 to 5)

p1pkin
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Re: Naomi dimm upgrade GDs

Post by p1pkin » December 16th, 2018, 1:14 am

make sure you set DIMM board jumpers back to GD-boot positions after firmware update via netboot, if you want it to boot from GD/CF again.

if you really want to downgrade firmware: take update binary file (the ones to use via netboot), open it in Hex-editor, change byte at offset 7E0h from 0 to 1, save binary and upload it via netboot to NAOMI.

there was a rumors - if holding Service or Test switch this will enable forced downgrade, but I cant see such key press checks in 3.17 updater code, so its probably just a wrong rumors.

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Re: Naomi dimm upgrade GDs

Post by aykiri1 » December 20th, 2018, 11:40 am

thanks p1pkin for answer

i will downgrade it

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Re: Naomi dimm upgrade GDs

Post by aykiri1 » April 15th, 2019, 2:01 pm

hi p1pkin

7E0h offset value is "2C"
are you sure that adress ?

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Re: Naomi dimm upgrade GDs

Post by aykiri1 » June 29th, 2019, 4:10 pm

any help ?

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