Kujako
Champion
Anyone know of a good guide to parts for making SOP 40/44 UniBIOS chips for MVS MV1B and MV1C boards? I've been just getting them from aliexpress, but thinking I should start making my own.
MV1B/MV1C BIOS flashing guide?
- Thread starter Kujako
- Start date
Kujako
Champion
Expanding on this... I think the MV1C can use a R27V6402G SOP44 but I'd like confirmation since it's 4MB and ~3.3v. Not sure what the MV1B uses, but they're not interchangeable from my experience. The replacements from aliexpress use a clearly sanded and relabeled chip for the 1B (SP-S3) and for the 1C they use an obfuscated (partial sanding of the label) Toshiba chip. Looking to try and figure out what these are, so I can order in bulk and make my own. Ideally looking for a compatible 1MB SOP40 at 5v (or maybe 3v is fine, no clue).
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Kujako
Champion
I have several, I prefer to replace the chip as my experience with them hasn't been ideal (keeping them secured in place seems to be an ongoing issue). But I get the appeal and agree they are a good option, but for how cheap the replacement pre-flashed chips are I find it easier to go that route, especially since I tend to just remove the stock BIOS when going the Bios Masta route.
Edit: having said that, I'll be installing a Neo BiosMasta this weekend since it looks like one of the pads on this MV1B is damaged. I'm far too lazy to run a new trace and looks like I've got one of the good red/white ones left.
@Neo-Alec do you use hot glue when attaching these? Even with I've had them pop off at inopportune times...
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Kujako
Champion
I think that a MX29F1610 does the trick... 1M word*16 or 2M byte*8 5v read/write. It's 44 pin, but we can ignore the extra 4 from the look of things.
vs
used by SNK.
Not clear why the MV1B and MV1C act differently, but I've mistakenly used a MV1C UniBIOS chip on a MV1B and it didn't post and the ones from aliexpress are clearly different. But will order some and see what I can figure out...
Not clear why the MV1B and MV1C act differently, but I've mistakenly used a MV1C UniBIOS chip on a MV1B and it didn't post and the ones from aliexpress are clearly different. But will order some and see what I can figure out...
No, never needed hot glue. I wouldn't expect that to really help.I have several, I prefer to replace the chip as my experience with them hasn't been ideal (keeping them secured in place seems to be an ongoing issue). But I get the appeal and agree they are a good option, but for how cheap the replacement pre-flashed chips are I find it easier to go that route, especially since I tend to just remove the stock BIOS when going the Bios Masta route.
Edit: having said that, I'll be installing a Neo BiosMasta this weekend since it looks like one of the pads on this MV1B is damaged. I'm far too lazy to run a new trace and looks like I've got one of the good red/white ones left.
@Neo-Alec do you use hot glue when attaching these? Even with I've had them pop off at inopportune times...
How are they popping off? During transport?
avramce
Student
I used an AM29F400BB/BT for all my OMVS builds. Simple lil guide I through together for people that wanted to DIY:
https://imgur.com/a/5gh1Duy
https://imgur.com/a/5gh1Duy
Kujako
Champion
Transport or even storage. Granted, most of the problematic ones are third party. The original ones like the red one I pictured seem far less problematic.
I see. Sounds like a problem with the connector on the third party ones. In my experience with the originals, there's no reason they should come off in storage. I haven't even had a NeoTurfMasta one pop off for any other reason either.