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Re: Sporniket's log on hardware stuff
Posted: 13 Jan 2023 13:21
by ijor
sporniket wrote: 13 Jan 2023 08:18
This week I migrated my workstation to the latest LTS Ubuntu, as a consequence
this project is now using Kicad 6.
subsheet_104-U12-GLUE.png
Great work. Thanks for sharing your work.
But note that pin 52 is
TEST, not
GND. Even when in some Atari schematics it is named as GND, and it is of course tied to GND in anycase, what matters here is the actual pin function, not the connection.
Re: Sporniket's log on hardware stuff
Posted: 13 Jan 2023 20:06
by sporniket
Thanks for the fix
@ijor, it seems that the author of "Atari ST internal" was not aware of the function of that pins.
This is the reference I used to make the symbol :
https://raw.githubusercontent.com/sporn ... ernals.pdf
edit: same with the Profibuch ST-STE-TT
edit 2 : same in the IC Pinout thread :
viewtopic.php?f=31&t=149 ; it seems
@troed posted a fix to the SMD version of the chip. Is there a public reference somewhere so that I can cite in my
source datasheet ?
Re: Sporniket's log on hardware stuff
Posted: 13 Jan 2023 21:49
by ijor
sporniket wrote: 13 Jan 2023 20:06
Thanks for the fix @ijor, it seems that the author of "Atari ST internal" was not aware of the function of that pins.
edit: same with the Profibuch ST-STE-TT
ST Internals and all other early books had no other reference but the older Atari schematics. As I said, the pin is named as GND in those
older schematics ...
Is there a public reference somewhere so that I can cite ...
Check the newer Atari schematics, like this one:
https://archive.org/details/Atari_1040S ... 1986_Atari
Anyway, trust me, I decapped the chip and I've seen the chip internal logic. The pin is not GND.
Re: Sporniket's log on hardware stuff
Posted: 14 Jan 2023 01:08
by ijor
Btw, the direction of many pins are wrong there. I'll need to check to make a detailed list, but i.e, the address bus is input only.
Re: Sporniket's log on hardware stuff
Posted: 14 Jan 2023 08:16
by sporniket
ijor wrote: 13 Jan 2023 21:49
Is there a public reference somewhere so that I can cite ...
Check the newer Atari schematics, like this one:
https://archive.org/details/Atari_1040S ... 1986_Atari
Anyway, trust me, I decapped the chip and I've seen the chip internal logic. The pin is not GND.
Thanks for the reference. And I trust you.
ijor wrote: 14 Jan 2023 01:08
Btw, the direction of many pins are wrong there. I'll need to check to make a detailed list, but i.e, the address bus is input only.
thanks in advance, I am looking forward to get your list :)
Re: Sporniket's log on hardware stuff
Posted: 20 Jan 2023 21:31
by sporniket
Some routing done.
2023-01-20--1-routing.png
Rendering from above:
2023-01-20--2-top-render.jpg
Rendering from below:
2023-01-20--2-bottom-render.jpg
For the record
@ijor , I created a github issue to track your feedbacks to fix the symbol :
https://github.com/sporniket/kicad-symb ... /issues/54
Re: Sporniket's log on hardware stuff
Posted: 21 Jan 2023 01:44
by ijor
Sorry, I forgot. Let's see ...
Code: Select all
An I
RESET I
RDY B
BERR 0
HSYNC B
VSYNC B
These are only the ones that were wrong. Hope I didn't miss anything
Re: Sporniket's log on hardware stuff
Posted: 21 Jan 2023 05:55
by sporniket
ijor wrote: 21 Jan 2023 01:44
Just to be sure, BERR is Output ? (mistyping between zero and uppercase 'o' ?)
Many thanks
@ijor
Re: Sporniket's log on hardware stuff
Posted: 21 Jan 2023 12:11
by ijor
sporniket wrote: 21 Jan 2023 05:55
Just to be sure, BERR is Output ? (mistyping between zero and uppercase 'o' ?)
That's correct.
Re: Sporniket's log on hardware stuff
Posted: 25 Jan 2023 20:43
by sporniket
Here is the fixed subsheet with the GLUE.
motherboard-U12-GLUE.png
The github is up to date.