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REV 3 - REV 5 - The beginning (ST536)

All about the ST536 030 ST booster.
coonsgm
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Re: REV 3 - REV 5 - The beginning (ST536)

Post by coonsgm »

Perfect! All set to make the changes tomorrow.
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exxos
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Re: REV 3 - REV 5 - The beginning (ST536)

Post by exxos »

coonsgm wrote: Fri Nov 28, 2025 10:21 pm Perfect! All set to make the changes tomorrow.
Hopefully it will be a win... We definitely need more wins! :lol:
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Re: REV 3 - REV 5 - The beginning (ST536)

Post by exxos »

If it helps anyone.. This is how I solder the PLD...


coonsgm
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Re: REV 3 - REV 5 - The beginning (ST536)

Post by coonsgm »

Ok first bottom of the board changes and the PLD are done.

Now I have one more question. The SDRAM modification, does it need to be done to both SDRAM IC's?
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Re: REV 3 - REV 5 - The beginning (ST536)

Post by coonsgm »

It looks like my board is an earlier version with some minor changes, but I'm also having a harder time finding which line is to be connected to the SDRAM.
IMG_3894.jpeg
IMG_3894.jpeg (335.75 KiB) Viewed 90 times
IMG_3893.jpeg
IMG_3893.jpeg (272.46 KiB) Viewed 90 times
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exxos
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Re: REV 3 - REV 5 - The beginning (ST536)

Post by exxos »

coonsgm wrote: Sat Nov 29, 2025 5:34 pm It looks like my board is an earlier version with some minor changes, but I'm also having a harder time finding which line is to be connected to the SDRAM.
Which end? You can count the pins on the SDRAM and PLD to see where the wire goes..

The PLD tracks are pointing towards the "50MHz" text..
coonsgm
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Re: REV 3 - REV 5 - The beginning (ST536)

Post by coonsgm »

Could you share a zoomed out photo of the entire board top and bottom? I can't tell from the current photo which corner of the PLD you're looking at.

Thanks!
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Re: REV 3 - REV 5 - The beginning (ST536)

Post by exxos »

coonsgm wrote: Sat Nov 29, 2025 7:07 pm Could you share a zoomed out photo of the entire board top and bottom? I can't tell from the current photo which corner of the PLD you're looking at.
I can but I'm not at home until Tuesday now..
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Re: REV 3 - REV 5 - The beginning (ST536)

Post by coonsgm »

No worries :)
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Re: REV 3 - REV 5 - The beginning (ST536)

Post by coonsgm »

Alright,

I made all the changes:

I connected the 5th pin on the PLD to the 10th pin on the closest SDRAM IC
IMG_3903.jpeg
IMG_3903.jpeg (311.75 KiB) Viewed 53 times
IMG_3906.jpeg
IMG_3906.jpeg (365.04 KiB) Viewed 53 times
Added the 330R to the two pins on the CPU
Connected the two capacitors on the backside
Doubled up all the small birdseed capacitors with 4.7nf's added (dang those are small)
IMG_3904.jpeg
IMG_3904.jpeg (315.88 KiB) Viewed 53 times
IMG_3905.jpeg
IMG_3905.jpeg (192.19 KiB) Viewed 53 times
Programmed the PLD with BETA1SS.jed (photo is an in-process, but it did complete and verify)
IMG_3898.jpeg
IMG_3898.jpeg (362 KiB) Viewed 53 times
It looks like the FastRam is having issues...I've used this ROM before with the 144 and it was mostly stable with FastRam working.
IMG_3901.jpeg
IMG_3901.jpeg (256.29 KiB) Viewed 53 times
IMG_3900.jpeg
IMG_3900.jpeg (254.72 KiB) Viewed 53 times
Ran Gembench, just because (IDE working just fine)
IMG_3902.jpeg
IMG_3902.jpeg (321.46 KiB) Viewed 53 times
I'm sure I did something wrong here, so any feedback is much appreciated!
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