I found this in an STe.
U211 has the chip visible stacked upon its back, plus the bodges.
Does anyone recognise this mod, and should I keep it?
Modification found in a 520STe : Keep or Cull?
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PeckPeekPoke
- Posts: 68
- Joined: 25 May 2021 19:52
- Location: New England
Modification found in a 520STe : Keep or Cull?
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FOR GREAT JUSTICE. TAKE OUT EVERY ZIG
800xl+U1mb, STfm, STe, 030
800xl+U1mb, STfm, STe, 030
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exxos
- Site Admin

- Posts: 28388
- Joined: 16 Aug 2017 23:19
- Location: UK
Re: Modification found in a 520STe : Keep or Cull?
Same gets asked every few weeks, it's a factory bodge. Later STEs had those 3 chips on the MB. If you look in the motherboards forum for STE motherboards you will see the different revisions of boards.
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rubber_jonnie
- Site Admin

- Posts: 14918
- Joined: 17 Aug 2017 19:40
- Location: Essex
Re: Modification found in a 520STe : Keep or Cull?
Yep, factory bodge, the white glue is a giveaway. Keep it.
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...
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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PeckPeekPoke
- Posts: 68
- Joined: 25 May 2021 19:52
- Location: New England
Re: Modification found in a 520STe : Keep or Cull?
I didn't think of the white glue. The sloppy soldering made it look DIY to me. This must've been one of those jobs done at 4:59PM.
FOR GREAT JUSTICE. TAKE OUT EVERY ZIG
800xl+U1mb, STfm, STe, 030
800xl+U1mb, STfm, STe, 030
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rubber_jonnie
- Site Admin

- Posts: 14918
- Joined: 17 Aug 2017 19:40
- Location: Essex
Re: Modification found in a 520STe : Keep or Cull?
I can't help but think Atari got through a lot of that white hot snot over the ST years :)PeckPeekPoke wrote: 05 Jul 2022 15:21I didn't think of the white glue. The sloppy soldering made it look DIY to me. This must've been one of those jobs done at 4:59PM.
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...
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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ijor
- Posts: 826
- Joined: 30 Nov 2018 20:45
Re: Modification found in a 520STe : Keep or Cull?
Anybody made a schematics about this patch? Or at least is it known what exactly it does?
http://github.com/ijor/fx68k 68000 cycle exact FPGA core
FX CAST Cycle Accurate Atari ST core
http://pasti.fxatari.com
FX CAST Cycle Accurate Atari ST core
http://pasti.fxatari.com
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czietz
- Posts: 586
- Joined: 14 Jan 2018 13:02
Re: Modification found in a 520STe : Keep or Cull?
https://exxosforum.co.uk/forum/viewtopi ... 191#p60191ijor wrote: 06 Jul 2022 02:52 Anybody made a schematics about this patch? Or at least is it known what exactly it does?
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ijor
- Posts: 826
- Joined: 30 Nov 2018 20:45
Re: Modification found in a 520STe : Keep or Cull?
Ah, the DMA sound interrupt. The whole design of that interrupt seems to be a quick patch.czietz wrote: 06 Jul 2022 06:46https://exxosforum.co.uk/forum/viewtopi ... 191#p60191ijor wrote: 06 Jul 2022 02:52 Anybody made a schematics about this patch? Or at least is it known what exactly it does?
Thanks Christian
http://github.com/ijor/fx68k 68000 cycle exact FPGA core
FX CAST Cycle Accurate Atari ST core
http://pasti.fxatari.com
FX CAST Cycle Accurate Atari ST core
http://pasti.fxatari.com
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