Sporniket's log on hardware stuff

[ijor]

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.

[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 ?

[ijor]

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.

[ijor]

my source datasheet ?

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.

[sporniket]

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.

my source datasheet ?

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 :)

[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

[ijor]

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

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

[sporniket]

Code: Select all

BERR     0

Just to be sure, BERR is Output ? (mistyping between zero and uppercase 'o' ?)

Many thanks @ijor

[ijor]

Just to be sure, BERR is Output ? (mistyping between zero and uppercase 'o' ?)

That's correct.

[sporniket]

Here is the fixed subsheet with the GLUE.

motherboard-U12-GLUE.png

The github is up to date.