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| blog:386_shootout_forex [2021/03/10 12:06] – [Detailed Problem Images] john | blog:386_shootout_forex [2021/04/20 10:16] (current) – [Initial Testing] john | ||
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| These UMB regions can then be used to load drivers and TSR's high, using the //highdvr// and //hightsr// utility included with The Last Byte memory manager similar to the MS-DOS commands // | These UMB regions can then be used to load drivers and TSR's high, using the //highdvr// and //hightsr// utility included with The Last Byte memory manager similar to the MS-DOS commands // | ||
| + | === BIOS === | ||
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| + | BIOS from my motherboard: | ||
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| + | * {{ : | ||
| ===== Repairs ===== | ===== Repairs ===== | ||
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| 74LS245N pin3 and ISA socket pin2 link wire in place: | 74LS245N pin3 and ISA socket pin2 link wire in place: | ||
| - | TBD | + | {{: |
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| ==== ISA Socket Cleaning ==== | ==== ISA Socket Cleaning ==== | ||
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| I'm pleased with these - other than the one with the missing pin, they' | I'm pleased with these - other than the one with the missing pin, they' | ||
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| + | ===== Initial Testing ===== | ||
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| + | Sadly, initial testing after reassembling the board after replacing the obvious components results in //no video// and //no error code beeps//. Processor and other chips were cold and didn't heat up, indicating no clock signal. | ||
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| + | First thing was to check all of the jumpers on the board, and many of them had been either removed or set to something //other// than what they were supposed to be for a 386DX-40. With those set correctly, and the programmable clock generator set to 40MHz the processor and other supporting chips now get warm, but still no output on screen or via the speaker. | ||
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| + | Next test is probably check with a POST diagnostic card and perhaps check some other clock signals. | ||
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| + | **[Update - 12/ | ||
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| + | After initially having to repair two broken LED's on the __new__ diagnostic card, I eventually got it working and up and running in the Forex board. It confirmed that all voltages were present, and that the system reset behaviour was working, but no error codes are present: | ||
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| + | {{: | ||
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| + | Not sure how to proceed from here..... | ||
| ===== Configuration ===== | ===== Configuration ===== | ||