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Upgraded Double Pro Fighter: RAM detected. Games not booting

 
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ackman



Joined: 01 Mar 2019
Posts: 35

PostPosted: Sun Mar 10, 2019 7:18 pm    Post subject: Upgraded Double Pro Fighter: RAM detected. Games not booting Reply with quote

Hi.

I have a Double Pro Fighter 24M version (working), but I would like to expand the memory up to 32 MB.

Anybody knows where to buy two pieces like the one attached?



35016DD0-0CC2-4670-96DD-B9E41279EFE7.jpeg
 Description:
Memory chip
 Filesize:  247.07 KB
 Viewed:  4725 Time(s)

35016DD0-0CC2-4670-96DD-B9E41279EFE7.jpeg




Last edited by ackman on Sat Oct 09, 2021 10:57 am; edited 1 time in total
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DoctorBackup



Joined: 14 Aug 2005
Posts: 265

PostPosted: Mon Mar 11, 2019 8:32 am    Post subject: Reply with quote

You'll have to build it or find a defective one that the ram still works
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ackman



Joined: 01 Mar 2019
Posts: 35

PostPosted: Mon Mar 11, 2019 10:30 am    Post subject: Reply with quote

DoctorBackup wrote:
You'll have to build it or find a defective one that the ram still works


Thank you for your response.
How can I build one of those? I suppose the specs must be the same...


EDIT: I could find almost the same model (UPD424800-70 instead of UPD424800-70L)
https://www.ebay.com/itm/10-Pieces-UPD424800-70-New-Integrated-Circuit-new-Original-NEC/163558305838?hash=item2614d5b02e:g:jIQAAOSw-09aKCV5&frcectupt=true

Anybody knows if I can use 2 of them with my 6 existing UPD424800-70L?

Regards.
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Mystic_Merlin



Joined: 15 Oct 2007
Posts: 496
Location: Bangkok

PostPosted: Wed Mar 13, 2019 9:48 am    Post subject: Reply with quote

I expanded my DPF to 32M with some of those also bought on ebay a while ago.

As long as it's Fast Page 512KBx8Bit no worries
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ackman



Joined: 01 Mar 2019
Posts: 35

PostPosted: Wed Mar 13, 2019 10:43 am    Post subject: Reply with quote

Mystic_Merlin wrote:
I expanded my DPF to 32M with some of those also bought on ebay a while ago.

As long as it's Fast Page 512KBx8Bit no worries


I found the datasheet for UPD424800-70L:
https://datasheet.datasheetarchive.com/originals/scans/Scans-95/DSAIHSC00039854.pdf

And this is the datasheet for UPD424800-70:
https://datasheet.datasheetarchive.com/originals/scans/Scans-95/DSAIHSC00039881.pdf

Both Fast-page and 512KBx8Bit. I think the only difference to get the "L" is the power consumption in stand-by mode (5,5 mW versus 1,1 mW for the "L" version).

I'm in contact with Renesas (new owners of NEC ICs division) to confirm this. But anyway, your comment made me feel confident to buy some of those and expand.

Just place on the board and weld, I suppose.

Regards
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ackman



Joined: 01 Mar 2019
Posts: 35

PostPosted: Mon Aug 02, 2021 6:30 pm    Post subject: Reply with quote

What is the maximum memory I can use with my Double Pro Fighter? It came with 24. I was thinking on expand to 40. Anybody knows if it will work?

Thanks in advance
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MottZilla



Joined: 08 Sep 2004
Posts: 765

PostPosted: Tue Aug 03, 2021 4:10 am    Post subject: Reply with quote

I don't believe the hardware or BIOS was ever designed for over 32 Megabits. While in theory you could put more into it, I'm not sure you'd be able to use it. I've never seen one with more than 32 Megabits. I know there were some other copiers for SNES that had 64 Megabits.
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ackman



Joined: 01 Mar 2019
Posts: 35

PostPosted: Sat Oct 09, 2021 5:05 am    Post subject: Memory upgraded and detected, but games won’t boot Reply with quote

Just upgraded the memory adding two Nec UPD424800-70 memory chips to the existing UPD424800-70L.

Now Double Pro Fighter shows 32 Mb in the main screen, but games don’t boot after loading. Not even those that were working before Crying or Very sad

https://ibb.co/1sb8vQt

Any idea why this is happening?

Thanks in advance
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Mystic_Merlin



Joined: 15 Oct 2007
Posts: 496
Location: Bangkok

PostPosted: Sat Oct 09, 2021 1:47 pm    Post subject: Reply with quote

Probably a bad solder joint or a bad chip, check all your connections.

You can use this program to test your ram, it works on Pro Fighters.
You need to load via floppy drive.

It will show the components U1-U8 with data lines 0-7 and memory addresses 0-9, this way you can find where the issue is.

. = good
? = bad

Be careful if you need to unsolder a chip, use a lot of flux and take your time. Those PCB are low quality and you can easily lift a pad.



Super Wild Card DRAM Test (PD).zip
 Description:

Download
 Filename:  Super Wild Card DRAM Test (PD).zip
 Filesize:  4.97 KB
 Downloaded:  192 Time(s)

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ackman



Joined: 01 Mar 2019
Posts: 35

PostPosted: Sat Oct 09, 2021 9:16 pm    Post subject: Reply with quote

Mystic_Merlin wrote:
Probably a bad solder joint or a bad chip, check all your connections.

You can use this program to test your ram, it works on Pro Fighters.
You need to load via floppy drive.

It will show the components U1-U8 with data lines 0-7 and memory addresses 0-9, this way you can find where the issue is.

. = good
? = bad

Be careful if you need to unsolder a chip, use a lot of flux and take your time. Those PCB are low quality and you can easily lift a pad.


Thank you for your help Mystic_Merlin. I tried to load the tool you posted, but it won’t boot, also converted the file to .fig with uCon64 just in case, but same result Sad

EDIT: I checked the PCB and you were right. There a was a bridge I didn’t notice. I used the DRAM test tool you posted. Everything looks ok https://ibb.co/RYkyPCr

I tried Super Street Fighter 2 and it works Smile

Thanks again! Very Happy
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