schematic DSP-1, DSP-2, DSP-3, DSP-4
Moderators: B00daW, Moderators
Forum rules
1. NO BLATANT PIRACY. This includes reproducing homebrew less than 10 years old, with the exception of free software.
2. No advertising your reproductions, with the exception of free software.
3. Be nice. See RFC 1855 if you aren't sure what this means.
1. NO BLATANT PIRACY. This includes reproducing homebrew less than 10 years old, with the exception of free software.
2. No advertising your reproductions, with the exception of free software.
3. Be nice. See RFC 1855 if you aren't sure what this means.
schematic DSP-1, DSP-2, DSP-3, DSP-4
Hi,
Can somebody please share schematic for cart :
DSP-1, DSP-2, DSP-3, DSP-4
Can somebody please share schematic for cart :
DSP-1, DSP-2, DSP-3, DSP-4
Re: schematic DSP-1, DSP-2, DSP-3, DSP-4
A while ago I tried to add battery backup to a pirate Mario Kart and this is what I ended with:
https://drive.google.com/folderview?id= ... TVMMjJpLVU
Probably the battery circuit is not correct, the other parts needs to be checked but I think it's mostly fine.
Any corrections and additions are welcome.
Hope it helps.
https://drive.google.com/folderview?id= ... TVMMjJpLVU
Probably the battery circuit is not correct, the other parts needs to be checked but I think it's mostly fine.
Any corrections and additions are welcome.
Hope it helps.
Re: schematic DSP-1, DSP-2, DSP-3, DSP-4
Hi Fisher,Fisher wrote: ↑Tue Mar 23, 2021 6:34 am A while ago I tried to add battery backup to a pirate Mario Kart and this is what I ended with:
https://drive.google.com/folderview?id= ... TVMMjJpLVU
Probably the battery circuit is not correct, the other parts needs to be checked but I think it's mostly fine.
Any corrections and additions are welcome.
Hope it helps.
Yeah , I already saw your pictures
Thank you for sharing with us your project.
I don’t know if there is some equivalent chip to remplace DSP chips?
The price on Aliexpress of original DSP chips is about 10€ For one !
So its become not intresting to do it.
About schematic circuit of DSP games :
I got one original cartridge on Mario Kart at home, I can beep every circuit and see all connections but I thought maybe it’s exist already somewhere.
Re: schematic DSP-1, DSP-2, DSP-3, DSP-4
No, I don't think DSP clone chips exist.
Re: schematic DSP-1, DSP-2, DSP-3, DSP-4
A while ago I saw some "blank" upd77p25d for sale on Aliexpress. I've heard that they're common on some kinds os semaphors.
Unfortunatelly I don't know how ro write these chips neither what files should be used.
There are rumors that the firmware was dumped and is used on Higan (or BSNES?), but I'm not sure if these files can be written as-is to the chip, since they seem to have been obtained by decapping.
But I can be totally wrong and would love to be corrected and learn how to write these chips.
SNES Central has a small article talking about it.
If you take a look at the pictures I shared you'll see that the DSP1 chip used on my pirate carttidge is also a clone with some weird issues that disconnecting some pins seems to have fixed it.
Unfortunatelly I don't know how ro write these chips neither what files should be used.
There are rumors that the firmware was dumped and is used on Higan (or BSNES?), but I'm not sure if these files can be written as-is to the chip, since they seem to have been obtained by decapping.
But I can be totally wrong and would love to be corrected and learn how to write these chips.
Yes, they do.
SNES Central has a small article talking about it.
If you take a look at the pictures I shared you'll see that the DSP1 chip used on my pirate carttidge is also a clone with some weird issues that disconnecting some pins seems to have fixed it.
Re: schematic DSP-1, DSP-2, DSP-3, DSP-4
OMG !Fisher wrote: ↑Wed Mar 24, 2021 2:07 am A while ago I saw some "blank" upd77p25d for sale on Aliexpress. I've heard that they're common on some kinds os semaphors.
Unfortunatelly I don't know how ro write these chips neither what files should be used.
There are rumors that the firmware was dumped and is used on Higan (or BSNES?), but I'm not sure if these files can be written as-is to the chip, since they seem to have been obtained by decapping.
But I can be totally wrong and would love to be corrected and learn how to write these chips.
Yes, they do.
SNES Central has a small article talking about it.
If you take a look at the pictures I shared you'll see that the DSP1 chip used on my pirate carttidge is also a clone with some weird issues that disconnecting some pins seems to have fixed it.
If upd77p25d must be programed before ...
Anyway upd77p25d chip still cost very expensive (for me).
For few games that exist with those chips, it's became not interesting to do it.
I found some info here,
guys made some emulation with dumped files of DSP chips.
https://forums.bannister.org/ubbthreads ... 1&page=all
Re: schematic DSP-1, DSP-2, DSP-3, DSP-4
WOW!
I took a look at Aliexpress and the price is WAY bigger than before.
Fortunatelly EBay seems to have better prices, but not as low as it was.
If I understood correctly the datasheet, the chip should be written just as an ordinary EPROM.
Is it correct?
I took a look at Aliexpress and the price is WAY bigger than before.
Fortunatelly EBay seems to have better prices, but not as low as it was.
If I understood correctly the datasheet, the chip should be written just as an ordinary EPROM.
Is it correct?
Re: schematic DSP-1, DSP-2, DSP-3, DSP-4
Dont know about how to program them.
Have to read more about that.
Re: schematic DSP-1, DSP-2, DSP-3, DSP-4
I forgot to post the datasheet.
Page 29 describes the programming process.
Seems pretty similar to a EPROM to me, maybe with some pins swapped.
Page 29 describes the programming process.
Seems pretty similar to a EPROM to me, maybe with some pins swapped.
- Attachments
-
- UPD77P25D.pdf
- (1.46 MiB) Downloaded 113 times
Re: schematic DSP-1, DSP-2, DSP-3, DSP-4
Looks like Caitsith2 has dumped then and posted here.
Please, keep us updated with your DSP "adventures".
Please, keep us updated with your DSP "adventures".
Re: schematic DSP-1, DSP-2, DSP-3, DSP-4
Great !
Thank you for links.
Yeah, I will keep you update if I will progress
I found uPD77C25C on eBay for good price, but not sure if its can be erased :
https://www.ebay.fr/itm/10pcs-UPD77C25C ... 4965123429
And on Aliexpress uPD77P25D.
Look's like this one can be erasable like any EPROM:
https://fr.aliexpress.com/item/10050012 ... web201603_
Re: schematic DSP-1, DSP-2, DSP-3, DSP-4
The datasheet states that the windowless versions are OTP, the only version being able to be reprogrammed is the windowed one.
It's eraseable with exposure to ultraviolet light with an wavelength shortrt than 400nm, 250nm typical and a power of 1200 μW/cm2, pretty much the same way as an EPROM.
Unless there's a newer version wich supports flash, but I'm not sure if this exists.
It's eraseable with exposure to ultraviolet light with an wavelength shortrt than 400nm, 250nm typical and a power of 1200 μW/cm2, pretty much the same way as an EPROM.
Unless there's a newer version wich supports flash, but I'm not sure if this exists.
Re: schematic DSP-1, DSP-2, DSP-3, DSP-4
Thanks for info.Fisher wrote: ↑Wed Mar 24, 2021 7:06 am The datasheet states that the windowless versions are OTP, the only version being able to be reprogrammed is the windowed one.
It's eraseable with exposure to ultraviolet light with an wavelength shortrt than 400nm, 250nm typical and a power of 1200 μW/cm2, pretty much the same way as an EPROM.
Unless there's a newer version wich supports flash, but I'm not sure if this exists.
I didn't find on eBay windowless versions, only on Ali.
Re: schematic DSP-1, DSP-2, DSP-3, DSP-4
I think the eraseable windowed ones are the way to go, at least until you know exactly what an how to write it.