mario RPG with junk graphics

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amremix
Posts: 2
Joined: Thu Oct 13, 2022 2:12 pm

mario RPG with junk graphics

Post by amremix »

hi everyones
i have a mario rpg that doesn't work! i tried to repair but didnt work
i bought a dontant pcb, it was a kirby stars (JP),
i removed the sdram and maskrom from the mario maker pcb and placed this chips in the kirby board but didn't work because the cinematic intro is showed with bad graphics,
the model of the boards are SHVC-1L5B-10 from mario rpg and SHVC-1L3B-11 from kirby
i dont understand what I need to do
I would appreciate your help
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Yolt1
Posts: 19
Joined: Sun Dec 05, 2021 12:48 am
Location: Brussels, Belgium

Re: mario RPG with junk graphics

Post by Yolt1 »

Hey there,

Just as a reminder Super Mario RPG has a 265K of Ram (1L5B) while Kirby has only 64k (1L3B).
You say you swapped the Maskrom AND the Ram... and that's OK.
But, did you make sure the 1L3B board (which is planned for less Ram) has the necessary wiring to host a 256K RAM chip ?

My guess is : some directions are missing
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Yolt1
Posts: 19
Joined: Sun Dec 05, 2021 12:48 am
Location: Brussels, Belgium

Re: mario RPG with junk graphics

Post by Yolt1 »

To be more explicit

When comparing a 64K ram (of the 1L3B) to a 256k (as in a 1L5B) you'll see that 256K has two additionnal addresses : A14 (pin1) and A13 (pin26)
So, when putting a 256k ram chip on a 1L3B board you need to make sure these pins 1 and 26 are going where they should!

But I must admit, it seems "dum" to have chosen a Kirby 1L3B game to put your Mario RPG in the first place
amremix
Posts: 2
Joined: Thu Oct 13, 2022 2:12 pm

Re: mario RPG with junk graphics

Post by amremix »

Yolt1 wrote: Thu Oct 13, 2022 11:12 pm To be more explicit

When comparing a 64K ram (of the 1L3B) to a 256k (as in a 1L5B) you'll see that 256K has two additionnal addresses : A14 (pin1) and A13 (pin26)
So, when putting a 256k ram chip on a 1L3B board you need to make sure these pins 1 and 26 are going where they should!

But I must admit, it seems "dum" to have chosen a Kirby 1L3B game to put your Mario RPG in the first place
hi the kirby pc is SHVC-1L3B-11 and mario rpg is SHVC-1L5B-11
the kirby have 64k ram with 28 pins and the mario rpg with 256k ram have 28 pins

mario rpg https://snescentral.com/pcblist/pcb_sca ... -front.jpg

kirby https://snescentral.com/0/1/7/0171/SHVC ... t-9617.jpg
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