Sega Dreamcast mod: Custom bios with switch, Overclock, IDE HDD, and SD

[Rellikami]

I had started on this months ago and just recently had time to finish one up, i have 1 more VA1 console and a VA0 i plan on doing these mods to.

pictures (Click to View)

it is currently running Japanesecake's latest bios with DEV boot and running a copy of dreamshell from SD with the boot cd, all games i have used are running great from a 32GB CF card with external power( could not get my IDE2SATA adapters to work.)
I decided against doing a internal VGA or sound jack mod because space is a premium and finding what i would call a good place to put it without a psu mod is a pain, and the cables are cheap as chips as of recent.
I have this one done even put a new battery and reset-able fuse on the controller board. I only plan to open it up once more because i want to ad a reset button.

I did start on the va0 probably the one i will keep and not sell, i know 3v flash isn't supposed to play well with them, though I wired it up to get power from 3v and it seems to work fine flashes and boots with no issues.

pictures (Click to View)

[fafadou]

No picture of overclock, we I see your weldings, I imagine it was a huge battle.

The va0 have a different system cooler for sh4 and pvr ?

[Rellikami]

(17.06.2018 12:47)fafadou писал(а):  No picture of overclock, we I see your weldings, I imagine it was a huge battle.

The va0 have a different system cooler for sh4 and pvr ?

i have done some horrible things to the internals of other gaming devices.

pictures (Click to View)

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It normally turns out well though!

pictures (Click to View)

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I removed the resistor on the bottom (r331) instead of lifting the pin on the chip. it is much easier to solder to and less risk of breaking a pin.
http://www.acidmods.com/forum/index.php?topic=44162.0


The VA0 has a single blower cooler for both heat sinks with a metal fan and heatpipes, i may try and push past 240Mhz ( maybe 270Mhz?) when i get a chance to work more on it. need to order different oscillators and copper shims the appropriate thickness to replace the cooling pads also might add some extra fans.

I have some decent Va0 pictures for who may want to see the overall internals.

pictures (Click to View)

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[fafadou]

the result in your gameboy is great !

How have you overclock the SH4 finally remove the jumper R331 or the lift the pin of IC305 ?

[Rellikami]

(18.06.2018 18:32)fafadou писал(а):  the result in your gameboy is great !

How have you overclock the SH4 finally remove the jumper R331 or the lift the pin of IC305 ?

I used the jumper, if I ever wanted to undo it i can just remove it and bridge the juper back.
The jumper is much more safe than lifting the pin.