MVS cart replacing defective eproms.

[Misos]

yes, you'd just want to double the ROM file before programming.
however, I'd suspect that the issue is either a cold solder joint, bad projection chip, or a bad C-ROM before the M-ROM is bad.

if you do desolder the M-ROM dump it and verify that's good before replacing it.

What chip should I use to read it? I'm using a Top3000.
27020/27c2001 just read as if the rom is empty.

 

[twistedsymphony]

that would be the correct type.

I don't think I've ever seen a mask rom read blank unless I was doing something wrong with my programmer though.

 

[Misos]

that would be the correct type.

I don't think I've ever seen a mask rom read blank unless I was doing something wrong with my programmer though.

That's weird. Ican read it if I use the 27c040 pinout, for some reason.
The file seem to match the original m1.
Maybe the problem is really the neo cmc.
I hate those pcbs with the custom ics.

 

[twistedsymphony]

yeah on the CHAFIO the S-ROM is distributed across the C-ROMs and the custom decodes it, so if both graphics AND sound have problems then I'd look at the C-ROMS or the custom

 

[Gabouch]

Hello guys,

I bought a Burning fight MVS which has faulty V1 and V2 roms.
I would like to replace them with EPROMs.
Does anyone know what type of eprom to choose and if I can start from a MAME romset or other for programming ?
The original ROMs are HN62408P.

Thank you in advance for your answers

 

[vaughan14]

The roms are 1mb which are 27c800 eproms. Good luck.

The Mame roms should be fine.

 

[Gabouch]

Don't i need to convert the file before program it ?

 

[nem]

No.

 

[Gabouch]

Thank you guys.
I will keep you informed of updates

 

[Gabouch]

Hello guys,

As i said last week, I try to replace V1 and V2 roms (and maybe P1) in a defective MVS Burning Fight.
I choose 27c800 eprom to replace defective maskroms V1 and V2.
My programmer is a Willem GQ-4X V4.
When i open V1 and V2 rom from Mame romset, it ask me to choose setting before programming.
Could you tell me if i need to change something ? File format, Read mode, Fill mode and File offset ?

Thank you in advance for your answers

 

[twistedsymphony]

Could you tell me if i need to change something ? File format, Read mode, Fill mode and File offset ?

You just need to leave them as the default. that will be true of any ROM that came from an original dump like those in MAME.