Can all registered uses please login, even just for a few minutes..
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It helps build a picture where our "good traffic" is coming from..
Thanks :)
MEGA ST 4 - blank screen boot
Re: MEGA ST 4 - blank screen boot
@macsonny then your reset circuit is fine.
If it ain't broke, test it to Destruction.
Re: MEGA ST 4 - blank screen boot
So could it be the MC68901 chip?
Re: MEGA ST 4 - blank screen boot
It could be a lot of things, including dirty or damaged sockets, bad ram chips. Glue mmu etc
If it ain't broke, test it to Destruction.
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rubber_jonnie
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Re: MEGA ST 4 - blank screen boot
Typically no RAM shows as a black screen with a white border. bad RAM may show up as on screen corruption dependent on where the bad RAM is.
A fully white screen generally means a ROM issue.
However I would add that these rules are not 100% set in stone, though they are generally sound.
A fully white screen generally means a ROM issue.
However I would add that these rules are not 100% set in stone, though they are generally sound.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...