My 1040 STfg (the one with dual internal floppies..) has started consistently two-bombing when cold. If I leave power on a couple of minutes and reset it, it boots and runs, seemingly stable.
I am powering from a modern ATX supply so hopefully the power is "clean". The original PSU is weak and waiting for recap.
Crystal drift? Oxidizing somewhere?
UK 1040 STF, SE kbd, SE tos 1.04, gotekHxC+floppy B internally, ATX psu on the side
DE Mega 1
SE Mega 2, no keyboard
SE Mega ST 4
Megafile 20 with 2 MFM drive mechanisms (80+20 meg) in hacked case, ATX psu on the side
SM124, SM125, Samsung SyncMaster 930mp 19 inch 4:3 lcd tv rgbscart and VGA for STHIgh
PC Intel i5 8G ram many disks