Hi
I have a faulty motherboard that does the low beep then a flickering display with the odd cursor character (almost like it's lost vertical sync).
I tried the test rom in place of the OS rom and it boots into the bit test and passes (17 led flashes) then goes into large cursor mode where it displays alternating black and white lines, which seems different than what is expected. after 17 more flashes and a pause it resets to the test.
I've removed the vias, fdd and other roms and it tests the same.
the keyboard and psu have been tested on another machine, and the OS rom swapped and is OK.
anyone got any ideas what might be a likely culprit? something preventing the OS from booting but seemingly not memory related.
I have a faulty motherboard that does the low beep then a flickering display with the odd cursor character (almost like it's lost vertical sync).
I tried the test rom in place of the OS rom and it boots into the bit test and passes (17 led flashes) then goes into large cursor mode where it displays alternating black and white lines, which seems different than what is expected. after 17 more flashes and a pause it resets to the test.
I've removed the vias, fdd and other roms and it tests the same.
the keyboard and psu have been tested on another machine, and the OS rom swapped and is OK.
anyone got any ideas what might be a likely culprit? something preventing the OS from booting but seemingly not memory related.
Statistics: Posted by grobda — Mon Apr 29, 2024 11:54 pm