Super turbo PCB layout | MSX Resource Center (Page 16/17)

By msxmakers

Champion (512)

03-02-2023, 00:05

Another I miss: if that design were mine it would have a label showing "superturbo version xx".

By SkalTura

Champion (399)

03-02-2023, 07:29

msxmakers wrote:

Now I understood why you left two SOT23 diode parts: the switch also needs diode.
ok, sorry for that but if you still have pcb space it would be better to have 4 diodes, I don't need more but some traditional MSX must need those diodes, at least one more spare.

There is space for a 3 pin header next to the 2 pin LED header as you can see in the previous design.
So there are 2 options I can do:
1) one diode for the IORQ, and 3 diodes for switches or other inputs.
2) one diode for the IORQ, and 2 inputs for switches or other inputs, and a ground pin.

Please let me know.

The label with "SuperTurbo v4.1" is no problem by the way...
Or just a blank square, so you can fill in the version number your self.

By msxmakers

Champion (512)

03-02-2023, 10:48

SkalTura wrote:

There is space for a 3 pin header next to the 2 pin LED header as you can see in the previous design.
So there are 2 options I can do:
1) one diode for the IORQ, and 3 diodes for switches or other inputs.
2) one diode for the IORQ, and 2 inputs for switches or other inputs, and a ground pin.

Ok, now I understand your old design and that is my choice: one diode for the IORQ and 3 diodes for 3 header pins, for use with switches or other inputs. So the GND pin will be 1 common pin on the listener.

SkalTura wrote:

By the way, the tag with "SuperTurbo v4.1" is no problem...
Or just a blank square, so you can fill in the version number yourself

I hope I didn't offend you, I was just trying to advise you. The design is yours and you should decide which version it is. My suggestion was to label the card so everyone knows which version they are working with.

By SkalTura

Champion (399)

03-02-2023, 15:03

msxmakers wrote:

I hope I didn't offend you, I was just trying to advise you.

Not offended at all, advise is always welcome

What version number is this then ?
The original circuit was called v3.0.
But since we added the Z80 as a QFP to the board is should be 4.0.
But with the changed made of your suggestion I think it's best to call it 4.1 then...?
Let me know

By SkalTura

Champion (399)

04-02-2023, 06:18

Please look at the below image my friend.
I think this covers everything you suggested...

Let me know, and I will post the Gerber files.
:D

By msxmakers

Champion (512)

04-02-2023, 16:22

SkalTura wrote:

Please look at the below image my friend.
I think this covers everything you suggested...

Let me know, and I will post the Gerber files.

Nice!
Everything is good to me now, please post the gerbers.
I will order and test it as soon as possible.
Thanks again, good job.

By SkalTura

Champion (399)

05-02-2023, 08:54

Your very welcome, love to do it...
You can find the Gerber files here: [url=https://www.hvandeven.com/MSX/TurboMSXZ80(modified)v4.1_Gerber.ZIP]Gerber files[/url]

Please send me some pictures of the PCB, and of your build when you finished it

By ahmsx

Rookie (20)

06-02-2023, 22:02

Hi,

Does the LED lit when in turbo mode (Fhigh) or in normal mode (Flow) in v4.1 of the PCB?
Just had a look at the gerber files and it seems that R7 is connected to pins 6, 11 of U2 (74HC175) instead of pins 7, 10 as in the original diagram.

Cheers.

By SkalTura

Champion (399)

07-02-2023, 08:06

ahmsx wrote:

Hi,

Does the LED lit when in turbo mode (Fhigh) or in normal mode (Flow) in v4.1 of the PCB?
Just had a look at the gerber files and it seems that R7 is connected to pins 6, 11 of U2 (74HC175) instead of pins 7, 10 as in the original diagram.

Cheers.

Oops... Small design fault.
But then this was also the case for the other design, and no one noticed this before...?

By msxmakers

Champion (512)

08-02-2023, 03:04

SkalTura wrote:

Oops... Small design fault.
But then this was also the case for the other design, and no one noticed this before...?

Hello,
It is true that the error exists.
It seems the only fault is that when the turbo is off the light is on steadily and when the turbo is on the light flashes.
If that's all it's not a very serious problem.