dead TT motherboard repair attempt

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jookie
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Re: dead TT motherboard repair attempt

Post by jookie »

Okay, interesting thing... I got a working FPU (68882) from a friend, I've plugged it in the socket and suddenly the TT starts to boot - I can see the Atari logo, memory test.... Then it waits for a long time and ends with 2 bombs, but I'm still missing the DCU (UA01) on motherboard and no floppy or hard drive is connected.

I didn't expect the FPU to be required in TT to boot.

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Steve
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Re: dead TT motherboard repair attempt

Post by Steve »

Wow you're getting close now!!! :)
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stephen_usher
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Re: dead TT motherboard repair attempt

Post by stephen_usher »

I can't remember if TOS 3.06 bombs without a floppy or not. If you have one laying about you could pop one on I imagine.
Intro retro computers since before they were retro...
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.
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Cyprian
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Re: dead TT motherboard repair attempt

Post by Cyprian »

TOS 2.x and 3.x needs floppy drive
Lynx I / Mega ST 1 / 7800 / Portfolio / Lynx II / Jaguar / TT030 / Mega STe / 800 XL / 1040 STe / Falcon030 / 65 XE / 520 STm / SM124 / SC1435
DDD HDD / AT Speed C16 / TF536 / SDrive / PAK68/3 / Lynx Multi Card / LDW Super 2000 / XCA12 / SkunkBoard / CosmosEx / SatanDisk / UltraSatan / USB Floppy Drive Emulator / Eiffel / SIO2PC / Crazy Dots / PAM Net
http://260ste.atari.org
czietz
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Re: dead TT motherboard repair attempt

Post by czietz »

Cyprian wrote: Thu Jul 08, 2021 5:54 pm TOS 2.x and 3.x needs floppy drive
TOS 2.06 does. TOS 3.06 doesn't. Proof: My TT with Atari TOS 3.06 booted to the Desktop without any drives whatsoever:

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Cyprian
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Re: dead TT motherboard repair attempt

Post by Cyprian »

ok, good to know
Lynx I / Mega ST 1 / 7800 / Portfolio / Lynx II / Jaguar / TT030 / Mega STe / 800 XL / 1040 STe / Falcon030 / 65 XE / 520 STm / SM124 / SC1435
DDD HDD / AT Speed C16 / TF536 / SDrive / PAK68/3 / Lynx Multi Card / LDW Super 2000 / XCA12 / SkunkBoard / CosmosEx / SatanDisk / UltraSatan / USB Floppy Drive Emulator / Eiffel / SIO2PC / Crazy Dots / PAM Net
http://260ste.atari.org
czietz
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Re: dead TT motherboard repair attempt

Post by czietz »

jookie wrote: Thu Jul 08, 2021 3:36 pm I didn't expect the FPU to be required in TT to boot.
As the TT was never sold without FPU, the TOS 3 developers did not bother checking for the FPU before using it.
mikro
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Re: dead TT motherboard repair attempt

Post by mikro »

That's even more interesting trivia, thanks czietz.
jookie
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Re: dead TT motherboard repair attempt

Post by jookie »

czietz wrote: Thu Jul 08, 2021 6:22 pm As the TT was never sold without FPU, the TOS 3 developers did not bother checking for the FPU before using it.
Okay, nice to know... This one seems to be sorted out by plugging in the new FPU.
czietz wrote: Thu Jul 08, 2021 6:08 pmTOS 3.06 doesn't. Proof: My TT with Atari TOS 3.06 booted to the Desktop without any drives whatsoever:
So I'll got some other problem, which won't be fixed just by plugging in the floppy...
czietz
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Re: dead TT motherboard repair attempt

Post by czietz »

jookie wrote: Fri Jul 09, 2021 7:53 am So I'll got some other problem, which won't be fixed just by plugging in the floppy...
I did not test this on my TT, but I find it plausible that a missing SCSI DCU might cause a bus error while TOS is trying to boot from SCSI.
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