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It's long overdue - Cosmac Elf II build

Blogs & guides and tales of woo by forum members.
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HigashiJun
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Re: It's long overdue - Cosmac Elf II build

Post by HigashiJun »

rubber_jonnie wrote: 05 Apr 2026 11:15 The MK14 was never intended to have a case AFAIK, but it does have feet 😁
Still better than nothing...
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rubber_jonnie
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Re: It's long overdue - Cosmac Elf II build

Post by rubber_jonnie »

HigashiJun wrote: 05 Apr 2026 11:29
rubber_jonnie wrote: 05 Apr 2026 11:15 The MK14 was never intended to have a case AFAIK, but it does have feet 😁
Still better than nothing...
The C1MPF (OSI 600D+OSI 610) also has feet :)

I'll figure something out I'm sure.
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
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rubber_jonnie
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Re: It's long overdue - Cosmac Elf II build

Post by rubber_jonnie »

Well the PCBs for the improved LED display and the CDP1861 replacement have been shipped and should be here in a week :)

Annoyingly none of the stuff I ordered before easter has arrived, so everything is on hold Cosmac wise, though my Atom colour board did arrive on Saturday so I'll have a look through the BoM for that and see what parts I have for it in my spares drawers.
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: It's long overdue - Cosmac Elf II build

Post by rubber_jonnie »

More stuff arrived today:

IMG20260408194331.jpg

Namely the enhanced LED board and the CDP1861 replacement, both here 5 days earlier than shipping predicted :)
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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: It's long overdue - Cosmac Elf II 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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rubber_jonnie
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Re: It's long overdue - Cosmac Elf II build

Post by rubber_jonnie »

OK, so everything is ordered for the CDP1861 replacement, though I have had to go to AliExpress for some parts as the prices for shipping for small items from the likes of Digi-Key, Farnell, RS and the like are really excessive.

I still need some parts for the add on large display, but I had six gorgeous TIL311 displays arrive today:

IMG20260409113606.jpg

Which should look great when all hooked up.
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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: It's long overdue - Cosmac Elf II build

Post by rubber_jonnie »

The whole thing looks very nice :)

IMG20260409124736.jpg

You get a 4 digit memory location display and a 2 digit memory contents display.
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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: It's long overdue - Cosmac Elf II build

Post by rubber_jonnie »

Well I've been finding it difficult to get hold of 16 pin dip resistor packs at 120R, so I made my own:

IMG20260410131821.jpg

Just got to build the 2nd and I can see if we get anything on the original 2 digit display.
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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...
Top
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rubber_jonnie
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Re: It's long overdue - Cosmac Elf II build

Post by rubber_jonnie »

And the display runs :)

IMG20260410133929.jpg

:girldance:

I also get 00 sometimes, but I am still waiting on one of the ICs that control the keyboard so can't go any further just now.

The resistor banks are just there to control LED brightness it seems.
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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...
Top
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stephen_usher
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Re: It's long overdue - Cosmac Elf II 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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