CPU Strangeness

General discussions or ideas about hardware.
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rubber_jonnie
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Re: CPU Strangeness

Post by rubber_jonnie »

Had a Mega ST2 back in the day, nice machine, would like to get another.
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: CPU Strangeness

Post by PhilC »

I've got 3 at the moment. Upgrading it to 4mb over the week.
If it ain't broke, test it to Destruction.
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rubber_jonnie
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Re: CPU Strangeness

Post by rubber_jonnie »

Sweet.

Upgrading one of my dev boards to 1mb next week when I get the rest of the parts. All smt chips so will be interesting!
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: CPU Strangeness

Post by PhilC »

rubber_jonnie wrote: Sat Apr 27, 2019 9:45 pm Sweet.

Upgrading one of my dev boards to 1mb next week when I get the rest of the parts. All smt chips so will be interesting!
You'll do fine, the pitch of those chips should make it reasonably easy but then I would do it with hot air.
If it ain't broke, test it to Destruction.
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rubber_jonnie
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Re: CPU Strangeness

Post by rubber_jonnie »

Yeah the pitch does lend itself to hand soldering. I may use hot air, not decided yet.
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: CPU Strangeness

Post by PhilC »

Don't forget to post the pics.
If it ain't broke, test it to Destruction.
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rubber_jonnie
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Re: CPU Strangeness

Post by rubber_jonnie »

PhilC wrote: Sat Apr 27, 2019 10:03 pm Don't forget to post the pics.
Already got a post running for that 😁
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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exxos
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Re: CPU Strangeness

Post by exxos »

PhilC wrote: Sat Apr 27, 2019 8:49 pm But seriously, are there any revisions we should avoid and any that we should go look for?
70789 as RJ says. The silly style with cpu near the floppy seem worst. There's so many different versions I can't say they all are bad.. The similar boards with 4 ram chips under the PSU is assume are OK as well. They all kinda have their own quirks . 70789 are the boards I've had the least trouble with. Any revision if it generally seems OK.
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
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rubber_jonnie
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Re: CPU Strangeness

Post by rubber_jonnie »

More strangeness, the C103253 now isn't working with its original CPU in a socket. Frankly bizarre as it was fine a couple of weeks back.

What's more weird, I removed the original CPU and plugged in my PAK68/2, and it fired up right away.

Now I know why Exxos has sleepless nights and all sorts of strange problems trying to get boosters working!
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: CPU Strangeness

Post by PhilC »

Hi RJ,

Try putting some female headers on the CPU and then try it. Maybe the socket is getting a bit fussy about contacts. Have had this problem myself a couple of times
If it ain't broke, test it to Destruction.
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