It was posted for a bit and no one was biting and it was only $10 so I said what the hell and snagged it.
I dumped the ROM for posterity, but I don't know enough about BIOS strings to figure out what board this might be for. But here's the file anyway for anybody interested.
A quick glance lends me to think that it is only half of the data.
as in either the Hi or Lo, Odd or Even part of the bios.
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Yeah, agree. It is 1/2 of a two part Hi/Lo bios.
Hate posting a reply and then have to edit it because it made no sense 😁 First computer was an IBM 3270 workstation with CGA monitor. Stuff: https://archive.org/details/@horun
Yeah... kind of a bummer. Oh well it looks neat. 😜
after looking a bit more at it.
I think it was for a mainboard with an Headland HT-18 chipset. too bad half of it is missing. the mrbios archive is also missing any bios for that chipset.
Right to repair is fundamental. You own it, you're allowed to fix it.
How To Ask Questions The Smart Way
Do not ask Why !
https://www.vogonswiki.com/index.php/Serial_port
Did you validate the eprom is 27128? Looked under the sticker, etc?
Because it might happen that the chip is a variety of 27256, storing both halves of the bios.
Recently I was dumping the dead Realtek VGA card's bios. There are two eprom's, the silkscreen had 27128 text under the sockets, while the actual IC's were two different parts, each is an equivalent of 27256, both filled with odd/even bytes in hi/lo halves of the rom, and the rom with hi sticker had swapped hi/lo halves relative to the rom with lo sticker.
My TL866-II couldn't detect the chip properly, but my GQ-3X detected it as an AMD AM27C256 and I dumped it as that. I can take another look at it tonight, but I'm really reluctant to pull off the sticker to find out. It just looks so damn nice 🤣.
But as a MR. BIOS enjoyer I also want every variant to be out there for the public to be able to try. So I'll check it out again later tonight.
Just say on TL866 software that it is some kind of 27c512 eprom, uncheck 'check ID' option on bottom left corner of Xgrpo program and proceed to read the chip - it will work and won't cause any damage.
keropi wrote on 2023-12-10, 06:25:Just say on TL866 software that it is some kind of 27c512 eprom, uncheck 'check ID' option on bottom left corner of Xgrpo program and proceed to read the chip - it will work and won't cause any damage.
Btw, the 'pin detect' test also might fail, and should be turned off if you don't know the eprom type. It's safe for reading.
One of IC's on that Realtek VGA had failed the pin detect, but did read out totally ok. Idk, maybe it's some low power cmos eprom, while TL866 tried to probe it as ttl, and failed. I didn't want to remove stickers too 😀
Just carefully remove the sticker with a heat gun and tweezers, then put it back on with some new glue/dbl sided tape. It's not a big deal.
I’ve had good luck with razor and heat. Just goes right back on. I don’t fully remove it.
Write model on bottom of chip when done
I would just do what Keropi said and use a random 27C512 do a dump. If it comes out mirrored you know the chips is 32KByte one and half the data really is missing.
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hello, it's not this board https://www.ebay.com/itm/265673467557. I have it at home, but the diagnostic analyzer error code FF --
DamienC wrote on 2023-12-10, 00:06:My TL866-II couldn't detect the chip properly, but my GQ-3X detected it as an AMD AM27C256 and I dumped it as that. I can take another look at it tonight, but I'm really reluctant to pull off the sticker to find out. It just looks so damn nice 🤣.
But as a MR. BIOS enjoyer I also want every variant to be out there for the public to be able to try. So I'll check it out again later tonight.
Try dumping it as the AM27C256 with the TL866 too. If the XGPro software doesn't complain about the chip ID, you got it right. No need to remove the sticker then 😀
If the ID is wrong, you could experiment with the ID check button in the XGPro software after selecting AM27C256 . Haven't tried that function myself, so I really don't know what it does, but with any luck it should give you the actual ID as long as you at least select a chip from the same family with the same pin count (read: 28 pins). It's highly likely it's a 27 or 28, or perhaps even a 29 series one.
Regrettably (?) I'm gone skiing for a week more, not having my hardware available. Could check it out and see what possibilities there are identifying unknown parallell (E)EPROMs once I'm back home if you fail to figure it out yourself.
