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New project: Repro Camputers Lynx

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stephen_usher
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Re: New project: Repro Camputers Lynx

Post by stephen_usher »

The inductances turned up... now I have colour composite video... not very good but it works.

I've now added something the original machine never had... a reset switch. :-)
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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PhilC
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Re: New project: Repro Camputers Lynx

Post by PhilC »

stephen_usher wrote: 02 Apr 2026 22:12 The inductances turned up... now I have colour composite video... not very good but it works.

I've now added something the original machine never had... a reset switch. :-)
How did you fit the reset out of interest.
If it ain't broke, test it to Destruction.
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stephen_usher
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Re: New project: Repro Camputers Lynx

Post by stephen_usher »

PhilC wrote: 02 Apr 2026 22:21
stephen_usher wrote: 02 Apr 2026 22:12 The inductances turned up... now I have colour composite video... not very good but it works.

I've now added something the original machine never had... a reset switch. :-)
How did you fit the reset out of interest.
Merely short the cap in the reset circuit. It uses a cap and a high resistance connected to VCC to delay an input to a gate on a 74LS00 (from memory) which connects to the global reset line. Shorting the cap brings the line down to ground and discharges the cap. Once the switch is opened again the normal reset recharge time starts and once it gets above the TTL trigger threshold the global reset line goes high.
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.
Top
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PhilC
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Re: New project: Repro Camputers Lynx

Post by PhilC »

@stephen_usher good idea as you're using everything that's already on the board and only need the switch. I may be something similar with mine when I do the ram upgrade.
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rubber_jonnie
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Re: New project: Repro Camputers Lynx

Post by rubber_jonnie »

stephen_usher wrote: 02 Apr 2026 22:12 The inductances turned up... now I have colour composite video... not very good but it works.

I've now added something the original machine never had... a reset switch. :-)
Cool, any screenshots? Any idea why the visual quality is poor?
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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Re: New project: Repro Camputers Lynx

Post by stephen_usher »

rubber_jonnie wrote: 03 Apr 2026 10:39
stephen_usher wrote: 02 Apr 2026 22:12 The inductances turned up... now I have colour composite video... not very good but it works.

I've now added something the original machine never had... a reset switch. :-)
Cool, any screenshots? Any idea why the visual quality is poor?
I think that it’s noise on the colour clock.

No pictures at the moment. I’m not at home ‘til Tuesday now.
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.
Top
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rubber_jonnie
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Re: New project: Repro Camputers Lynx

Post by rubber_jonnie »

stephen_usher wrote: 03 Apr 2026 11:57
rubber_jonnie wrote: 03 Apr 2026 10:39

Cool, any screenshots? Any idea why the visual quality is poor?
I think that it’s noise on the colour clock.

No pictures at the moment. I’m not at home ‘til Tuesday now.
Fair enough, enjoy your Easter :)
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: New project: Repro Camputers Lynx

Post by stephen_usher »

rubber_jonnie wrote: 03 Apr 2026 12:46
stephen_usher wrote: 03 Apr 2026 11:57

I think that it’s noise on the colour clock.

No pictures at the moment. I’m not at home ‘til Tuesday now.
Fair enough, enjoy your Easter :)
This is the best output I can get. (It's supposed to be green on black.)

IMG_5032.jpeg

I think that I'm going to have to study the BBC Micro colour composite circuit and see if I can replicate it, by-passing the on-board circuit.
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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.
Top
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rubber_jonnie
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Re: New project: Repro Camputers Lynx

Post by rubber_jonnie »

Oh yeah, that is a bit murky.
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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PhilC
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Re: New project: Repro Camputers Lynx

Post by PhilC »

@stephen_usher my Lynx doesn't have composite out but the RF looks so much better than that. I use it with RGB-Scart and then through my OSC.

Btw, text will only be green on black if you enter the command "TEXT." Otherwise it's White on black and s...l...o...w...
If it ain't broke, test it to Destruction.
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