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M102 mainboard (PCB)

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  M102 mainboard (PCB) lowrezz@gmail.com - 2019-08-22 20:00 -0700
    Re: M102 mainboard (PCB) Josh Malone <josh.malone@gmail.com> - 2019-08-23 10:31 -0700
      Re: M102 mainboard (PCB) lowrezz@gmail.com - 2019-08-27 12:00 -0700
        Re: M102 mainboard (PCB) Daniel <me@sci.fidan.com> - 2020-06-18 23:38 -0700
        Re: M102 mainboard (PCB) Daniel <me@sc1f1dan.com> - 2023-02-03 07:27 +0000
    Re: M102 mainboard (PCB) Daniel <me@scifida.n.com> - 2020-03-30 23:59 -0700
      Re: M102 mainboard (PCB) lowrezz@gmail.com - 2020-06-18 05:29 -0700
        Re: M102 mainboard (PCB) Daniel <me@sci.fidan.com> - 2020-06-18 23:41 -0700

#528 — M102 mainboard (PCB)

Has anyone ever duplicated the mainboard of the
 TRS80 Model 102?

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#529

On Thursday, August 22, 2019 at 11:00:56 PM UTC-4, low...@gmail.com wrote:
> Has anyone ever duplicated the mainboard of the
>  TRS80 Model 102?

Not to my knowledge, although the though has occurred to me a time or two. It would be nice to have a drop-in replacement board with modern power-supply features and one that takes JEDEC-standard ROMs.

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#530

I ask because I have a T102 where the mainboard 
 looks a little fried and corroded. Assembly of a new
Board would be a nice backup should my repair 
attempts fail. 

If I knew how, I'd build a new board with a Z80
on board. I know there's Pi based retrofits out there, 
but, no thanks. 

OTOH, if this 102 board is fried, maybe a tear down 
and scan would be better than parting out the rest
of the chassis and case. 

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#549

lowrezz@gmail.com writes:

> I ask because I have a T102 where the mainboard 
>  looks a little fried and corroded. Assembly of a new
> Board would be a nice backup should my repair 
> attempts fail. 
>
> If I knew how, I'd build a new board with a Z80
> on board. I know there's Pi based retrofits out there, 
> but, no thanks. 
>
> OTOH, if this 102 board is fried, maybe a tear down 
> and scan would be better than parting out the rest
> of the chassis and case. 

Somebody did this for the C64 and all the board variants. It is possible
to do. But changing teh CPU to a Z80 sounds like it would no longer be a 102.

-- 
Daniel
Visit me at: gopher://gcpp.world

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#644

lowrezz@gmail.com writes:

> I ask because I have a T102 where the mainboard 
>  looks a little fried and corroded. Assembly of a new
> Board would be a nice backup should my repair 
> attempts fail. 
>
> If I knew how, I'd build a new board with a Z80
> on board. I know there's Pi based retrofits out there, 
> but, no thanks. 
>
> OTOH, if this 102 board is fried, maybe a tear down 
> and scan would be better than parting out the rest
> of the chassis and case. 

I may just do it. I have a working 102 and one that works sans some bad
lines on display due to a bad display driver chip. It is fixable if I
can find a spare chip for sale as a drop-in replacement. I don't want to
sacrifice it if it is largely fixable.

I've been looking for a dead one on ebay for less than $20 but people
want crazy money for even a dead one. If I can get my hands on a dead
100, 102 then I'll get started reverse engineering the board in CAD and
see how it goes.

I may ask the bitchin crew if someone has a dead 100 they're willing to
donate.

Daniel

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#544

On 8/22/19 8:00 PM, lowrezz@gmail.com wrote:
> Has anyone ever duplicated the mainboard of the
>   TRS80 Model 102?

If any engineers out there were to create a modern one with the same 
form factor and with off-the-shelf components running basic, has wifi 
capability, and a (ideally backlit) display capable of >300 baud, I'd 
contribute to a kickstarter.

Are all you members of the bitchin100 listserv?

-- 
Daniel

Visit me at: gopher://gcpp.world

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#548

Yes I am. 

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#550

lowrezz@gmail.com writes:

> Yes I am. 

I started this very conversation about doing a fresh board project and
got almost no support for it. birt and others agreed that there are
copious systems out there that can be used for parts.

Another user I am communicating with is actually building hardware.
We've discussed it at length because he has a few 102's that have
absolutely wrecked motherboards and need a replacement.

He's been using them for chip replacements.

I have a 100 currently needing a replacement 44102 to fix the display output.

-- 
Daniel

Visit me at: gopher://gcpp.world

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