OSI 600D Superboard Build

Any 8bit repairs, images, cool things, upgrades etc.
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rubber_jonnie
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Re: OSI 600D Superboard Build

Post by rubber_jonnie »

Woo hoo!!

My LS163's just arrived so the 600 should hopefully be back up and running very soon!!
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...
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stephen_usher
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Re: OSI 600D Superboard Build

Post by stephen_usher »

:dualthumbup:
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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rubber_jonnie
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Re: OSI 600D Superboard Build

Post by rubber_jonnie »

And we have video again!!!

IMG20240405113727.jpg
IMG20240405113727.jpg (290.34 KiB) Viewed 4945 times

And I've made a slight tweak to the value in the monitor ROM at $7E0 from 65 to 64, and it's shifted over 1 column left now, which is enough.

A value of 63 is too far, and ideally the value would be 63.5, but we know that's not going to happen.

It's close enough for 24 columns to work.
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...
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stephen_usher
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Joined: Mon Nov 13, 2017 7:19 pm
Location: Oxford, UK.
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Re: OSI 600D Superboard Build

Post by stephen_usher »

Yay! :-)
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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stephen_usher
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Joined: Mon Nov 13, 2017 7:19 pm
Location: Oxford, UK.
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Re: OSI 600D Superboard Build

Post by stephen_usher »

So, next is the tape interface... Remove the cap and see what happens. I dare you. :-)
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.
User avatar
rubber_jonnie
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Re: OSI 600D Superboard Build

Post by rubber_jonnie »

stephen_usher wrote: Fri Apr 05, 2024 2:04 pm So, next is the tape interface... Remove the cap and see what happens. I dare you. :-)
Lol, I already did and it didn't help. I have a concern that my 'scope probe maybe faulty so going to try another. Might just be me being paranoid :)

I also have a test routine that is in the service manual, so going to try that, see what it turns up.
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...
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rubber_jonnie
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Re: OSI 600D Superboard Build

Post by rubber_jonnie »

I've been doing a bit of 'burn in' with the OSI just to try and flush out any more bad IC's, and so far it's looking good :)

Of interest is the power consumption:

IMG20240409124943.jpg
IMG20240409124943.jpg (179.48 KiB) Viewed 4889 times

And that's just for the base machine with 8KB of RAM and not a lot of other stuff. I'm wondering how much extra load the 610 expansion board will add with the extra RAM and FDD interface.

Yep I know the voltage is a bit higher, but well within spec and only set that way so I could check some voltages expected on the cassette circuit. They're low at 5v, and still low at 5.2v, but I'm honestly not sure if it will make much difference to the circuit on account of them being well into the TTL high range even if not the same as the service manual states.

I guess we'll see. Off to set it back to 5v now.

IMG20240409130222.jpg
IMG20240409130222.jpg (177.19 KiB) Viewed 4886 times

There you go :)
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...
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stephen_usher
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Joined: Mon Nov 13, 2017 7:19 pm
Location: Oxford, UK.
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Re: OSI 600D Superboard Build

Post by stephen_usher »

One and a half amps is quite a lot. I wonder what's burning all that electricity.
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.
User avatar
rubber_jonnie
Site Admin
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Posts: 10944
Joined: Thu Aug 17, 2017 7:40 pm
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Re: OSI 600D Superboard Build

Post by rubber_jonnie »

stephen_usher wrote: Tue Apr 09, 2024 1:45 pm One and a half amps is quite a lot. I wonder what's burning all that electricity.
I think, and I'd have to go and check, but the specced PSU in the manual is for 6A, which would give headroom for the 610 to be added. That is with just a simple basic program running that prints out all the available characters on screen then starts again.

I'll see if I can get a thermal pic of what's the hottest :)
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...
User avatar
stephen_usher
Posts: 5900
Joined: Mon Nov 13, 2017 7:19 pm
Location: Oxford, UK.
Contact:

Re: OSI 600D Superboard Build

Post by stephen_usher »

Actually, thinking about it, 1.5A at 5V is only 7.5 watts. It just seems a lot.
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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