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Ok, not much progress here, but I noticed something, so I write it down before I forget. From what I understood from other websites, 29LV640 and 29W640 seem to be programmed the same way via the same adapter. But I'll know more when I desolder the chip. I noticed something when I pluged in the OSCR a cartmod of Tales of Phantasia made with a 29LV640. When I go to SNES repro ExHriom, it has exactly the same codes as the repro: C220 and C20B. When I connect the WE of the 29lv640 to the WE of the cartridge, then the 29lv640 is detected by the OSCR (in the snes repro ExHirom menu). So I suspect that the pcb of the repro prevents from accessing the 29w640. I'll checked again the connexions. |
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Today I noticed that |
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I got a snes repro with a m29w640 instead of a 29lv640. It's a repro of Tales of Phantasia.
I'm not an expert when it comes to datasheet but it seems that the only difference I found between the 2 chips is that the 29w640 has a fast programming mode (but I might be wrong).
I changed the code and put the 29w640 in the 29LV640 group.
When I pluged the cartridge into the OSCR, the chip code detected is C220 and C20B for ExHirom and 83EE and 83A6 for Hirom (I soldered the WE pads and cut the trace between Vcc and WE). Although it should be 20DE or 20DF.
Out of curiosity I tried to detect a 48 pin TSOP 29F160 via the flashrom adapter. The chip is unknown, but good code is detected (018D) by the OSCR.
So whether, flashrom functions work or not, the right code should be detected with a 29w640, if connected correctly to the OSCR, right?
Does it mean there is problem with the board (a bridge to solder or remove for exemple)?
Also, how does the detection of the chip code works?
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