Video driver thoughts

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PhilC
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Re: Video driver thoughts

Post by PhilC »

Well done Chris, Is there any further testing you'd like us to carry out with the current board? or should we now wait for the next revision?
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exxos
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Re: Video driver thoughts

Post by exxos »

Forgottenmyname wrote: Fri Nov 30, 2018 12:39 pm Well done Chris, Is there any further testing you'd like us to carry out with the current board? or should we now wait for the next revision?
I don't think there is anything much else to try currently...

You could try adding the 75R resistors in series with the RGB lines and the 47pF caps to see if it makes any difference in video quality at all. ( Note that you may well have 33R already in series).
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Re: Video driver thoughts

Post by exxos »

V3 board if anyone wants to get one made.

VIDEO_DACv3.zip
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Re: Video driver thoughts

Post by kodak80 »

v3 boards ordered from OSH Park. :D

Is there a component list available?
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Re: Video driver thoughts

Post by exxos »

kodak80 wrote: Fri Nov 30, 2018 9:56 pm v3 boards ordered from OSH Park. :D

Is there a component list available?

Code: Select all

Part     Value                Device               Package      Library              Sheet

BLANK                         1,6/0,8              1,6/0,8      wirepad              1
C1       2.2uf                C-EUC0805            C0805        rcl                  1
C2       2.2uf                C-EUC0805            C0805        rcl                  1
C3       50pF                 C-EUC0805            C0805        rcl                  1
C4       50pF                 C-EUC0805            C0805        rcl                  1
C5       50pF                 C-EUC0805            C0805        rcl                  1
C6       2.2uf                C-EUC0805            C0805        rcl                  1
C8       10uf                 C-EUC1206            C1206        rcl                  1
C10      2.2uf                C-EUC0805            C0805        rcl                  1
CN1                           HDR-1X3-MTA-100      MTA-100-3V   con-hdrs40           1
IC1      STV8438CVQFP44_LARGE STV8438CVQFP44_LARGE PQFP44_LARGE Atari_MB_fixed2018v2 1
JP1                           JP2E                 JP2          jumper               1
R1       75                   R-EU_R1206           R1206        rcl                  1
R2       75                   R-EU_R1206           R1206        rcl                  1
R3       75                   R-EU_R1206           R1206        rcl                  1
SHIFTER  SHIFTER              SHIFTER              DIL40        Atari_MB_fixed2018v2 1
STF      SHIFTER              SHIFTER              DIL40        Atari_MB_fixed2018v2 1
v3.png
v3.png (157.15 KiB) Viewed 6838 times

BTW - I already sent your V2 PCB + chip :lol:
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
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Re: Video driver thoughts

Post by kodak80 »

Cool, thank you. I will wait for these to arrive :D
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Re: Video driver thoughts

Post by exxos »

BTW - 50pF can also be 47pF is the value is hard to find. I've not looked for any of the parts yet...
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https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
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Re: Video driver thoughts

Post by kodak80 »

The STV8438CV chip does seem to be very hard to find with Google and non-existent on Mouser.
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Re: Video driver thoughts

Post by PaulJ »

kodak80 wrote: Sat Dec 01, 2018 12:13 am The STV8438CV chip does seem to be very hard to find with Google and non-existent on Mouser.
Here ya go Kodak..
https://www.exdwh.com/data/STV8438CV.pdf
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Re: Video driver thoughts

Post by Icky »

exxos wrote: Fri Nov 30, 2018 1:59 pm V3 board if anyone wants to get one made.
I take it this is just a neater version of the V2.patch board without the large caps.

V2.patch board :)
IMG_3353.png
IMG_3353.png (750.8 KiB) Viewed 6809 times
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