520ST Mod - Help ID'ing Please

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KLund1
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520ST Mod - Help ID'ing Please

Postby KLund1 » Tue Jul 10, 2018 1:43 am

I pulled out a 520st with a 1MB upgrade, but there are parts soldered to the Shifter area I am not sure about. It might be parts of the mem upgrade. This is just outside my wheelhouse of knowledge.
Can someone help ID it?
Thanks :)
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UPDATED: Falcon 030(FX-1)(CF int & removable SD), MSTE 4+PS3000 4160STE 2.06+HDFD STacy4-internal-USD 1040STFM+I.B.Driver-5.25"FDD 1040STF 1040ST 520ST-AdSpeed 400-48k 800+810x2+820+822+825+830+835+850, 800XL+IndusGT 600XL 130XE+XF551x2 Portfolio 1200XL APE(Warp+32in1 OS SuperVideo 2.1 256k RAMBO)+1050x2 USD'd+SIO2PC, PC1+PCH204+PCM124+PCF554x2

SteveBagley
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Re: 520ST Mod - Help ID'ing Please

Postby SteveBagley » Tue Jul 10, 2018 9:22 am

Looks like it is soldered across R113 which means it should have the chroma subcarrier clock frequency on it -- where does the other end of the signal goto inside the modulator tin (the lid should lift up)? That'd probably give a better idea of what it's for.

At a guess, it's either feeding the subcarrier directly to the modulator via screened cable, or it could be a mod to support Genlocking the computer to an external video source (are there any cut tracks around that part of the motherboard?), although I thought that would normally replace the 32MHz clock.

Steve

KLund1
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Re: 520ST Mod - Help ID'ing Please

Postby KLund1 » Thu Jul 12, 2018 6:38 am

Wow, found a lot of additions on the back. I did not see any cut traces.
Also the inside of the RF module.
Could this be a some sort of RF upgrade??
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UPDATED: Falcon 030(FX-1)(CF int & removable SD), MSTE 4+PS3000 4160STE 2.06+HDFD STacy4-internal-USD 1040STFM+I.B.Driver-5.25"FDD 1040STF 1040ST 520ST-AdSpeed 400-48k 800+810x2+820+822+825+830+835+850, 800XL+IndusGT 600XL 130XE+XF551x2 Portfolio 1200XL APE(Warp+32in1 OS SuperVideo 2.1 256k RAMBO)+1050x2 USD'd+SIO2PC, PC1+PCH204+PCM124+PCF554x2

KLund1
Captain Atari
Captain Atari
Posts: 427
Joined: Fri Apr 03, 2009 5:09 pm

Re: 520ST Mod - Help ID'ing Please

Postby KLund1 » Sun Jul 15, 2018 6:57 pm

No suggestions on this mod?
UPDATED: Falcon 030(FX-1)(CF int & removable SD), MSTE 4+PS3000 4160STE 2.06+HDFD STacy4-internal-USD 1040STFM+I.B.Driver-5.25"FDD 1040STF 1040ST 520ST-AdSpeed 400-48k 800+810x2+820+822+825+830+835+850, 800XL+IndusGT 600XL 130XE+XF551x2 Portfolio 1200XL APE(Warp+32in1 OS SuperVideo 2.1 256k RAMBO)+1050x2 USD'd+SIO2PC, PC1+PCH204+PCM124+PCF554x2


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