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CO700115 REV. 2 with Piggyback RAM expansi

ST & STM motherboards.
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olivier.jan
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Joined: Mon Jun 01, 2020 8:00 am

CO700115 REV. 2 with Piggyback RAM expansi

Post by olivier.jan »

New toy just arrived from Germany, my first ST (short version) as I only had STF,STE, Mega and Mega STE so far.
IMG_2152.jpeg
IMG_2152.jpeg (269.8 KiB) Viewed 182 times
It seems to be a very early model, the sticker states it’s from May 85 and the components inside all have early dates too.
IMG_2150.jpeg
IMG_2150.jpeg (246.98 KiB) Viewed 182 times
The motherboard is clean and very close to the 2B (with the big white “stuff”), major difference being a ceramic 68000 instead of a plastic one.
IMG_2151.jpeg
IMG_2151.jpeg (549.43 KiB) Viewed 182 times
Hopefully Exxos will resume shipment to EU soon so I can get a proper RAM upgrade to 4MB 8-)
Retro stuff
520 STF/ 1040 STE / Mega ST / 2 Mega STE / 2 H5
2 x 600XL with U1MB /SOFIA 2/ AVG CART / and a few 1050
Apple //c, Commodore 128, Mac Classic, SE/30, LC, IIvi and PB G3 (Clamshell)
Amiga 600 and a few 486 and 386.
Many Nintendo G&W and other electronic games from the late 70s/early 80s.
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DoG
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Re: CO700115 REV. 2 with Piggyback RAM expansi

Post by DoG »

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olivier.jan
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Re: CO700115 REV. 2 with Piggyback RAM expansi

Post by olivier.jan »

DoG wrote: Wed Jan 22, 2025 8:56 pm Or make your own 4Mb board.
Very good idea, I will look into it as soon as I get the ST to work properly. At the moment I can’t get any display.
Retro stuff
520 STF/ 1040 STE / Mega ST / 2 Mega STE / 2 H5
2 x 600XL with U1MB /SOFIA 2/ AVG CART / and a few 1050
Apple //c, Commodore 128, Mac Classic, SE/30, LC, IIvi and PB G3 (Clamshell)
Amiga 600 and a few 486 and 386.
Many Nintendo G&W and other electronic games from the late 70s/early 80s.
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stephen_usher
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Re: CO700115 REV. 2 with Piggyback RAM expansi

Post by stephen_usher »

That's a REALLY early board. Most of the chips have date codes around the 15th week of 1985!

The label on the bottom suggests May 1985, which would tally with the date codes.
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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olivier.jan
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Re: CO700115 REV. 2 with Piggyback RAM expansi

Post by olivier.jan »

Yes, the “youngest” component seems to be the 68000 itself being from the 16th week of 85.
Does anyone knows what is the big white plastic stuff on the motherboard?
Retro stuff
520 STF/ 1040 STE / Mega ST / 2 Mega STE / 2 H5
2 x 600XL with U1MB /SOFIA 2/ AVG CART / and a few 1050
Apple //c, Commodore 128, Mac Classic, SE/30, LC, IIvi and PB G3 (Clamshell)
Amiga 600 and a few 486 and 386.
Many Nintendo G&W and other electronic games from the late 70s/early 80s.
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sporniket
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Re: CO700115 REV. 2 with Piggyback RAM expansi

Post by sporniket »

Most likely the toroidal ferrite core that serves to filter the power rails ? See other revision motherboards.
Steve
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Joined: Fri Sep 15, 2017 11:49 am

Re: CO700115 REV. 2 with Piggyback RAM expansi

Post by Steve »

Very handy that there's no modulator. On my Short-ST I removed the modulator and used that space to install a PicoPSU and a RGBtoHDMI. The Short-ST is an excellent little machine with lots of opportunity, mines running a TF536 with EmuTOS and HDMI output :) 4MB ST-RAM and 64MB TT RAM.
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olivier.jan
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Joined: Mon Jun 01, 2020 8:00 am

Re: CO700115 REV. 2 with Piggyback RAM expansi

Post by olivier.jan »

I really love the form factor of these short STs, never saw a real one before and I’m really happily surprised.
As soon as I get it display a picture, I will upgrade to 4MB and if I can revive one of my ST536(discussed in a different thread), I will definitely install it in this ST.
Retro stuff
520 STF/ 1040 STE / Mega ST / 2 Mega STE / 2 H5
2 x 600XL with U1MB /SOFIA 2/ AVG CART / and a few 1050
Apple //c, Commodore 128, Mac Classic, SE/30, LC, IIvi and PB G3 (Clamshell)
Amiga 600 and a few 486 and 386.
Many Nintendo G&W and other electronic games from the late 70s/early 80s.
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