BIOS FLASHER PROBLEM HELP SUWAT

[dreamcastfix]

Hello friends, I'm having trouble writing the MODEL MX29LV320CTBC-70 BIOS, it is listed as compatible on the dreamshell website, but at the time of erasing it shows the video error below, referring to the datasheet I saw that This chip has a different erasing mode, my question is ... would it be any bios flasher bug? is it possible to upgrade?

Ps>: I used the same circuit and successfully recorded the model mx29lv160dtbi-70 g

[megavolt85]

need screenshot from console

[megavolt85]

oh no, when you get error press START, then B
create photo opened window with log

[dreamcastfix]

(30.07.2019 21:03)megavolt85 писал(а):  oh no, when you get error press START, then B
create photo opened window with log

Nice! I believe it is now right

[megavolt85]

A20 (pin 10) of MX29LV320 need connect to ground

[megavolt85]

pin14 connected to vcc?

[dreamcastfix]

(31.07.2019 01:43)megavolt85 писал(а):  pin14 connected to vcc?

A20 to ground d'ont work

but
I connected the pin A20 (pin 10) to 3V, and now allowed erase! but now it gives the error in writing by 53 percent, follows error picture






Pin 14 its NC, need connect in vcc?

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Pin 14 conected to vcc, the error persists

[dreamcastfix]

When pin 14 is connected to vcc, pin 10 does not change anything if it is in vcc, gnd or NC it allows erase, but the write error remains at the same memory address

[megavolt85]

pin 14 is Write Protect
pin 10 is A20, when connected to vcc you write to last 2MB, if connect to ground then write to first part IC
if you have same error for both parts then damaged IC or bad soldering

[dreamcastfix]

okay, today's tests, pin 14 connected to vcc

pin10 connected to vcc
pin10 connected to gnd

Error persists as per attached image ...

he cannot write to address 0x00110000 (0x02) vs (0x22)

additionally i installed another bios on another console and did the same tests and gave the same error so i eliminated the faulty circuit and the cold solder

In the datasheet, the circuit says that if the address name or value is wrong it stops writing, does that make any sense? could it be that the index that is in the bios flasher is 0x02 and the chip is 0x22? That makes sense? or am i talking bullshit? please correct me

[megavolt85]

need write 0x22 to adress 0x00110000, really writed 0x02