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ackman
Joined: 01 Mar 2019 Posts: 35
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Posted: Sun Mar 10, 2019 7:18 pm Post subject: Upgraded Double Pro Fighter: RAM detected. Games not booting |
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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?
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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
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Posted: Mon Mar 11, 2019 8:32 am Post subject: |
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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
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Mystic_Merlin
Joined: 15 Oct 2007 Posts: 496 Location: Bangkok
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Posted: Wed Mar 13, 2019 9:48 am Post subject: |
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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
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ackman
Joined: 01 Mar 2019 Posts: 35
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Posted: Mon Aug 02, 2021 6:30 pm Post subject: |
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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
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Posted: Tue Aug 03, 2021 4:10 am Post subject: |
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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
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Posted: Sat Oct 09, 2021 5:05 am Post subject: Memory upgraded and detected, but games won’t boot |
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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
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
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Posted: Sat Oct 09, 2021 1:47 pm Post subject: |
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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.
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Super Wild Card DRAM Test (PD).zip |
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ackman
Joined: 01 Mar 2019 Posts: 35
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Posted: Sat Oct 09, 2021 9:16 pm Post subject: |
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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
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
Thanks again!
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