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Rickard5

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Joined: 31/03/2022
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Posted: 08:00am 13 Apr 2022

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I've got a couple of these Raspberry Pi GPIO Breadboard Breakout boards around, and it would be neat to use them with the 2x20 port on the PM VGA. Has anyone rang them out? Is there a Chart or diagram to show the pin out of one of these Pi T-Cobblers with?

I may be Vulgar, but , while I'm poor, I'm Industrious, Honest, and trustworthy! I Know my Place

thwill

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Joined: 16/09/2019
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Posted: 10:05am 13 Apr 2022

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Hi Rickard,

This is hardware so my standard line is "I know nothing", but the cobbler I've got has all the GND pins tied together and I don't believe these match up with the GND pins on the PicoMite 2x20 port - though I actually can't recall seeing a diagram of the latter yet.

Best wishes,

Tom

MMBasic for Linux, Game*Mite, CMM2 Welcome Tape, Creaky old text adventures

Mixtel90

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Posted: 12:23pm 13 Apr 2022

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I think the problem was that ifyou connect them using a standard cable everything is messed up because the CMM2 port was "upside down". The answer was to file off the "bump" on the CMM2 end of the cable so that it could be inserted upside down.

NOTE: This has been done, as has making a special cable, but I would advise checking back through the forum and doing some careful examination rather than just taking my word for it! :)

I'm not aware of these being used with the MicoMite VGA specifically.

Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs

Rickard5

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Posted: 08:55pm 13 Apr 2022

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Mixtel90 said I think the problem was that ifyou connect them using a standard cable everything is messed up because the CMM2 port was "upside down". The answer was to file off the "bump" on the CMM2 end of the cable so that it could be inserted upside down.

NOTE: This has been done, as has making a special cable, but I would advise checking back through the forum and doing some careful examination rather than just taking my word for it! :)

I'm not aware of these being used with the MicoMite VGA specifically.

Mick I'm trying to use this with a Picomite VGA 1.3 board, When my dear Precious CMM2 gets here no way am I touching any expansion port on such a rare beast that plays Gauntlet and hopefully soon Wolf3D and Doom :) With the pico worst things I can do is blow up a $2 Pico and I got 50 of them and next time Microcenter has them I'll buy all they'll let me with the rainchecks I accumulated while they were on sale :)

I may be Vulgar, but , while I'm poor, I'm Industrious, Honest, and trustworthy! I Know my Place

TassyJim

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Joined: 07/08/2011
Location: Australia
Posts: 6283

Posted: 09:12pm 13 Apr 2022

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CMM2 G2 has the pinout orientation to suit the RPi breakout correct.
On the CMM2 G1 the standard layout has the pin orientation reversed and requires a simple mod to either the breakout cable or the CMM2 shroud.

If you have anything other than the official board design, you will need to check.

With the pico board, as long as pin1 ends up towards the led and SDcard, all should be well.

VK7JH
MMedit

Mixtel90

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Posted: 09:12pm 13 Apr 2022

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I don't know the 1.3 board, but IIRC Peter designed it so that 2x20 stuff intended for the CMM2 could be plugged into it - it might not have worked, but no damage would result. You'd have to do some research to ensure that this is correct, unless someone else knows?

Although I have a CMM2, I haven't got a 1.3 board to compare.

EDIT:
Thanks Jim. :)
Edited 2022-04-14 07:13 by Mixtel90

Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs

TassyJim

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Posted: 10:41pm 13 Apr 2022

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Looking at the gerbers for V1.4 (I think), it doesn't look the same as the CMM2 pinout so you will have to check things first.
It is easy enough to check for %V on the two adjacent pins and 3.3 on the first pin on the opposite side.

Sorry about the misdirection earlier.

Jim

VK7JH
MMedit

Quazee137

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Joined: 07/08/2016
Location: United States
Posts: 593

Posted: 09:56am 14 Apr 2022

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Here is what I have been playing with.

Waveshare Pico To Hat, PiFace, MDFLY Breakout Board, PHAT STACK and

my CMM2 Port Explorer.

I have the RPi 3.2" and 4" Displays coming back from MM170 units out in the field.

working on changing all my MM170 designs to Pico.

Having FUN
Quazee137
Edited 2022-04-14 20:02 by Quazee137

Rickard5

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Posts: 463

Posted: 01:00pm 14 Apr 2022

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Very cool Quazee137

I may be Vulgar, but , while I'm poor, I'm Industrious, Honest, and trustworthy! I Know my Place

Volhout
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Joined: 05/03/2018
Location: Netherlands
Posts: 5089

Posted: 01:17pm 14 Apr 2022

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Quazee,

The CMM2 expander is very nice.... Didn't even know this existed.
If I where around that time(Aug 2020), I would have wanted one...

Volhout

PicomiteVGA PETSCII ROBOTS

Quazee137

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Joined: 07/08/2016
Location: United States
Posts: 593

Posted: 05:27pm 14 Apr 2022

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Volhot here is the post from back then.
Port Explorer

I have more boards the kits sold out.

PM me your mailing info and I'll send one.

Quazee137

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