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Rickard5

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Joined: 31/03/2022
Location: United States
Posts: 463

Posted: 06:44am 10 Jul 2023

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Before I had to Take some time away, one of the projects I was Deeply obsessed with was the Picomite Pear, I had a couple of them built, but there was a power issue that required some rewiring on the V1 boards, I lost the notes on that. Does any one happen to have notes on rewiring the LM1117 ?

has there been any Forward Progress on the Pear?

Thank you everyone for any info, I'm looking forward to doing some new building projects

Rick

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

Mixtel90

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Joined: 05/10/2019
Location: United Kingdom
Posts: 6798

Posted: 06:50am 10 Jul 2023

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I've not done anything else with it. IIRC two connections were reversed. I'll see if I can find the info today. It's on here somewhere anyway. :)

Welcome back. :)

Version 0.2 of the PCB is correct and needs no changes.
Prior versions are screwed up. You have choices:
1) mount the reg off-board
2) extend its leads so that you can twist them into the right places
3) Change the reg to type LF33 and mount it on the bottom of the board
4) Throw the board away and get some version 0.2 ones. :)

EDIT

It looks like I never published the updated Gerbers. I've removed the PicoMite Pear construction pack from Dropbox for the moment. I'll get things fixed today, all being well.

If you want to hack an existing board the current L-R connections on the PCB are
IN GND OUT

For a LM1117T they should be
IN OUT GND

Basically, the RH and middle connections are reversed but you can't chop tracks to fix it as the middle hole is a ground plane.

The best way is, with the reg in front of you, bend the LH leg away from you and the middle and RH legs towards you. Fit it to the board. Connect an insulated wire from the middle pin to the RH hole. Connect a wire from the RH pin to the bottom connection of C2 or to the middle hole.
Edited 2023-07-10 17:28 by Mixtel90

Mick

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

Rickard5

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Joined: 31/03/2022
Location: United States
Posts: 463

Posted: 08:19pm 10 Jul 2023

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Thank y9u MIXTEL I'm so excited to get back in to this Project and see how to SCALE it UP to MORE Picos. I know I'm STOOPID, but it would be so cool to build a Pico with more Horse Power than Cray :) running MMBasic :)

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

DaveJacko
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Joined: 25/07/2019
Location: United Kingdom
Posts: 76

Posted: 09:46pm 10 Jul 2023

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Just glad you're back, hope I speak for everyone, you cheer us up!

Rickard5

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Joined: 31/03/2022
Location: United States
Posts: 463

Posted: 02:24am 11 Jul 2023

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DaveJacko said Just glad you're back, hope I speak for everyone, you cheer us up!

Thanks Dave, I pray I never offend the UK and EU crowd, we have very different sense of Humor and Sensibility in Texas , but you English have better Television

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: 4247

Posted: 04:07am 11 Jul 2023

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Rickard,

Power up your CMM2, it has more horsepower than 3 pico's. And more memory than a cray-1...

Volhout
Edited 2023-07-11 14:09 by Volhout

PicomiteVGA PETSCII ROBOTS

Mixtel90

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Joined: 05/10/2019
Location: United Kingdom
Posts: 6798

Posted: 06:49am 11 Jul 2023

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Peter never did complete the port of MMBasic to the Cray-1. Probably ran out of RAM.

Mick

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

Volhout
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Joined: 05/03/2018
Location: Netherlands
Posts: 4247

Posted: 08:43pm 11 Jul 2023

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The cray1 might have been equiped with a IBM 2250 graphics terminal, costing 214000 dollar, resolution 1024x1024 bit mapped graphics. Or a Tektronics 4014 vector display.

Nice to read about these 1970's computer stuff. That is far before the Apple 1 came to the stage.

Computer must have been science at that time. Everything was floating point calculations.

Now it is engineering, bytes and bits...
Edited 2023-07-12 06:45 by Volhout

PicomiteVGA PETSCII ROBOTS

Mixtel90

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Joined: 05/10/2019
Location: United Kingdom
Posts: 6798

Posted: 09:54pm 11 Jul 2023

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Analogue computers were interesting. I made a simple one, based on a Whetstone Bridge, for a school science project.

Mick

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

Rickard5

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Joined: 31/03/2022
Location: United States
Posts: 463

Posted: 02:19am 12 Jul 2023

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Volhout said Rickard,

Power up your CMM2, it has more horsepower than 3 pico's. And more memory than a cray-1...

Volhout

I Love LOVE MY CMM2 , AND PLAY WITH IT OFTEN. But I don't dare mess with the I/O, and the Idea of building a Working 1/10 scale Cray that out performs the original for less than the Price of the the BAD Date I went on last weekend, Just Amuses me and makes me smile

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

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