| Electronics > Repair |
| What more i can do? |
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| 222Lab_Test222:
--- Quote from: HarryDoPECC on October 30, 2024, 08:19:46 am ---Remove and dump EPROMs, compare Good and bad systems? That said, my hobby involves UVEPROMs that are now 40-50 years old and I’m impressed by how very well they seem to retain data But not too hard to dump and compare, and at least you get backups --- End quote --- How to perform that, i am new to it. Also the EPROM which is used in non working board is ok when used in working board. |
| 222Lab_Test222:
--- Quote from: Harry_22 on October 30, 2024, 09:42:31 am --- --- Quote from: 222Lab_Test222 on October 30, 2024, 07:27:31 am ---this is controller of a machine NOT a motherboard of PC, i am not sure how to press those. --- End quote --- There must be some MMI to setup clock. Could you take a photo of the right side connectors? --- End quote --- here |
| velvia:
EHLO 222Lab_Test222, Is the fourth image where they're getting pulled from? Is this part of an industrial imaging setup? I saw Wacom so I assume imaging/digitizing. If you know what the boards were used for that may help in finding more info, Wacom is going to poison searches since this is a motherboard. Since you checked the battery, it's possible it won't post because of the input power, this is an AT-era board, so despite being a few pins short the power connector is pitched for AT-P8 and AT-P9. I've worked at enough integrators to know that making it look proprietary is almost as good. Triple check your voltages, if it's AT it's expecting -12V and actually needs it, it's also going to want more 5V compared to 12V. Since video has been no dice, it's always possible it's only outputting serial, look for RS232. But that assumes you care about the board, you said you're interested in data recovery and that can be done without a working board; since this is a 486 PC Motherboard you're interested in the three EEPROM chips with printed labels on them as others pointed out. The "MSDOS" pair will be the OS and may contain software, "CGROM" is going to be the character set for the graphics driver (that appears to be unique given all the Wacom in there). Certainly good potential archival material for sure. Not the only way to do it but you can hack together a Rom dumper out of a Pi Pico if you're inclined https://github.com/gfoot/picoprom, same is true for an Arduino Actual data though? That would likely have been spat out to a hard drive not pictured (SCSI?). All of that to say, there's a sanity check I do professionally (but rarely personally): What is the replacement cost / potential value and is that worth more than the amount of time I'm going to invest. If there's limited value in gaining knowledge there: You've got a 486 with a tiny bit of gold and a pile of hard to find spares that are hard to find out how to test ;D 221 Bye, fifty |
| 222Lab_Test222:
--- Quote from: velvia on October 31, 2024, 12:31:56 am ---EHLO 222Lab_Test222, Is the fourth image where they're getting pulled from? Is this part of an industrial imaging setup? I saw Wacom so I assume imaging/digitizing. If you know what the boards were used for that may help in finding more info, Wacom is going to poison searches since this is a motherboard. Since you checked the battery, it's possible it won't post because of the input power, this is an AT-era board, so despite being a few pins short the power connector is pitched for AT-P8 and AT-P9. I've worked at enough integrators to know that making it look proprietary is almost as good. Triple check your voltages, if it's AT it's expecting -12V and actually needs it, it's also going to want more 5V compared to 12V. Since video has been no dice, it's always possible it's only outputting serial, look for RS232. But that assumes you care about the board, you said you're interested in data recovery and that can be done without a working board; since this is a 486 PC Motherboard you're interested in the three EEPROM chips with printed labels on them as others pointed out. The "MSDOS" pair will be the OS and may contain software, "CGROM" is going to be the character set for the graphics driver (that appears to be unique given all the Wacom in there). Certainly good potential archival material for sure. Not the only way to do it but you can hack together a Rom dumper out of a Pi Pico if you're inclined https://github.com/gfoot/picoprom, same is true for an Arduino Actual data though? That would likely have been spat out to a hard drive not pictured (SCSI?). All of that to say, there's a sanity check I do professionally (but rarely personally): What is the replacement cost / potential value and is that worth more than the amount of time I'm going to invest. If there's limited value in gaining knowledge there: You've got a 486 with a tiny bit of gold and a pile of hard to find spares that are hard to find out how to test ;D 221 Bye, fifty --- End quote --- This are the machine which is used to dig underground for the sewage and drainage system. I think the CGROM contains japanese characters hiragana katana kanji, I still couldnt figure out why i am not getting data in address bus of MSDOS, although MSDOS is working fine. |
| velvia:
--- Quote from: 222Lab_Test222 on October 31, 2024, 12:50:17 am ---This are the machine which is used to dig underground for the sewage and drainage system. --- End quote --- So unrelated? Do you know anything about where the board came from? What kind of machine it was pulled out of? --- Quote from: 222Lab_Test222 on October 31, 2024, 12:50:17 am ---I think the CGROM contains japanese characters hiragana katana kanji, I still couldnt figure out why i am not getting data in address bus of MSDOS, although MSDOS is working fine. --- End quote --- If that makes sense for where you sourced the board then that makes sense, 30 years ago you'd certainly need a dedicated ROM for kanji, it may have predated standardization too. Is it "H" or "L" that isn't giving you data? They're both MSDOS :) I don't know much about how MSDOS installs to ROM but they may be "bookends" to the address space and shared with RAM. It's also entirely possible one has failed. |
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