Granlunds FrankenSTein

Blogs & guides and tales of woo by forum members.
User avatar
Icky
Moderator
Moderator
Posts: 2584
Joined: Sun Sep 03, 2017 10:57 am
Location: UK
YouTube: https://tinyurl.com/yals4a3k
Contact:

Re: Granlunds FrankenSTein

Post by Icky » 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.

User avatar
agranlund
Posts: 431
Joined: Sun Aug 18, 2019 10:43 pm
Location: Sweden
Contact:

Re: Granlunds FrankenSTein

Post by agranlund » Sat Oct 24, 2020 11:37 am

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 :)

User avatar
agranlund
Posts: 431
Joined: Sun Aug 18, 2019 10:43 pm
Location: Sweden
Contact:

Re: Granlunds FrankenSTein

Post by agranlund » Sat Oct 24, 2020 11:38 am

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 :)

User avatar
agranlund
Posts: 431
Joined: Sun Aug 18, 2019 10:43 pm
Location: Sweden
Contact:

Re: Granlunds FrankenSTein

Post by agranlund » Sun Oct 25, 2020 9:55 pm

A couple of more evenings with Eagle left but it's getting there.
stblitter.png
stblitter.png (615.12 KiB) Viewed 522 times
So.. many.. traces.. :stars:

User avatar
exxos
Site Admin
Site Admin
Posts: 12558
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
YouTube: https://www.youtube.com/user/exxosuk
Contact:

Re: Granlunds FrankenSTein

Post by exxos » Sun Oct 25, 2020 10:05 pm

Looking good :) Traces, trying routing a motherboard or 3 :lol: :stars: :stars:
https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.

User avatar
agranlund
Posts: 431
Joined: Sun Aug 18, 2019 10:43 pm
Location: Sweden
Contact:

Re: Granlunds FrankenSTein

Post by agranlund » Sun Oct 25, 2020 10:11 pm

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:

User avatar
agranlund
Posts: 431
Joined: Sun Aug 18, 2019 10:43 pm
Location: Sweden
Contact:

Re: Granlunds FrankenSTein

Post by agranlund » Tue Oct 27, 2020 9:18 am

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 470 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.

User avatar
exxos
Site Admin
Site Admin
Posts: 12558
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
YouTube: https://www.youtube.com/user/exxosuk
Contact:

Re: Granlunds FrankenSTein

Post by exxos » 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 :(
https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.

User avatar
agranlund
Posts: 431
Joined: Sun Aug 18, 2019 10:43 pm
Location: Sweden
Contact:

Re: Granlunds FrankenSTein

Post by agranlund » Tue Oct 27, 2020 9:38 am

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.

User avatar
exxos
Site Admin
Site Admin
Posts: 12558
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
YouTube: https://www.youtube.com/user/exxosuk
Contact:

Re: Granlunds FrankenSTein

Post by exxos » Tue Oct 27, 2020 9:46 am

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.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.

Post Reply

Return to “MEMBER BLOGS”