CA4003290 Rev (C300779-001 Rev B 2) 1989 - Atari STe

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Paulo P
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CA4003290 Rev (C300779-001 Rev B 2) 1989 - Atari STe

Post by Paulo P » Thu Jan 18, 2018 6:26 pm

Here are the pictures of my Atari STe motherboard.
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What is this cable for? Does anybody know?
IMG_20180118_130749.jpg (4.06 MiB) Viewed 813 times

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rubber_jonnie
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Re: CA4003290 Rev (C300779-001 Rev B 2) 1989 - Atari STe

Post by rubber_jonnie » Thu Jan 25, 2018 11:07 am

I've seen that wire a couple of times now, I strongly suspect it is a factory 'bodge'.
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: CA4003290 Rev (C300779-001 Rev B 2) 1989 - Atari STe

Post by exxos » Thu Jan 25, 2018 11:13 am

rubber_jonnie wrote:
Thu Jan 25, 2018 11:07 am
I've seen that wire a couple of time now, I strongly suspect it is a factory 'bodge'.
I seen it as well. If someone looked up what pin it was on the IC, then see whats going on better. Think they just added a pull up to a pin as the wire goes to the SIL array.
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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Maeke
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Re: CA4003290 Rev (C300779-001 Rev B 2) 1989 - Atari STe

Post by Maeke » Thu Jan 25, 2018 12:52 pm

I have the same wire on my ste.
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rubber_jonnie
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Re: CA4003290 Rev (C300779-001 Rev B 2) 1989 - Atari STe

Post by rubber_jonnie » Fri Jan 26, 2018 11:07 am

Unless I'm counting wrong, that wire is going to pin 1 of the Shifter.
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

Paulo P
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Joined: Tue Jan 16, 2018 1:22 pm

Re: CA4003290 Rev (C300779-001 Rev B 2) 1989 - Atari STe

Post by Paulo P » Sun Feb 04, 2018 10:54 am

I read somewhere few days ago, that this is for some voltage stability reason. I don't know if this is right or not.

Paulo P
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Joined: Tue Jan 16, 2018 1:22 pm

Re: CA4003290 Rev (C300779-001 Rev B 2) 1989 - Atari STe

Post by Paulo P » Wed Apr 18, 2018 5:14 pm

And here are the pictures after recap by Centurion technologies (https://www.facebook.com/centuriontech.eu) and some other little improvements (for example, LMC mixer audio fix). More here:
- https://www.exxoshost.co.uk/atari/last/ ... /index.htm ("STE LMC MIXER AUDIO FIX")
- http://forum.8bitchip.info/hardware-16/ ... er'-error/ ("Fixing STE microwire "mixer" error")
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Paulo P
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Re: CA4003290 Rev (C300779-001 Rev B 2) 1989 - Atari STe

Post by Paulo P » Fri Apr 20, 2018 8:58 am

I've noticed that one chip on the left of the processor is missing on my board compared to other STe mainboards. Does anybody know, what is it good for?

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exxos
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Re: CA4003290 Rev (C300779-001 Rev B 2) 1989 - Atari STe

Post by exxos » Fri Apr 20, 2018 9:02 am

Paulo P wrote:
Fri Apr 20, 2018 8:58 am
I've noticed that one chip on the left of the processor is missing on my board compared to other STe mainboards. Does anybody know, what is it good for?
Its the blitter... Its integrated in the large SMT chip to the left on later machines.
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.

Paulo P
Posts: 20
Joined: Tue Jan 16, 2018 1:22 pm

Re: CA4003290 Rev (C300779-001 Rev B 2) 1989 - Atari STe

Post by Paulo P » Fri Apr 20, 2018 9:14 am

exxos wrote:
Fri Apr 20, 2018 9:02 am
Paulo P wrote:
Fri Apr 20, 2018 8:58 am
I've noticed that one chip on the left of the processor is missing on my board compared to other STe mainboards. Does anybody know, what is it good for?
Its the blitter... Its integrated in the large SMT chip to the left on later machines.
Thanks very much for your answer. I had a little bad feeling that my board has missing something. :)

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