Granlunds FrankenSTein

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Icky
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Re: Granlunds FrankenSTein

Post by Icky »

agranlund wrote: Fri Oct 23, 2020 11:59 pm I believe the Phoenix Sparkalaphobia is slightly larger than a normal blitter so I might need to move that PLCC socket somewhat to make sure the Phoenix blitter also fits.
@agranlund - have sent over the dimensions of the Phoenix Sparkalaphobia to help with placement.
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agranlund
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Re: Granlunds FrankenSTein

Post by agranlund »

DoG wrote: Sat Oct 24, 2020 2:11 am Ooh. Is it only 44 pins used on the ET4K connector/ISA slot?
Yep, only 43 unique signals from the ST side for STGA or Mega4000 type adapters!
This assumes some modifications on the ET4000 end, tying together signals that duplicate across multiple ISA pins etc.
+5V and GND will go on separate larger cables (my particular card does not need +12V or -12V)

(And looking at the VOFA schematic again it seems to only add one more signal so I should be able to implement either of these adapters on the ST side)
I already have a bunch of 44pin IDE headers so that worked out nicely :)
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agranlund
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Re: Granlunds FrankenSTein

Post by agranlund »

Icky wrote: Sat Oct 24, 2020 8:18 am
agranlund wrote: Fri Oct 23, 2020 11:59 pm I believe the Phoenix Sparkalaphobia is slightly larger than a normal blitter so I might need to move that PLCC socket somewhat to make sure the Phoenix blitter also fits.
@agranlund - have sent over the dimensions of the Phoenix Sparkalaphobia to help with placement.
Ooh, thank you! That will help for sure :)
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agranlund
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Re: Granlunds FrankenSTein

Post by agranlund »

A couple of more evenings with Eagle left but it's getting there.
stblitter.png
stblitter.png (615.12 KiB) Viewed 2899 times
So.. many.. traces.. :stars:
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exxos
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Re: Granlunds FrankenSTein

Post by exxos »

Looking good :) Traces, trying routing a motherboard or 3 :lol: :stars: :stars:
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
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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 ~
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agranlund
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Re: Granlunds FrankenSTein

Post by agranlund »

exxos wrote: Sun Oct 25, 2020 10:05 pm Looking good :) Traces, trying routing a motherboard or 3 :lol: :stars: :stars:
Haha I rather not, I have enough hatred for Eagle as it is :lol:
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Re: Granlunds FrankenSTein

Post by agranlund »

So much free space, the possibilities are endless! :lol:
Screenshot 2020-10-26 at 22.36.32.png
Screenshot 2020-10-26 at 22.36.32.png (898.68 KiB) Viewed 2847 times
Was originally planning on having an ethernet controller there, and the circuitry does fit in the space, but I'm more and more leaning toward having that completely separate and connected to the ACSI bus internally instead. That way I should be able to use the normal Ethernea drivers as-is.

Maybe an MP3 decoder IC from VLSI instead..

For now I think I'll just expose some more stuff to headers for easy experimentation/prototyping and order a couple of boards from JLCPCB.
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Re: Granlunds FrankenSTein

Post by exxos »

I did look into mp3 decoder chips a while ago. But couldn't find anything which would use external ram, they were all from SD card :(
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
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: Granlunds FrankenSTein

Post by agranlund »

exxos wrote: Tue Oct 27, 2020 9:27 am I did look into mp3 decoder chips a while ago. But couldn't find anything which would use external ram, they were all from SD card :(
VLSI has a range of chips that can be feed with a bitstream from anything :)
And they have a data-request pin that signals when the internal FIFO has at least 32bytes free.

Something like this should be good:
http://www.vlsi.fi/en/products/vs1011.html

The software side would check the status and send it some more bytes when needed.
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Re: Granlunds FrankenSTein

Post by exxos »

Oh cool. Would assume ST RAM wouikdnt be fast enough for it, or have enough RAM for it ? But paired with a 030 with 64MB RAM.. That would be pretty interesting ;)
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
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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