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 » Sat Apr 27, 2019 9:37 pm

Had a Mega ST2 back in the day, nice machine, would like to get another.
Collector of old Atari things:
800XL + Ape Warp mod, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg) + Gotek, 1040STFM + Vortex ATOnce + Gotek, 1040STF long button floppy, 4160 STE with Gotek and ROM switcher, 4160STE with 32Mhz booster, ROM switcher and CosmosEx, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

PhilC
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Re: CPU Strangeness

Post by PhilC » Sat Apr 27, 2019 9:39 pm

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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Re: CPU Strangeness

Post by rubber_jonnie » 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!
Collector of old Atari things:
800XL + Ape Warp mod, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg) + Gotek, 1040STFM + Vortex ATOnce + Gotek, 1040STF long button floppy, 4160 STE with Gotek and ROM switcher, 4160STE with 32Mhz booster, ROM switcher and CosmosEx, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

PhilC
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Re: CPU Strangeness

Post by PhilC » Sat Apr 27, 2019 9:47 pm

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 » Sat Apr 27, 2019 10:01 pm

Yeah the pitch does lend itself to hand soldering. I may use hot air, not decided yet.
Collector of old Atari things:
800XL + Ape Warp mod, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg) + Gotek, 1040STFM + Vortex ATOnce + Gotek, 1040STF long button floppy, 4160 STE with Gotek and ROM switcher, 4160STE with 32Mhz booster, ROM switcher and CosmosEx, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

PhilC
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Re: CPU Strangeness

Post by PhilC » Sat Apr 27, 2019 10:03 pm

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 » Sat Apr 27, 2019 10:11 pm

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 old Atari things:
800XL + Ape Warp mod, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg) + Gotek, 1040STFM + Vortex ATOnce + Gotek, 1040STF long button floppy, 4160 STE with Gotek and ROM switcher, 4160STE with 32Mhz booster, ROM switcher and CosmosEx, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

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exxos
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Re: CPU Strangeness

Post by exxos » Sun Apr 28, 2019 12:58 am

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.
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/last/storenew/ - All my hardware mods for sale - Please help support by making a purchase.

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Re: CPU Strangeness

Post by rubber_jonnie » Mon May 20, 2019 10:16 am

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 old Atari things:
800XL + Ape Warp mod, 2x 1010 cassette, 1050 + Happy mod, 65XE (128k) & XC12, SIO2SD, 2600jr, 7800 and Lynx II
Atari 520ST (1Meg) + Gotek, 1040STFM + Vortex ATOnce + Gotek, 1040STF long button floppy, 4160 STE with Gotek and ROM switcher, 4160STE with 32Mhz booster, ROM switcher and CosmosEx, not to mention various bare ST boards for testing including a PAK 68/2 :)
Plus the rest..
Amiga stuff, Mac stuff, Sinclair stuff etc...
www.electronicnothingness.co.uk

PhilC
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Re: CPU Strangeness

Post by PhilC » Mon May 20, 2019 10:26 am

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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