Uh Oh.Electron inbound

Any 8bit repairs, images, cool things, upgrades etc.
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stephen_usher
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Re: Uh Oh.Electron inbound

Post by stephen_usher »

Yay!!!! At last! :-)
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: Uh Oh.Electron inbound

Post by rubber_jonnie »

stephen_usher wrote: Fri Jun 28, 2024 3:42 pm Yay!!!! At last! :-)
Hell yeah!!

I started this thread on 4th June 2021, so fixing it has taken 3 years!!!

:dizzy:

I guess that means I'm persistent...
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: Uh Oh.Electron inbound

Post by rubber_jonnie »

I gave the ULA replacement something harder to play with:

IMG20240628162055.jpg
IMG20240628162055.jpg (251.32 KiB) Viewed 361 times

So far not blown a gasket.
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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HigashiJun
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Re: Uh Oh.Electron inbound

Post by HigashiJun »

Well done !

:D
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rubber_jonnie
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Re: Uh Oh.Electron inbound

Post by rubber_jonnie »

HigashiJun wrote: Sat Jun 29, 2024 12:53 am Well done !

:D
Thank you :)
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...
BennehBoy
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Re: Uh Oh.Electron inbound

Post by BennehBoy »

I guess you need another ELK now to fit that spare ULA to :D
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rubber_jonnie
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Re: Uh Oh.Electron inbound

Post by rubber_jonnie »

BennehBoy wrote: Sat Jun 29, 2024 4:11 pm I guess you need another ELK now to fit that spare ULA to :D
Why, do you have one :)
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: Uh Oh.Electron inbound

Post by rubber_jonnie »

OK, so the replacement ULA thread has been running and running over on Stardot, you can find it here: Mogwaay's ULA replacement and here: Dead Elk

Of interest was the flickery images in turbo mode, fixed by a 33pF capacitor on IC 11, a flip flop that is part of the PAL circuit feeding the modulator and composite and takes a signal from the 17.7345 Mhz oscillator.

IMG20240704130900.jpg
IMG20240704130900.jpg (241.98 KiB) Viewed 194 times

RGB doesn't use this signal and is fine.
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
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Re: Uh Oh.Electron inbound

Post by stephen_usher »

:dualthumbup: :yay2:
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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Joined: Thu Aug 17, 2017 7:40 pm
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Re: Uh Oh.Electron inbound

Post by rubber_jonnie »

And the Electron has stopped displaying red over composite :pullhair:

It isn't the ULA as it happens with both the replacement and the original, however the RGB output is fine, and that derives colour directly from the ULA, and since composite gets colour indirectly from the circuit that provides colour to the modulator.

Since there is blue and green, I suspect that IC15 may have a bad or gate on the red input, so I will start my investigations there.
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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