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

Paulo P · Post by **Paulo P** » 18 Jan 2018 18:26

Here are the pictures of my Atari STe motherboard.

IMG_20180118_130655.jpg

IMG_20180118_130749.jpg

Post by **rubber_jonnie** » 25 Jan 2018 11:07

I've seen that wire a couple of times now, I strongly suspect it is a factory 'bodge'.

Post by **exxos** » 25 Jan 2018 11:13

rubber_jonnie wrote: 25 Jan 2018 11:07 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.

Maeke · Post by **Maeke** » 25 Jan 2018 12:52

I have the same wire on my ste.

Post by **rubber_jonnie** » 26 Jan 2018 11:07

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

Paulo P · Post by **Paulo P** » 04 Feb 2018 10:54

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 · Post by **Paulo P** » 18 Apr 2018 17:14

And here are the pictures after recap and some other little improvements (for example, LMC mixer audio fix). More here:

- https://www.exxosforum.co.uk/atari/last/ ... /index.htm ("STE LMC MIXER AUDIO FIX")
- http://forum.8bitchip.info/hardware-16/ ... er'-error/ ("Fixing STE microwire "mixer" error")

Motherboard_after_recap-01.jpg

Motherboard_after_recap-02.jpg

Paulo P · Post by **Paulo P** » 20 Apr 2018 08:58

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?

Post by **exxos** » 20 Apr 2018 09:02

Paulo P wrote: 20 Apr 2018 08:58 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.

Paulo P · Post by **Paulo P** » 20 Apr 2018 09:14

exxos wrote: 20 Apr 2018 09:02
Paulo P wrote: 20 Apr 2018 08:58 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. :)

exxos's Atari, Amiga & retro forum

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

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

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

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

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

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

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

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

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

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

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

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