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MEGA ST 4 - blank screen boot

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PhilC
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Re: MEGA ST 4 - blank screen boot

Post by PhilC »

@macsonny then your reset circuit is fine.
If it ain't broke, test it to Destruction.
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macsonny
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Re: MEGA ST 4 - blank screen boot

Post by macsonny »

PhilC wrote: 01 Jun 2026 09:44 @macsonny then your reset circuit is fine.
So could it be the MC68901 chip?
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PhilC
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Re: MEGA ST 4 - blank screen boot

Post by PhilC »

macsonny wrote: 01 Jun 2026 11:13
PhilC wrote: 01 Jun 2026 09:44 @macsonny then your reset circuit is fine.
So could it be the MC68901 chip?
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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macsonny
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Re: MEGA ST 4 - blank screen boot

Post by macsonny »

PhilC wrote: 01 Jun 2026 11:47
macsonny wrote: 01 Jun 2026 11:13

So could it be the MC68901 chip?
It could be a lot of things, including dirty or damaged sockets, bad ram chips. Glue mmu etc
I thought bad RAM showed up as a white screen with a black border?
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rubber_jonnie
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Re: MEGA ST 4 - blank screen boot

Post by rubber_jonnie »

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.
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
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