Tailsnic Retroworks
Professional
Hi. I am experiencing this error on updating to 2011 modbios. Can someone tell me where do I have to look? I have checked every chip and TTL for flying legs
- Thread starter Tailsnic Retroworks
- Start date
ShootTheCore
Legendary
@rester159 is having the same problem with his G-NET board. He’s shipping it to me to look at but my theory is that the flash chip that holds the BIOS is bad.
Tailsnic Retroworks
Professional
What of them is it? For changing it
EDIT: I have seen MAME driver and seems to be U30 28F160. Damn chip, now I have to test it externally
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Tailsnic Retroworks
Professional
Yeah, that says in mame about JP1. Tracing the pin goes to U30 for enabling erase mode
Now to find a TE28F160 replacement...
Now to find a TE28F160 replacement...
Tailsnic Retroworks
Professional
For more info. The 4 x 16mbit tsop56 eeproms Taito G-NET has are INTEL TE28F160, and they are expensive right now.
I have discovered there are other model of tsop56 full compatible and cheaper, SHARP LH28F160S5T-L70A.
I have discovered there are other model of tsop56 full compatible and cheaper, SHARP LH28F160S5T-L70A.
Tailsnic Retroworks
Professional
Changed the flash, still erase error of the screen @ShootTheCore. The error is somewhere else
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ShootTheCore
Legendary
Ugh, that's unfortunate. What if you program the modded BIOS to the flash chip before soldering it to the board so that the board doesn't ever have to reprogram it itself?
Tailsnic Retroworks
Professional
The info that is flashed into the 27c800 is the same when updating the 16mbit tsop?
Yes, should be the same.
Tailsnic Retroworks
Professional
@ShootTheCore Did you archieve to repair that error?
chacal231077
Grand Master
Hi! 
I had already had this problem of flash impossible to flash directly the new chip on my XGECU T56 LH28F160S5T-L70A, as with the chip LH28F160S3T-L10A for the Bios Naomi impossible to program directly, I really need this method because the location of the TSOP 48 and damaged
you need a NOR/Flash 56-TSOP adapter instead of Flash NAND that I can't find
on my side I took this one and it worked in flash mode with M27C800, the jumper J1 configured and everything worked
https://fr.aliexpress.com/item/1005...t_main.20.54005e5bT4xrCE&gatewayAdapt=glo2fra
I had already had this problem of flash impossible to flash directly the new chip on my XGECU T56 LH28F160S5T-L70A, as with the chip LH28F160S3T-L10A for the Bios Naomi impossible to program directly, I really need this method because the location of the TSOP 48 and damaged
you need a NOR/Flash 56-TSOP adapter instead of Flash NAND that I can't find
on my side I took this one and it worked in flash mode with M27C800, the jumper J1 configured and everything worked
https://fr.aliexpress.com/item/1005...t_main.20.54005e5bT4xrCE&gatewayAdapt=glo2fra
Tailsnic Retroworks
Professional
Thanks for the tip. I'll try itHi!
I had already had this problem of flash impossible to flash directly the new chip on my XGECU T56 LH28F160S5T-L70A, as with the chip LH28F160S3T-L10A for the Bios Naomi impossible to program directly, I really need this method because the location of the TSOP 48 and damaged
you need a NOR/Flash 56-TSOP adapter instead of Flash NAND that I can't find
on my side I took this one and it worked in flash mode with M27C800, the jumper J1 configured and everything worked
https://fr.aliexpress.com/item/1005...t_main.20.54005e5bT4xrCE&gatewayAdapt=glo2fra
I'm going to check if it is also the PGM flash, 28F004. I assume is something related to PROGRAM flash and not anything about sound PGM.
Tailsnic Retroworks
Professional
There is no NAND only FLASH, this is from the MAME layout the pgmflash might be the sound code program ?
INTEL_E28F400B(config, "pgmflash"); // U27
INTEL_TE28F160(config, "sndflash0"); // U29
INTEL_TE28F160(config, "sndflash1"); // U55
INTEL_TE28F160(config, "sndflash2"); // U56
INTEL_E28F400B(config, "pgmflash"); // U27
INTEL_TE28F160(config, "sndflash0"); // U29
INTEL_TE28F160(config, "sndflash1"); // U55
INTEL_TE28F160(config, "sndflash2"); // U56
Tailsnic Retroworks
Professional
ShootTheCore
Legendary
The board only just arrived last week. I haven’t had a chance to start on it yet.
ShootTheCore
Legendary
The GNET board that was sent to me for diagnosis successfully updated its BIOS on power up and now works fine booting from generic CF cards - I didn't have to do anything except adjust the 5.0V rail and change the flash jumper.
I suspect that the board's owner was having power supply issues - these boards are touchy about having 5.0V for proper operation. The Sony baseboard also is notorious for leaking capacitors so that could be a factor as well.
Tailsnic Retroworks
Professional
I have tried mine and the flash has perfect +5V, so that's not the problem with this one. Soon I'll have the XGECU T56, I'll try to flash the BIOS manually
