If the symptom reappears, maybe redo the solder joints.I can only think that one of the chips was not making proper contact even though they were all firmly inserted.
What kind of effect does this have?What about the resistor SIP's? I know of two cases here where the SIP's were installed in the wrong orientation.
Having encountered those symptoms myself, I am very confident that I know the cause.... I am stuck and I would need help on how to "unbrick" my Tandy: My only mean of booting it was thru this compactFlash card.
Thank you deeply, modem7. I in fact was about to write back in this forum because I found and fixed the problem by myself just a minute ago, and you were absolutely correct. My problem came from this note related pertaining to r622:Having encountered those symptoms myself, I am very confident that I know the cause.
Visit [here] and look at the entry that starts with, "I upgraded the release of 2.0.0 Beta 3+"
Symptom | I upgraded the release of 2.0.0 Beta 3+ of the XTIDE Universal BIOS (XUB) on my XT-IDE card to another release. Everything was working before, but now when I boot from the CF, I see "Missing operating system". Sometimes I saw, "Non-System disk or disk error" |
Observation | Booting problem only? I could see that the files are there, and can be read okay (as confirmed by CRC comparisons). |
Example | Upgrading R602 to R622. |
Fix #1 | Using the XTIDECFG program (the one from the particular XUB version that you upgraded to), reconfigure the XTIDE Universal BIOS (XUB), changing the 'CHS translation method' setting to 'Assisted LBA'. XTIDECFG navigation: {Configure XTIDE Universal BIOS} {Primary IDE controller} {Master drive} {CHS translation method} |
Fix #2 | Or, Step 1 - Use FDISK to delete the existing partition. (Or wipe the CF, or wipe the first sector of the CF.) Step 2 - Redo the partitioning and formatting of the CF (example at here). |
Fix #3 | Or, restore the XUB release to what it was. |
Cause | Reference: The 'Changes' section of here. The behaviour is due to a bug fix that was implemented in release R606. Per the reference, it affects drives with a cylinder count less than or equal to 1024. |
Down the track, the XUB in the XT-IDE's EEPROM could get corrupted. So it good to have ready, a DOS boot floppy with XTIDECFG.EXE and IDE_XT.BIN on it (in your case, those from R625).To fix my problem, I had to ...