early 1040 STf two bombs at power on - goes away after warming up

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Lando_C
Captain Atari
Captain Atari
Posts: 186
Joined: Mon Dec 26, 2005 12:31 am
Location: Sweden

early 1040 STf two bombs at power on - goes away after warming up

Postby Lando_C » Fri Feb 23, 2018 10:33 pm

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
Megafile 30
Megafile 60
SM124, SM125, finlux 19 inch TV RGBscart
PC Intel i5 8G ram many disks
5xRaspberry pi

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