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General Stuff(tm)

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rubber_jonnie
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Re: General Stuff(tm)

Post by rubber_jonnie »

stephen_usher wrote: Sat Jan 06, 2024 5:15 pm One shift key has an issue with its dome. Good to know that ST ones work, not that I have any spare.

P.S. Just bought one from eBay.
I presume you mean a keyboard dome?

If you need any more I have a few, let me know and I'll post you some.
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: General Stuff(tm)

Post by stephen_usher »

rubber_jonnie wrote: Sat Jan 06, 2024 5:42 pm
I presume you mean a keyboard dome?

If you need any more I have a few, let me know and I'll post you some.
Yeah. I've ordered one from eBay for a fiver (along with a keycap). More would be useful though if you're offering, just in case. :-)
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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Re: General Stuff(tm)

Post by stephen_usher »

Finally got around to opening up the Mega 2 ST I obtained a while ago.

From the date codes it looks like a relatively late mid-1990 machine and someone has already been inside and replaced one of the RAM chips. It'll just need sockets, decoupling caps and chips to bring it up to the full 4MB. No solder in the holes so it'd be easy.
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: General Stuff(tm)

Post by rubber_jonnie »

stephen_usher wrote: Sat Jan 06, 2024 8:24 pm
rubber_jonnie wrote: Sat Jan 06, 2024 5:42 pm
I presume you mean a keyboard dome?

If you need any more I have a few, let me know and I'll post you some.
Yeah. I've ordered one from eBay for a fiver (along with a keycap). More would be useful though if you're offering, just in case. :-)
Let me know how many you need, I have quite a few and key caps too if needed, just PM me.
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: General Stuff(tm)

Post by stephen_usher »

So, on to the next project, upgrading the Mega 2 ST to 4MB.

The 18 pin sockets arrive today, the RAM chips have been ordered from Exxos and I printed out a resistor leg bender tool last night so as to bend the legs of the decoupling caps to the right length. I should be able to get the soldering out of the way tonight and then just plug the chips in when they arrive.
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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HigashiJun
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Re: General Stuff(tm)

Post by HigashiJun »

stephen_usher wrote: Tue Jan 09, 2024 10:23 am So, on to the next project, upgrading the Mega 2 ST to 4MB.

The 18 pin sockets arrive today, the RAM chips have been ordered from Exxos and I printed out a resistor leg bender tool last night so as to bend the legs of the decoupling caps to the right length. I should be able to get the soldering out of the way tonight and then just plug the chips in when they arrive.
That was a good upgrade to my Mega ST.

Really worth it.
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stephen_usher
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Re: General Stuff(tm)

Post by stephen_usher »

Sockets and decoupling caps installed and...


IMG_3531.jpeg
IMG_3531.jpeg (254.65 KiB) Viewed 6794 times

Nothing's broken! 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.
Top
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rubber_jonnie
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Re: General Stuff(tm)

Post by rubber_jonnie »

stephen_usher wrote: Tue Jan 09, 2024 8:43 pm Sockets and decoupling caps installed and...



IMG_3531.jpeg


Nothing's broken! Yay! :-)
Splendid :)
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: General Stuff(tm)

Post by stephen_usher »

Woo-hoo!

I now have the OPD disk interface ROM images!

Interestingly the image is a full 32K but the ROM socket in the schematic is only set up for 16K.
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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stephen_usher
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Posts: 7483
Joined: Mon Nov 13, 2017 7:19 pm
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Re: General Stuff(tm)

Post by stephen_usher »

Got home and quickly wrote the ROM image to an EEPROM, put it into the board, put the board into the ROM slot, connected a Gotek, switched on and...


IMG_3532.jpeg
IMG_3532.jpeg (213.38 KiB) Viewed 1723 times
IMG_3533.jpeg
IMG_3533.jpeg (169.28 KiB) Viewed 1723 times

It only goes and flippin' work first time!
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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