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A little help if your SVI-738 upgrade failed.

Door Tisse

Expert (66)

afbeelding van Tisse

24-08-2022, 15:27

Hi,
I recently upgraded my SVI-738 to MSX2 (changing the VRAM + ROMs)
I totally missed the part that the PCB was double sided and accidentally pulled off almost all pads on the upside of the PCB when I desoldered the RAM-chips and pulled them out rather violently (Yes, I know. Very stupid of me).

So I had to pay the price and make a lot of new patching on the underside instead. It works now, after a lot of extra work.
I just wanted to share my enhanced schematicspage that I used for reference, if anybody else should have any problems after replacing the VRAM-chips.


https://www.jottacloud.com/s/0564247843f284c42a1b9c0ecb36508...
https://www.jottacloud.com/s/0563e0c16b6e26149da8f3115b0851a...
Good luck! :-)

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Van Wierzbowsky

Guardian (3648)

afbeelding van Wierzbowsky

25-08-2022, 18:44

Can't open any of these links.

Van mars2000you

Enlighted (6557)

afbeelding van mars2000you

25-08-2022, 18:50

It works here (Chrome browser).

Van alali.ahmed.t

Master (194)

afbeelding van alali.ahmed.t

25-08-2022, 20:53

It is working with me on chrome too

Van Tisse

Expert (66)

afbeelding van Tisse

26-08-2022, 21:51

If anybody has got a more stable hosting solution, feel free to upload these images and post new links here or on some other pages.

Van Tisse

Expert (66)

afbeelding van Tisse

31-08-2022, 08:27

I just discovered www.msx.pics, so I uploaded the images there instead. Here they are:

Van Wierzbowsky

Guardian (3648)

afbeelding van Wierzbowsky

01-09-2022, 14:19

Wow, impressive fix! Reminds me of upgrading the CBM 4008 to 32kb on a 4-times drilled (at the factory, to prevent RAM upgrade) motherboard.