Who would be interested in a blank pcb for Georg Braun's new A1000 system (GB A1000)

[amigadave]

Everblue wrote:
Not interested in a blank to be honest, but a fully populated one, even more if its in ATX form.

In ATX form???  What is the point of getting an A3000 like spec Amiga  mobo that was developed to fit in the original A1000 case and redesign it to fit in an ATX case?  If you are going to redesign it to fit the ATX case, you might as well also redesign it to use an 060 and/or G3/G4!

I don't get it?

[Everblue]

I dont have an A1000 and rather than try to find a yellowed A1000 case on ebay, I would rather buy a cheap case from the PC store across the road and put it in it.

[motorollin]

amigadave wrote:
you might as well also redesign it to use an 060 and/or G3/G4!

Yeah! Do that!
:-D

--
moto

[mingle]

I'd give it a bash if I could get a board landed in Melbourne, Australia for around $100...

I'm no expert solder by any means, but it looks like it's mostly 'thru-hole' components, so it shouldn't be too hard...

Might be tricky to get my hands on the custom chips though!

Cheers,

Mike.

[whiteb]

mingle wrote:
I'd give it a bash if I could get a board landed in Melbourne, Australia for around $100...

I'm no expert solder by any means, but it looks like it's mostly 'thru-hole' components, so it shouldn't be too hard...

Might be tricky to get my hands on the custom chips though!

Cheers,

Mike.

Yes, MOST of it looks through hole, but remember, this is Through hole on a MULTI layer board.  You have to make sure that you solder *ALL* layers.

The only Surface Mount devices, look like the 16 * Ram (?) chips, but they look similar to minimig's Ram, and they are *EASY* to do, maybe a few Surface Mount Caps/Resistors as well.

[whiteb]

Kristian95 wrote:
I checked out this place: http://www.pcbfabrication.com and the prices are pretty good!
If I figured it out correctly (I am quite sure I did!) the price for 1 board is:

1 board: us$ 360 per board
5 boards: us$ 168 per board
10 boards us$ 106 per board

Does anyone have any experience with this company? Also I'd prefer if someone who knows these things inside out can help check out I did get the right quotation...
Here is what I filled in:

4 layer board
Single board with 1 board per panel
board length: 317 mm
board width: 342 mm
peelable soldermask: both sides
solder mask: 2 sides (blue board)
silkscreen: 2 sides (white)
minimum trace/space: 9-10 mil
minimum hole size: 17-18 mil
electrical test: yes
material: Fr4
board thickness: 1.6 mm
finished copper weight: 35um for top, inside and bottom layers
board finish: hot air solder leveled
stencil: none
blind via hole: no
controlled impedance: no
buried via hole: no
controlled dielectric: no

Please, please let me know if these are all the correct settings... I am only sure about the dimensions and material.

You are using Edge connector's on the board (If you get as far as the Expansions), the hot Air Solder leveled tends to shred up pretty quickly with use on Edge Connectors.

Going for something more.... "Versatile" will add cost to the board.

[mingle]

Ah! A minor problem! :-)

I've no desire to end up with a $100 A1000 MB-shaped paperweight!

Maybe if I can get one soldered-up for around $300 and I'd go for it..

Cheers,

Mike.

[Kristian95]

@whiteb:

Which of the following would you suggest:

HASL - Hot Air Solder Leveled
RoHS Lead Free HASL  
RoHS ENIG - Electroless Nickel Immersion Gold / Soft Gold
RoHS Immersion Tin
RoHS Bare Copper
RoHS OSP - Organic Solderability Preservatives
RoHS Electroplating Gold / Hard Gold

[whiteb]

Well, HASL is not ROHS compliant.

Minimum I'd go for ROHS Lead Free HASL, or nickel Immersion gold.

[jkonstan]

The old Amiga custom ICs are not lead free and never will be; thus, you could just use the less expensive HASL - Hot Air Solder Leveled. Another pretty good choice that I did not see on the list would be silver Immersion. Because once the copper is exposed to air it will Oxidize causing the PCB to become difficult to solder, do not use Bare Copper and do not use OSP - Organic Solderability Preservatives.



 :-)

[amigadave]

I have a source that can recreate new A1000 cases, but don't know the price yet.  Who wants one?

[amigadave]

countzero wrote:
if it's 106$ per board I'm in too... but you should find a place which will provide and program other programmable chips, the PALs/GALs and there's a lattice chip in there too I guess ...

There is a member of this site that programs chip replacements for the A3000 that I think can possibly help out.  I will have to look back and see who it was.

[Plaz]

I have a source that can recreate new A1000 cases

If they can do other small cases at a good price, I have another amiga related project that would need a case. Let us know what you find out.

Plaz

[persia]

I'd rather see a µATX format.  There's no reason for a big motherboard...

[Hodgkinson]

RoHS *Shudder* - Well, that is at least with respect to the solder. Bah. Awful stuff. It’s bad enough to flow onto the pins of a TIP120 in mid air, never mind soldering SMD's  or through-hole via multiple PCB levels.

I've heard of people build kits (HF Transceivers, btw) with leaded solder and lead-free solder before, the one which used leaded solder got his kit to work first time. The one who used lead-free had at least two bad joints and he's still tracing faults, as far as I’m aware...

Anyway, that’s just my tip for anyone who does build one...
(Heh, time to return to the topic... :-D )
Hodgkinson.

EDIT: Déjà vu, I wonder if this project might follow the same course as the Minimig...

[amigadave]

persia wrote:
I'd rather see a µATX format.  There's no reason for a big motherboard...

Unless you happen to like the Retro look, liked the original case design of the A1000 and don't want to wait 6 months to 3 years for someone to redesign the mobo to fit in the case size of your choice.

We have the A1000 design NOW, we have the files to reproduce it, the parts (although not so easy to come by) are available, so the project is viable if you already have the case, or I can have a new one produced at a reasonable cost.

Anything else is a different project and it is encouraging that there are still people interested in doing new projects based on the 20 year old Amiga technology.  Hobbies are fun.